hotspot/src/cpu/x86/vm/templateTable_x86_64.cpp - edge/openjdk - Git at Google

 /*
  * Copyright (c) 2003, 2016, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */

 #include "precompiled.hpp"
 #include "asm/macroAssembler.hpp"
 #include "interpreter/interpreter.hpp"
 #include "interpreter/interpreterRuntime.hpp"
 #include "interpreter/templateTable.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/methodData.hpp"
 #include "oops/objArrayKlass.hpp"
 #include "oops/oop.inline.hpp"
 #include "prims/methodHandles.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/stubRoutines.hpp"
 #include "runtime/synchronizer.hpp"
 #include "utilities/macros.hpp"

 #ifndef CC_INTERP

 #define __ _masm->

 // Platform-dependent initialization

 void TemplateTable::pd_initialize() {
   // No amd64 specific initialization
 }

 // Address computation: local variables

 static inline Address iaddress(int n) {
   return Address(r14, Interpreter::local_offset_in_bytes(n));
 }

 static inline Address laddress(int n) {
   return iaddress(n + 1);
 }

 static inline Address faddress(int n) {
   return iaddress(n);
 }

 static inline Address daddress(int n) {
   return laddress(n);
 }

 static inline Address aaddress(int n) {
   return iaddress(n);
 }

 static inline Address iaddress(Register r) {
   return Address(r14, r, Address::times_8);
 }

 static inline Address laddress(Register r) {
   return Address(r14, r, Address::times_8, Interpreter::local_offset_in_bytes(1));
 }

 static inline Address faddress(Register r) {
   return iaddress(r);
 }

 static inline Address daddress(Register r) {
   return laddress(r);
 }

 static inline Address aaddress(Register r) {
   return iaddress(r);
 }

 static inline Address at_rsp() {
   return Address(rsp, 0);
 }

 // At top of Java expression stack which may be different than esp().  It
 // isn't for category 1 objects.
 static inline Address at_tos   () {
   return Address(rsp,  Interpreter::expr_offset_in_bytes(0));
 }

 static inline Address at_tos_p1() {
   return Address(rsp,  Interpreter::expr_offset_in_bytes(1));
 }

 static inline Address at_tos_p2() {
   return Address(rsp,  Interpreter::expr_offset_in_bytes(2));
 }

 static inline Address at_tos_p3() {
   return Address(rsp,  Interpreter::expr_offset_in_bytes(3));
 }

 // Condition conversion
 static Assembler::Condition j_not(TemplateTable::Condition cc) {
   switch (cc) {
   case TemplateTable::equal        : return Assembler::notEqual;
   case TemplateTable::not_equal    : return Assembler::equal;
   case TemplateTable::less         : return Assembler::greaterEqual;
   case TemplateTable::less_equal   : return Assembler::greater;
   case TemplateTable::greater      : return Assembler::lessEqual;
   case TemplateTable::greater_equal: return Assembler::less;
   }
   ShouldNotReachHere();
   return Assembler::zero;
 }


 // Miscelaneous helper routines
 // Store an oop (or NULL) at the address described by obj.
 // If val == noreg this means store a NULL

 static void do_oop_store(InterpreterMacroAssembler* _masm,
                          Address obj,
                          Register val,
                          BarrierSet::Name barrier,
                          bool precise) {
   assert(val == noreg || val == rax, "parameter is just for looks");
   switch (barrier) {
 #if INCLUDE_ALL_GCS
     case BarrierSet::G1SATBCT:
     case BarrierSet::G1SATBCTLogging:
       {
         // flatten object address if needed
         if (obj.index() == noreg && obj.disp() == 0) {
           if (obj.base() != rdx) {
             __ movq(rdx, obj.base());
           }
         } else {
           __ leaq(rdx, obj);
         }
         __ g1_write_barrier_pre(rdx /* obj */,
                                 rbx /* pre_val */,
                                 r15_thread /* thread */,
                                 r8  /* tmp */,
                                 val != noreg /* tosca_live */,
                                 false /* expand_call */);
         if (val == noreg) {
           __ store_heap_oop_null(Address(rdx, 0));
         } else {
           // G1 barrier needs uncompressed oop for region cross check.
           Register new_val = val;
           if (UseCompressedOops) {
             new_val = rbx;
             __ movptr(new_val, val);
           }
           __ store_heap_oop(Address(rdx, 0), val);
           __ g1_write_barrier_post(rdx /* store_adr */,
                                    new_val /* new_val */,
                                    r15_thread /* thread */,
                                    r8 /* tmp */,
                                    rbx /* tmp2 */);
         }
       }
       break;
 #endif // INCLUDE_ALL_GCS
     case BarrierSet::CardTableModRef:
     case BarrierSet::CardTableExtension:
       {
         if (val == noreg) {
           __ store_heap_oop_null(obj);
         } else {
           __ store_heap_oop(obj, val);
           // flatten object address if needed
           if (!precise || (obj.index() == noreg && obj.disp() == 0)) {
             __ store_check(obj.base());
           } else {
             __ leaq(rdx, obj);
             __ store_check(rdx);
           }
         }
       }
       break;
     case BarrierSet::ModRef:
     case BarrierSet::Other:
       if (val == noreg) {
         __ store_heap_oop_null(obj);
       } else {
         __ store_heap_oop(obj, val);
       }
       break;
     default      :
       ShouldNotReachHere();

   }
 }

 Address TemplateTable::at_bcp(int offset) {
   assert(_desc->uses_bcp(), "inconsistent uses_bcp information");
   return Address(r13, offset);
 }

 void TemplateTable::patch_bytecode(Bytecodes::Code bc, Register bc_reg,
                                    Register temp_reg, bool load_bc_into_bc_reg/*=true*/,
                                    int byte_no) {
   if (!RewriteBytecodes)  return;
   Label L_patch_done;

   switch (bc) {
   case Bytecodes::_fast_aputfield:
   case Bytecodes::_fast_bputfield:
   case Bytecodes::_fast_zputfield:
   case Bytecodes::_fast_cputfield:
   case Bytecodes::_fast_dputfield:
   case Bytecodes::_fast_fputfield:
   case Bytecodes::_fast_iputfield:
   case Bytecodes::_fast_lputfield:
   case Bytecodes::_fast_sputfield:
     {
       // We skip bytecode quickening for putfield instructions when
       // the put_code written to the constant pool cache is zero.
       // This is required so that every execution of this instruction
       // calls out to InterpreterRuntime::resolve_get_put to do
       // additional, required work.
       assert(byte_no == f1_byte || byte_no == f2_byte, "byte_no out of range");
       assert(load_bc_into_bc_reg, "we use bc_reg as temp");
       __ get_cache_and_index_and_bytecode_at_bcp(temp_reg, bc_reg, temp_reg, byte_no, 1);
       __ movl(bc_reg, bc);
       __ cmpl(temp_reg, (int) 0);
       __ jcc(Assembler::zero, L_patch_done);  // don't patch
     }
     break;
   default:
     assert(byte_no == -1, "sanity");
     // the pair bytecodes have already done the load.
     if (load_bc_into_bc_reg) {
       __ movl(bc_reg, bc);
     }
   }

   if (JvmtiExport::can_post_breakpoint()) {
     Label L_fast_patch;
     // if a breakpoint is present we can't rewrite the stream directly
     __ movzbl(temp_reg, at_bcp(0));
     __ cmpl(temp_reg, Bytecodes::_breakpoint);
     __ jcc(Assembler::notEqual, L_fast_patch);
     __ get_method(temp_reg);
     // Let breakpoint table handling rewrite to quicker bytecode
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::set_original_bytecode_at), temp_reg, r13, bc_reg);
 #ifndef ASSERT
     __ jmpb(L_patch_done);
 #else
     __ jmp(L_patch_done);
 #endif
     __ bind(L_fast_patch);
   }

 #ifdef ASSERT
   Label L_okay;
   __ load_unsigned_byte(temp_reg, at_bcp(0));
   __ cmpl(temp_reg, (int) Bytecodes::java_code(bc));
   __ jcc(Assembler::equal, L_okay);
   __ cmpl(temp_reg, bc_reg);
   __ jcc(Assembler::equal, L_okay);
   __ stop("patching the wrong bytecode");
   __ bind(L_okay);
 #endif

   // patch bytecode
   __ movb(at_bcp(0), bc_reg);
   __ bind(L_patch_done);
 }


 // Individual instructions

 void TemplateTable::nop() {
   transition(vtos, vtos);
   // nothing to do
 }

 void TemplateTable::shouldnotreachhere() {
   transition(vtos, vtos);
   __ stop("shouldnotreachhere bytecode");
 }

 void TemplateTable::aconst_null() {
   transition(vtos, atos);
   __ xorl(rax, rax);
 }

 void TemplateTable::iconst(int value) {
   transition(vtos, itos);
   if (value == 0) {
     __ xorl(rax, rax);
   } else {
     __ movl(rax, value);
   }
 }

 void TemplateTable::lconst(int value) {
   transition(vtos, ltos);
   if (value == 0) {
     __ xorl(rax, rax);
   } else {
     __ movl(rax, value);
   }
 }

 void TemplateTable::fconst(int value) {
   transition(vtos, ftos);
   static float one = 1.0f, two = 2.0f;
   switch (value) {
   case 0:
     __ xorps(xmm0, xmm0);
     break;
   case 1:
     __ movflt(xmm0, ExternalAddress((address) &one));
     break;
   case 2:
     __ movflt(xmm0, ExternalAddress((address) &two));
     break;
   default:
     ShouldNotReachHere();
     break;
   }
 }

 void TemplateTable::dconst(int value) {
   transition(vtos, dtos);
   static double one = 1.0;
   switch (value) {
   case 0:
     __ xorpd(xmm0, xmm0);
     break;
   case 1:
     __ movdbl(xmm0, ExternalAddress((address) &one));
     break;
   default:
     ShouldNotReachHere();
     break;
   }
 }

 void TemplateTable::bipush() {
   transition(vtos, itos);
   __ load_signed_byte(rax, at_bcp(1));
 }

 void TemplateTable::sipush() {
   transition(vtos, itos);
   __ load_unsigned_short(rax, at_bcp(1));
   __ bswapl(rax);
   __ sarl(rax, 16);
 }

 void TemplateTable::ldc(bool wide) {
   transition(vtos, vtos);
   Label call_ldc, notFloat, notClass, Done;

   if (wide) {
     __ get_unsigned_2_byte_index_at_bcp(rbx, 1);
   } else {
     __ load_unsigned_byte(rbx, at_bcp(1));
   }

   __ get_cpool_and_tags(rcx, rax);
   const int base_offset = ConstantPool::header_size() * wordSize;
   const int tags_offset = Array<u1>::base_offset_in_bytes();

   // get type
   __ movzbl(rdx, Address(rax, rbx, Address::times_1, tags_offset));

   // unresolved class - get the resolved class
   __ cmpl(rdx, JVM_CONSTANT_UnresolvedClass);
   __ jccb(Assembler::equal, call_ldc);

   // unresolved class in error state - call into runtime to throw the error
   // from the first resolution attempt
   __ cmpl(rdx, JVM_CONSTANT_UnresolvedClassInError);
   __ jccb(Assembler::equal, call_ldc);

   // resolved class - need to call vm to get java mirror of the class
   __ cmpl(rdx, JVM_CONSTANT_Class);
   __ jcc(Assembler::notEqual, notClass);

   __ bind(call_ldc);
   __ movl(c_rarg1, wide);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::ldc), c_rarg1);
   __ push_ptr(rax);
   __ verify_oop(rax);
   __ jmp(Done);

   __ bind(notClass);
   __ cmpl(rdx, JVM_CONSTANT_Float);
   __ jccb(Assembler::notEqual, notFloat);
   // ftos
   __ movflt(xmm0, Address(rcx, rbx, Address::times_8, base_offset));
   __ push_f();
   __ jmp(Done);

   __ bind(notFloat);
 #ifdef ASSERT
   {
     Label L;
     __ cmpl(rdx, JVM_CONSTANT_Integer);
     __ jcc(Assembler::equal, L);
     // String and Object are rewritten to fast_aldc
     __ stop("unexpected tag type in ldc");
     __ bind(L);
   }
 #endif
   // itos JVM_CONSTANT_Integer only
   __ movl(rax, Address(rcx, rbx, Address::times_8, base_offset));
   __ push_i(rax);
   __ bind(Done);
 }

 // Fast path for caching oop constants.
 void TemplateTable::fast_aldc(bool wide) {
   transition(vtos, atos);

   Register result = rax;
   Register tmp = rdx;
   int index_size = wide ? sizeof(u2) : sizeof(u1);

   Label resolved;

   // We are resolved if the resolved reference cache entry contains a
   // non-null object (String, MethodType, etc.)
   assert_different_registers(result, tmp);
   __ get_cache_index_at_bcp(tmp, 1, index_size);
   __ load_resolved_reference_at_index(result, tmp);
   __ testl(result, result);
   __ jcc(Assembler::notZero, resolved);

   address entry = CAST_FROM_FN_PTR(address, InterpreterRuntime::resolve_ldc);

   // first time invocation - must resolve first
   __ movl(tmp, (int)bytecode());
   __ call_VM(result, entry, tmp);

   __ bind(resolved);

   if (VerifyOops) {
     __ verify_oop(result);
   }
 }

 void TemplateTable::ldc2_w() {
   transition(vtos, vtos);
   Label Long, Done;
   __ get_unsigned_2_byte_index_at_bcp(rbx, 1);

   __ get_cpool_and_tags(rcx, rax);
   const int base_offset = ConstantPool::header_size() * wordSize;
   const int tags_offset = Array<u1>::base_offset_in_bytes();

   // get type
   __ cmpb(Address(rax, rbx, Address::times_1, tags_offset),
           JVM_CONSTANT_Double);
   __ jccb(Assembler::notEqual, Long);
   // dtos
   __ movdbl(xmm0, Address(rcx, rbx, Address::times_8, base_offset));
   __ push_d();
   __ jmpb(Done);

   __ bind(Long);
   // ltos
   __ movq(rax, Address(rcx, rbx, Address::times_8, base_offset));
   __ push_l();

   __ bind(Done);
 }

 void TemplateTable::locals_index(Register reg, int offset) {
   __ load_unsigned_byte(reg, at_bcp(offset));
   __ negptr(reg);
 }

 void TemplateTable::iload() {
   transition(vtos, itos);
   if (RewriteFrequentPairs) {
     Label rewrite, done;
     const Register bc = c_rarg3;
     assert(rbx != bc, "register damaged");

     // get next byte
     __ load_unsigned_byte(rbx,
                           at_bcp(Bytecodes::length_for(Bytecodes::_iload)));
     // if _iload, wait to rewrite to iload2.  We only want to rewrite the
     // last two iloads in a pair.  Comparing against fast_iload means that
     // the next bytecode is neither an iload or a caload, and therefore
     // an iload pair.
     __ cmpl(rbx, Bytecodes::_iload);
     __ jcc(Assembler::equal, done);

     __ cmpl(rbx, Bytecodes::_fast_iload);
     __ movl(bc, Bytecodes::_fast_iload2);
     __ jccb(Assembler::equal, rewrite);

     // if _caload, rewrite to fast_icaload
     __ cmpl(rbx, Bytecodes::_caload);
     __ movl(bc, Bytecodes::_fast_icaload);
     __ jccb(Assembler::equal, rewrite);

     // rewrite so iload doesn't check again.
     __ movl(bc, Bytecodes::_fast_iload);

     // rewrite
     // bc: fast bytecode
     __ bind(rewrite);
     patch_bytecode(Bytecodes::_iload, bc, rbx, false);
     __ bind(done);
   }

   // Get the local value into tos
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
 }

 void TemplateTable::fast_iload2() {
   transition(vtos, itos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
   __ push(itos);
   locals_index(rbx, 3);
   __ movl(rax, iaddress(rbx));
 }

 void TemplateTable::fast_iload() {
   transition(vtos, itos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
 }

 void TemplateTable::lload() {
   transition(vtos, ltos);
   locals_index(rbx);
   __ movq(rax, laddress(rbx));
 }

 void TemplateTable::fload() {
   transition(vtos, ftos);
   locals_index(rbx);
   __ movflt(xmm0, faddress(rbx));
 }

 void TemplateTable::dload() {
   transition(vtos, dtos);
   locals_index(rbx);
   __ movdbl(xmm0, daddress(rbx));
 }

 void TemplateTable::aload() {
   transition(vtos, atos);
   locals_index(rbx);
   __ movptr(rax, aaddress(rbx));
 }

 void TemplateTable::locals_index_wide(Register reg) {
   __ load_unsigned_short(reg, at_bcp(2));
   __ bswapl(reg);
   __ shrl(reg, 16);
   __ negptr(reg);
 }

 void TemplateTable::wide_iload() {
   transition(vtos, itos);
   locals_index_wide(rbx);
   __ movl(rax, iaddress(rbx));
 }

 void TemplateTable::wide_lload() {
   transition(vtos, ltos);
   locals_index_wide(rbx);
   __ movq(rax, laddress(rbx));
 }

 void TemplateTable::wide_fload() {
   transition(vtos, ftos);
   locals_index_wide(rbx);
   __ movflt(xmm0, faddress(rbx));
 }

 void TemplateTable::wide_dload() {
   transition(vtos, dtos);
   locals_index_wide(rbx);
   __ movdbl(xmm0, daddress(rbx));
 }

 void TemplateTable::wide_aload() {
   transition(vtos, atos);
   locals_index_wide(rbx);
   __ movptr(rax, aaddress(rbx));
 }

 void TemplateTable::index_check(Register array, Register index) {
   // destroys rbx
   // check array
   __ null_check(array, arrayOopDesc::length_offset_in_bytes());
   // sign extend index for use by indexed load
   __ movl2ptr(index, index);
   // check index
   __ cmpl(index, Address(array, arrayOopDesc::length_offset_in_bytes()));
   if (index != rbx) {
     // ??? convention: move aberrant index into ebx for exception message
     assert(rbx != array, "different registers");
     __ movl(rbx, index);
   }
   __ jump_cc(Assembler::aboveEqual,
              ExternalAddress(Interpreter::_throw_ArrayIndexOutOfBoundsException_entry));
 }

 void TemplateTable::iaload() {
   transition(itos, itos);
   __ pop_ptr(rdx);
   // eax: index
   // rdx: array
   index_check(rdx, rax); // kills rbx
   __ movl(rax, Address(rdx, rax,
                        Address::times_4,
                        arrayOopDesc::base_offset_in_bytes(T_INT)));
 }

 void TemplateTable::laload() {
   transition(itos, ltos);
   __ pop_ptr(rdx);
   // eax: index
   // rdx: array
   index_check(rdx, rax); // kills rbx
   __ movq(rax, Address(rdx, rbx,
                        Address::times_8,
                        arrayOopDesc::base_offset_in_bytes(T_LONG)));
 }

 void TemplateTable::faload() {
   transition(itos, ftos);
   __ pop_ptr(rdx);
   // eax: index
   // rdx: array
   index_check(rdx, rax); // kills rbx
   __ movflt(xmm0, Address(rdx, rax,
                          Address::times_4,
                          arrayOopDesc::base_offset_in_bytes(T_FLOAT)));
 }

 void TemplateTable::daload() {
   transition(itos, dtos);
   __ pop_ptr(rdx);
   // eax: index
   // rdx: array
   index_check(rdx, rax); // kills rbx
   __ movdbl(xmm0, Address(rdx, rax,
                           Address::times_8,
                           arrayOopDesc::base_offset_in_bytes(T_DOUBLE)));
 }

 void TemplateTable::aaload() {
   transition(itos, atos);
   __ pop_ptr(rdx);
   // eax: index
   // rdx: array
   index_check(rdx, rax); // kills rbx
   __ load_heap_oop(rax, Address(rdx, rax,
                                 UseCompressedOops ? Address::times_4 : Address::times_8,
                                 arrayOopDesc::base_offset_in_bytes(T_OBJECT)));
 }

 void TemplateTable::baload() {
   transition(itos, itos);
   __ pop_ptr(rdx);
   // eax: index
   // rdx: array
   index_check(rdx, rax); // kills rbx
   __ load_signed_byte(rax,
                       Address(rdx, rax,
                               Address::times_1,
                               arrayOopDesc::base_offset_in_bytes(T_BYTE)));
 }

 void TemplateTable::caload() {
   transition(itos, itos);
   __ pop_ptr(rdx);
   // eax: index
   // rdx: array
   index_check(rdx, rax); // kills rbx
   __ load_unsigned_short(rax,
                          Address(rdx, rax,
                                  Address::times_2,
                                  arrayOopDesc::base_offset_in_bytes(T_CHAR)));
 }

 // iload followed by caload frequent pair
 void TemplateTable::fast_icaload() {
   transition(vtos, itos);
   // load index out of locals
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));

   // eax: index
   // rdx: array
   __ pop_ptr(rdx);
   index_check(rdx, rax); // kills rbx
   __ load_unsigned_short(rax,
                          Address(rdx, rax,
                                  Address::times_2,
                                  arrayOopDesc::base_offset_in_bytes(T_CHAR)));
 }

 void TemplateTable::saload() {
   transition(itos, itos);
   __ pop_ptr(rdx);
   // eax: index
   // rdx: array
   index_check(rdx, rax); // kills rbx
   __ load_signed_short(rax,
                        Address(rdx, rax,
                                Address::times_2,
                                arrayOopDesc::base_offset_in_bytes(T_SHORT)));
 }

 void TemplateTable::iload(int n) {
   transition(vtos, itos);
   __ movl(rax, iaddress(n));
 }

 void TemplateTable::lload(int n) {
   transition(vtos, ltos);
   __ movq(rax, laddress(n));
 }

 void TemplateTable::fload(int n) {
   transition(vtos, ftos);
   __ movflt(xmm0, faddress(n));
 }

 void TemplateTable::dload(int n) {
   transition(vtos, dtos);
   __ movdbl(xmm0, daddress(n));
 }

 void TemplateTable::aload(int n) {
   transition(vtos, atos);
   __ movptr(rax, aaddress(n));
 }

 void TemplateTable::aload_0() {
   transition(vtos, atos);
   // According to bytecode histograms, the pairs:
   //
   // _aload_0, _fast_igetfield
   // _aload_0, _fast_agetfield
   // _aload_0, _fast_fgetfield
   //
   // occur frequently. If RewriteFrequentPairs is set, the (slow)
   // _aload_0 bytecode checks if the next bytecode is either
   // _fast_igetfield, _fast_agetfield or _fast_fgetfield and then
   // rewrites the current bytecode into a pair bytecode; otherwise it
   // rewrites the current bytecode into _fast_aload_0 that doesn't do
   // the pair check anymore.
   //
   // Note: If the next bytecode is _getfield, the rewrite must be
   //       delayed, otherwise we may miss an opportunity for a pair.
   //
   // Also rewrite frequent pairs
   //   aload_0, aload_1
   //   aload_0, iload_1
   // These bytecodes with a small amount of code are most profitable
   // to rewrite
   if (RewriteFrequentPairs) {
     Label rewrite, done;
     const Register bc = c_rarg3;
     assert(rbx != bc, "register damaged");
     // get next byte
     __ load_unsigned_byte(rbx,
                           at_bcp(Bytecodes::length_for(Bytecodes::_aload_0)));

     // do actual aload_0
     aload(0);

     // if _getfield then wait with rewrite
     __ cmpl(rbx, Bytecodes::_getfield);
     __ jcc(Assembler::equal, done);

     // if _igetfield then reqrite to _fast_iaccess_0
     assert(Bytecodes::java_code(Bytecodes::_fast_iaccess_0) ==
            Bytecodes::_aload_0,
            "fix bytecode definition");
     __ cmpl(rbx, Bytecodes::_fast_igetfield);
     __ movl(bc, Bytecodes::_fast_iaccess_0);
     __ jccb(Assembler::equal, rewrite);

     // if _agetfield then reqrite to _fast_aaccess_0
     assert(Bytecodes::java_code(Bytecodes::_fast_aaccess_0) ==
            Bytecodes::_aload_0,
            "fix bytecode definition");
     __ cmpl(rbx, Bytecodes::_fast_agetfield);
     __ movl(bc, Bytecodes::_fast_aaccess_0);
     __ jccb(Assembler::equal, rewrite);

     // if _fgetfield then reqrite to _fast_faccess_0
     assert(Bytecodes::java_code(Bytecodes::_fast_faccess_0) ==
            Bytecodes::_aload_0,
            "fix bytecode definition");
     __ cmpl(rbx, Bytecodes::_fast_fgetfield);
     __ movl(bc, Bytecodes::_fast_faccess_0);
     __ jccb(Assembler::equal, rewrite);

     // else rewrite to _fast_aload0
     assert(Bytecodes::java_code(Bytecodes::_fast_aload_0) ==
            Bytecodes::_aload_0,
            "fix bytecode definition");
     __ movl(bc, Bytecodes::_fast_aload_0);

     // rewrite
     // bc: fast bytecode
     __ bind(rewrite);
     patch_bytecode(Bytecodes::_aload_0, bc, rbx, false);

     __ bind(done);
   } else {
     aload(0);
   }
 }

 void TemplateTable::istore() {
   transition(itos, vtos);
   locals_index(rbx);
   __ movl(iaddress(rbx), rax);
 }

 void TemplateTable::lstore() {
   transition(ltos, vtos);
   locals_index(rbx);
   __ movq(laddress(rbx), rax);
 }

 void TemplateTable::fstore() {
   transition(ftos, vtos);
   locals_index(rbx);
   __ movflt(faddress(rbx), xmm0);
 }

 void TemplateTable::dstore() {
   transition(dtos, vtos);
   locals_index(rbx);
   __ movdbl(daddress(rbx), xmm0);
 }

 void TemplateTable::astore() {
   transition(vtos, vtos);
   __ pop_ptr(rax);
   locals_index(rbx);
   __ movptr(aaddress(rbx), rax);
 }

 void TemplateTable::wide_istore() {
   transition(vtos, vtos);
   __ pop_i();
   locals_index_wide(rbx);
   __ movl(iaddress(rbx), rax);
 }

 void TemplateTable::wide_lstore() {
   transition(vtos, vtos);
   __ pop_l();
   locals_index_wide(rbx);
   __ movq(laddress(rbx), rax);
 }

 void TemplateTable::wide_fstore() {
   transition(vtos, vtos);
   __ pop_f();
   locals_index_wide(rbx);
   __ movflt(faddress(rbx), xmm0);
 }

 void TemplateTable::wide_dstore() {
   transition(vtos, vtos);
   __ pop_d();
   locals_index_wide(rbx);
   __ movdbl(daddress(rbx), xmm0);
 }

 void TemplateTable::wide_astore() {
   transition(vtos, vtos);
   __ pop_ptr(rax);
   locals_index_wide(rbx);
   __ movptr(aaddress(rbx), rax);
 }

 void TemplateTable::iastore() {
   transition(itos, vtos);
   __ pop_i(rbx);
   __ pop_ptr(rdx);
   // eax: value
   // ebx: index
   // rdx: array
   index_check(rdx, rbx); // prefer index in ebx
   __ movl(Address(rdx, rbx,
                   Address::times_4,
                   arrayOopDesc::base_offset_in_bytes(T_INT)),
           rax);
 }

 void TemplateTable::lastore() {
   transition(ltos, vtos);
   __ pop_i(rbx);
   __ pop_ptr(rdx);
   // rax: value
   // ebx: index
   // rdx: array
   index_check(rdx, rbx); // prefer index in ebx
   __ movq(Address(rdx, rbx,
                   Address::times_8,
                   arrayOopDesc::base_offset_in_bytes(T_LONG)),
           rax);
 }

 void TemplateTable::fastore() {
   transition(ftos, vtos);
   __ pop_i(rbx);
   __ pop_ptr(rdx);
   // xmm0: value
   // ebx:  index
   // rdx:  array
   index_check(rdx, rbx); // prefer index in ebx
   __ movflt(Address(rdx, rbx,
                    Address::times_4,
                    arrayOopDesc::base_offset_in_bytes(T_FLOAT)),
            xmm0);
 }

 void TemplateTable::dastore() {
   transition(dtos, vtos);
   __ pop_i(rbx);
   __ pop_ptr(rdx);
   // xmm0: value
   // ebx:  index
   // rdx:  array
   index_check(rdx, rbx); // prefer index in ebx
   __ movdbl(Address(rdx, rbx,
                    Address::times_8,
                    arrayOopDesc::base_offset_in_bytes(T_DOUBLE)),
            xmm0);
 }

 void TemplateTable::aastore() {
   Label is_null, ok_is_subtype, done;
   transition(vtos, vtos);
   // stack: ..., array, index, value
   __ movptr(rax, at_tos());    // value
   __ movl(rcx, at_tos_p1()); // index
   __ movptr(rdx, at_tos_p2()); // array

   Address element_address(rdx, rcx,
                           UseCompressedOops? Address::times_4 : Address::times_8,
                           arrayOopDesc::base_offset_in_bytes(T_OBJECT));

   index_check(rdx, rcx);     // kills rbx
   // do array store check - check for NULL value first
   __ testptr(rax, rax);
   __ jcc(Assembler::zero, is_null);

   // Move subklass into rbx
   __ load_klass(rbx, rax);
   // Move superklass into rax
   __ load_klass(rax, rdx);
   __ movptr(rax, Address(rax,
                          ObjArrayKlass::element_klass_offset()));
   // Compress array + index*oopSize + 12 into a single register.  Frees rcx.
   __ lea(rdx, element_address);

   // Generate subtype check.  Blows rcx, rdi
   // Superklass in rax.  Subklass in rbx.
   __ gen_subtype_check(rbx, ok_is_subtype);

   // Come here on failure
   // object is at TOS
   __ jump(ExternalAddress(Interpreter::_throw_ArrayStoreException_entry));

   // Come here on success
   __ bind(ok_is_subtype);

   // Get the value we will store
   __ movptr(rax, at_tos());
   // Now store using the appropriate barrier
   do_oop_store(_masm, Address(rdx, 0), rax, _bs->kind(), true);
   __ jmp(done);

   // Have a NULL in rax, rdx=array, ecx=index.  Store NULL at ary[idx]
   __ bind(is_null);
   __ profile_null_seen(rbx);

   // Store a NULL
   do_oop_store(_masm, element_address, noreg, _bs->kind(), true);

   // Pop stack arguments
   __ bind(done);
   __ addptr(rsp, 3 * Interpreter::stackElementSize);
 }

 void TemplateTable::bastore() {
   transition(itos, vtos);
   __ pop_i(rbx);
   __ pop_ptr(rdx);
   // eax: value
   // ebx: index
   // rdx: array
   index_check(rdx, rbx); // prefer index in ebx
   // Need to check whether array is boolean or byte
   // since both types share the bastore bytecode.
   __ load_klass(rcx, rdx);
   __ movl(rcx, Address(rcx, Klass::layout_helper_offset()));
   int diffbit = Klass::layout_helper_boolean_diffbit();
   __ testl(rcx, diffbit);
   Label L_skip;
   __ jccb(Assembler::zero, L_skip);
   __ andl(rax, 1);  // if it is a T_BOOLEAN array, mask the stored value to 0/1
   __ bind(L_skip);
   __ movb(Address(rdx, rbx,
                   Address::times_1,
                   arrayOopDesc::base_offset_in_bytes(T_BYTE)),
           rax);
 }

 void TemplateTable::castore() {
   transition(itos, vtos);
   __ pop_i(rbx);
   __ pop_ptr(rdx);
   // eax: value
   // ebx: index
   // rdx: array
   index_check(rdx, rbx);  // prefer index in ebx
   __ movw(Address(rdx, rbx,
                   Address::times_2,
                   arrayOopDesc::base_offset_in_bytes(T_CHAR)),
           rax);
 }

 void TemplateTable::sastore() {
   castore();
 }

 void TemplateTable::istore(int n) {
   transition(itos, vtos);
   __ movl(iaddress(n), rax);
 }

 void TemplateTable::lstore(int n) {
   transition(ltos, vtos);
   __ movq(laddress(n), rax);
 }

 void TemplateTable::fstore(int n) {
   transition(ftos, vtos);
   __ movflt(faddress(n), xmm0);
 }

 void TemplateTable::dstore(int n) {
   transition(dtos, vtos);
   __ movdbl(daddress(n), xmm0);
 }

 void TemplateTable::astore(int n) {
   transition(vtos, vtos);
   __ pop_ptr(rax);
   __ movptr(aaddress(n), rax);
 }

 void TemplateTable::pop() {
   transition(vtos, vtos);
   __ addptr(rsp, Interpreter::stackElementSize);
 }

 void TemplateTable::pop2() {
   transition(vtos, vtos);
   __ addptr(rsp, 2 * Interpreter::stackElementSize);
 }

 void TemplateTable::dup() {
   transition(vtos, vtos);
   __ load_ptr(0, rax);
   __ push_ptr(rax);
   // stack: ..., a, a
 }

 void TemplateTable::dup_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b
   __ load_ptr( 0, rax);  // load b
   __ load_ptr( 1, rcx);  // load a
   __ store_ptr(1, rax);  // store b
   __ store_ptr(0, rcx);  // store a
   __ push_ptr(rax);      // push b
   // stack: ..., b, a, b
 }

 void TemplateTable::dup_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
   __ load_ptr( 0, rax);  // load c
   __ load_ptr( 2, rcx);  // load a
   __ store_ptr(2, rax);  // store c in a
   __ push_ptr(rax);      // push c
   // stack: ..., c, b, c, c
   __ load_ptr( 2, rax);  // load b
   __ store_ptr(2, rcx);  // store a in b
   // stack: ..., c, a, c, c
   __ store_ptr(1, rax);  // store b in c
   // stack: ..., c, a, b, c
 }

 void TemplateTable::dup2() {
   transition(vtos, vtos);
   // stack: ..., a, b
   __ load_ptr(1, rax);  // load a
   __ push_ptr(rax);     // push a
   __ load_ptr(1, rax);  // load b
   __ push_ptr(rax);     // push b
   // stack: ..., a, b, a, b
 }

 void TemplateTable::dup2_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
   __ load_ptr( 0, rcx);  // load c
   __ load_ptr( 1, rax);  // load b
   __ push_ptr(rax);      // push b
   __ push_ptr(rcx);      // push c
   // stack: ..., a, b, c, b, c
   __ store_ptr(3, rcx);  // store c in b
   // stack: ..., a, c, c, b, c
   __ load_ptr( 4, rcx);  // load a
   __ store_ptr(2, rcx);  // store a in 2nd c
   // stack: ..., a, c, a, b, c
   __ store_ptr(4, rax);  // store b in a
   // stack: ..., b, c, a, b, c
 }

 void TemplateTable::dup2_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c, d
   __ load_ptr( 0, rcx);  // load d
   __ load_ptr( 1, rax);  // load c
   __ push_ptr(rax);      // push c
   __ push_ptr(rcx);      // push d
   // stack: ..., a, b, c, d, c, d
   __ load_ptr( 4, rax);  // load b
   __ store_ptr(2, rax);  // store b in d
   __ store_ptr(4, rcx);  // store d in b
   // stack: ..., a, d, c, b, c, d
   __ load_ptr( 5, rcx);  // load a
   __ load_ptr( 3, rax);  // load c
   __ store_ptr(3, rcx);  // store a in c
   __ store_ptr(5, rax);  // store c in a
   // stack: ..., c, d, a, b, c, d
 }

 void TemplateTable::swap() {
   transition(vtos, vtos);
   // stack: ..., a, b
   __ load_ptr( 1, rcx);  // load a
   __ load_ptr( 0, rax);  // load b
   __ store_ptr(0, rcx);  // store a in b
   __ store_ptr(1, rax);  // store b in a
   // stack: ..., b, a
 }

 void TemplateTable::iop2(Operation op) {
   transition(itos, itos);
   switch (op) {
   case add  :                    __ pop_i(rdx); __ addl (rax, rdx); break;
   case sub  : __ movl(rdx, rax); __ pop_i(rax); __ subl (rax, rdx); break;
   case mul  :                    __ pop_i(rdx); __ imull(rax, rdx); break;
   case _and :                    __ pop_i(rdx); __ andl (rax, rdx); break;
   case _or  :                    __ pop_i(rdx); __ orl  (rax, rdx); break;
   case _xor :                    __ pop_i(rdx); __ xorl (rax, rdx); break;
   case shl  : __ movl(rcx, rax); __ pop_i(rax); __ shll (rax);      break;
   case shr  : __ movl(rcx, rax); __ pop_i(rax); __ sarl (rax);      break;
   case ushr : __ movl(rcx, rax); __ pop_i(rax); __ shrl (rax);      break;
   default   : ShouldNotReachHere();
   }
 }

 void TemplateTable::lop2(Operation op) {
   transition(ltos, ltos);
   switch (op) {
   case add  :                    __ pop_l(rdx); __ addptr(rax, rdx); break;
   case sub  : __ mov(rdx, rax);  __ pop_l(rax); __ subptr(rax, rdx); break;
   case _and :                    __ pop_l(rdx); __ andptr(rax, rdx); break;
   case _or  :                    __ pop_l(rdx); __ orptr (rax, rdx); break;
   case _xor :                    __ pop_l(rdx); __ xorptr(rax, rdx); break;
   default   : ShouldNotReachHere();
   }
 }

 void TemplateTable::idiv() {
   transition(itos, itos);
   __ movl(rcx, rax);
   __ pop_i(rax);
   // Note: could xor eax and ecx and compare with (-1 ^ min_int). If
   //       they are not equal, one could do a normal division (no correction
   //       needed), which may speed up this implementation for the common case.
   //       (see also JVM spec., p.243 & p.271)
   __ corrected_idivl(rcx);
 }

 void TemplateTable::irem() {
   transition(itos, itos);
   __ movl(rcx, rax);
   __ pop_i(rax);
   // Note: could xor eax and ecx and compare with (-1 ^ min_int). If
   //       they are not equal, one could do a normal division (no correction
   //       needed), which may speed up this implementation for the common case.
   //       (see also JVM spec., p.243 & p.271)
   __ corrected_idivl(rcx);
   __ movl(rax, rdx);
 }

 void TemplateTable::lmul() {
   transition(ltos, ltos);
   __ pop_l(rdx);
   __ imulq(rax, rdx);
 }

 void TemplateTable::ldiv() {
   transition(ltos, ltos);
   __ mov(rcx, rax);
   __ pop_l(rax);
   // generate explicit div0 check
   __ testq(rcx, rcx);
   __ jump_cc(Assembler::zero,
              ExternalAddress(Interpreter::_throw_ArithmeticException_entry));
   // Note: could xor rax and rcx and compare with (-1 ^ min_int). If
   //       they are not equal, one could do a normal division (no correction
   //       needed), which may speed up this implementation for the common case.
   //       (see also JVM spec., p.243 & p.271)
   __ corrected_idivq(rcx); // kills rbx
 }

 void TemplateTable::lrem() {
   transition(ltos, ltos);
   __ mov(rcx, rax);
   __ pop_l(rax);
   __ testq(rcx, rcx);
   __ jump_cc(Assembler::zero,
              ExternalAddress(Interpreter::_throw_ArithmeticException_entry));
   // Note: could xor rax and rcx and compare with (-1 ^ min_int). If
   //       they are not equal, one could do a normal division (no correction
   //       needed), which may speed up this implementation for the common case.
   //       (see also JVM spec., p.243 & p.271)
   __ corrected_idivq(rcx); // kills rbx
   __ mov(rax, rdx);
 }

 void TemplateTable::lshl() {
   transition(itos, ltos);
   __ movl(rcx, rax);                             // get shift count
   __ pop_l(rax);                                 // get shift value
   __ shlq(rax);
 }

 void TemplateTable::lshr() {
   transition(itos, ltos);
   __ movl(rcx, rax);                             // get shift count
   __ pop_l(rax);                                 // get shift value
   __ sarq(rax);
 }

 void TemplateTable::lushr() {
   transition(itos, ltos);
   __ movl(rcx, rax);                             // get shift count
   __ pop_l(rax);                                 // get shift value
   __ shrq(rax);
 }

 void TemplateTable::fop2(Operation op) {
   transition(ftos, ftos);
   switch (op) {
   case add:
     __ addss(xmm0, at_rsp());
     __ addptr(rsp, Interpreter::stackElementSize);
     break;
   case sub:
     __ movflt(xmm1, xmm0);
     __ pop_f(xmm0);
     __ subss(xmm0, xmm1);
     break;
   case mul:
     __ mulss(xmm0, at_rsp());
     __ addptr(rsp, Interpreter::stackElementSize);
     break;
   case div:
     __ movflt(xmm1, xmm0);
     __ pop_f(xmm0);
     __ divss(xmm0, xmm1);
     break;
   case rem:
     __ movflt(xmm1, xmm0);
     __ pop_f(xmm0);
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::frem), 2);
     break;
   default:
     ShouldNotReachHere();
     break;
   }
 }

 void TemplateTable::dop2(Operation op) {
   transition(dtos, dtos);
   switch (op) {
   case add:
     __ addsd(xmm0, at_rsp());
     __ addptr(rsp, 2 * Interpreter::stackElementSize);
     break;
   case sub:
     __ movdbl(xmm1, xmm0);
     __ pop_d(xmm0);
     __ subsd(xmm0, xmm1);
     break;
   case mul:
     __ mulsd(xmm0, at_rsp());
     __ addptr(rsp, 2 * Interpreter::stackElementSize);
     break;
   case div:
     __ movdbl(xmm1, xmm0);
     __ pop_d(xmm0);
     __ divsd(xmm0, xmm1);
     break;
   case rem:
     __ movdbl(xmm1, xmm0);
     __ pop_d(xmm0);
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::drem), 2);
     break;
   default:
     ShouldNotReachHere();
     break;
   }
 }

 void TemplateTable::ineg() {
   transition(itos, itos);
   __ negl(rax);
 }

 void TemplateTable::lneg() {
   transition(ltos, ltos);
   __ negq(rax);
 }

 // Note: 'double' and 'long long' have 32-bits alignment on x86.
 static jlong* double_quadword(jlong *adr, jlong lo, jlong hi) {
   // Use the expression (adr)&(~0xF) to provide 128-bits aligned address
   // of 128-bits operands for SSE instructions.
   jlong *operand = (jlong*)(((intptr_t)adr)&((intptr_t)(~0xF)));
   // Store the value to a 128-bits operand.
   operand[0] = lo;
   operand[1] = hi;
   return operand;
 }

 // Buffer for 128-bits masks used by SSE instructions.
 static jlong float_signflip_pool[2*2];
 static jlong double_signflip_pool[2*2];

 void TemplateTable::fneg() {
   transition(ftos, ftos);
   static jlong *float_signflip  = double_quadword(&float_signflip_pool[1], 0x8000000080000000, 0x8000000080000000);
   __ xorps(xmm0, ExternalAddress((address) float_signflip));
 }

 void TemplateTable::dneg() {
   transition(dtos, dtos);
   static jlong *double_signflip  = double_quadword(&double_signflip_pool[1], 0x8000000000000000, 0x8000000000000000);
   __ xorpd(xmm0, ExternalAddress((address) double_signflip));
 }

 void TemplateTable::iinc() {
   transition(vtos, vtos);
   __ load_signed_byte(rdx, at_bcp(2)); // get constant
   locals_index(rbx);
   __ addl(iaddress(rbx), rdx);
 }

 void TemplateTable::wide_iinc() {
   transition(vtos, vtos);
   __ movl(rdx, at_bcp(4)); // get constant
   locals_index_wide(rbx);
   __ bswapl(rdx); // swap bytes & sign-extend constant
   __ sarl(rdx, 16);
   __ addl(iaddress(rbx), rdx);
   // Note: should probably use only one movl to get both
   //       the index and the constant -> fix this
 }

 void TemplateTable::convert() {
   // Checking
 #ifdef ASSERT
   {
     TosState tos_in  = ilgl;
     TosState tos_out = ilgl;
     switch (bytecode()) {
     case Bytecodes::_i2l: // fall through
     case Bytecodes::_i2f: // fall through
     case Bytecodes::_i2d: // fall through
     case Bytecodes::_i2b: // fall through
     case Bytecodes::_i2c: // fall through
     case Bytecodes::_i2s: tos_in = itos; break;
     case Bytecodes::_l2i: // fall through
     case Bytecodes::_l2f: // fall through
     case Bytecodes::_l2d: tos_in = ltos; break;
     case Bytecodes::_f2i: // fall through
     case Bytecodes::_f2l: // fall through
     case Bytecodes::_f2d: tos_in = ftos; break;
     case Bytecodes::_d2i: // fall through
     case Bytecodes::_d2l: // fall through
     case Bytecodes::_d2f: tos_in = dtos; break;
     default             : ShouldNotReachHere();
     }
     switch (bytecode()) {
     case Bytecodes::_l2i: // fall through
     case Bytecodes::_f2i: // fall through
     case Bytecodes::_d2i: // fall through
     case Bytecodes::_i2b: // fall through
     case Bytecodes::_i2c: // fall through
     case Bytecodes::_i2s: tos_out = itos; break;
     case Bytecodes::_i2l: // fall through
     case Bytecodes::_f2l: // fall through
     case Bytecodes::_d2l: tos_out = ltos; break;
     case Bytecodes::_i2f: // fall through
     case Bytecodes::_l2f: // fall through
     case Bytecodes::_d2f: tos_out = ftos; break;
     case Bytecodes::_i2d: // fall through
     case Bytecodes::_l2d: // fall through
     case Bytecodes::_f2d: tos_out = dtos; break;
     default             : ShouldNotReachHere();
     }
     transition(tos_in, tos_out);
   }
 #endif // ASSERT

   static const int64_t is_nan = 0x8000000000000000L;

   // Conversion
   switch (bytecode()) {
   case Bytecodes::_i2l:
     __ movslq(rax, rax);
     break;
   case Bytecodes::_i2f:
     __ cvtsi2ssl(xmm0, rax);
     break;
   case Bytecodes::_i2d:
     __ cvtsi2sdl(xmm0, rax);
     break;
   case Bytecodes::_i2b:
     __ movsbl(rax, rax);
     break;
   case Bytecodes::_i2c:
     __ movzwl(rax, rax);
     break;
   case Bytecodes::_i2s:
     __ movswl(rax, rax);
     break;
   case Bytecodes::_l2i:
     __ movl(rax, rax);
     break;
   case Bytecodes::_l2f:
     __ cvtsi2ssq(xmm0, rax);
     break;
   case Bytecodes::_l2d:
     __ cvtsi2sdq(xmm0, rax);
     break;
   case Bytecodes::_f2i:
   {
     Label L;
     __ cvttss2sil(rax, xmm0);
     __ cmpl(rax, 0x80000000); // NaN or overflow/underflow?
     __ jcc(Assembler::notEqual, L);
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::f2i), 1);
     __ bind(L);
   }
     break;
   case Bytecodes::_f2l:
   {
     Label L;
     __ cvttss2siq(rax, xmm0);
     // NaN or overflow/underflow?
     __ cmp64(rax, ExternalAddress((address) &is_nan));
     __ jcc(Assembler::notEqual, L);
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::f2l), 1);
     __ bind(L);
   }
     break;
   case Bytecodes::_f2d:
     __ cvtss2sd(xmm0, xmm0);
     break;
   case Bytecodes::_d2i:
   {
     Label L;
     __ cvttsd2sil(rax, xmm0);
     __ cmpl(rax, 0x80000000); // NaN or overflow/underflow?
     __ jcc(Assembler::notEqual, L);
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::d2i), 1);
     __ bind(L);
   }
     break;
   case Bytecodes::_d2l:
   {
     Label L;
     __ cvttsd2siq(rax, xmm0);
     // NaN or overflow/underflow?
     __ cmp64(rax, ExternalAddress((address) &is_nan));
     __ jcc(Assembler::notEqual, L);
     __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::d2l), 1);
     __ bind(L);
   }
     break;
   case Bytecodes::_d2f:
     __ cvtsd2ss(xmm0, xmm0);
     break;
   default:
     ShouldNotReachHere();
   }
 }

 void TemplateTable::lcmp() {
   transition(ltos, itos);
   Label done;
   __ pop_l(rdx);
   __ cmpq(rdx, rax);
   __ movl(rax, -1);
   __ jccb(Assembler::less, done);
   __ setb(Assembler::notEqual, rax);
   __ movzbl(rax, rax);
   __ bind(done);
 }

 void TemplateTable::float_cmp(bool is_float, int unordered_result) {
   Label done;
   if (is_float) {
     // XXX get rid of pop here, use ... reg, mem32
     __ pop_f(xmm1);
     __ ucomiss(xmm1, xmm0);
   } else {
     // XXX get rid of pop here, use ... reg, mem64
     __ pop_d(xmm1);
     __ ucomisd(xmm1, xmm0);
   }
   if (unordered_result < 0) {
     __ movl(rax, -1);
     __ jccb(Assembler::parity, done);
     __ jccb(Assembler::below, done);
     __ setb(Assembler::notEqual, rdx);
     __ movzbl(rax, rdx);
   } else {
     __ movl(rax, 1);
     __ jccb(Assembler::parity, done);
     __ jccb(Assembler::above, done);
     __ movl(rax, 0);
     __ jccb(Assembler::equal, done);
     __ decrementl(rax);
   }
   __ bind(done);
 }

 void TemplateTable::branch(bool is_jsr, bool is_wide) {
   __ get_method(rcx); // rcx holds method
   __ profile_taken_branch(rax, rbx); // rax holds updated MDP, rbx
                                      // holds bumped taken count

   const ByteSize be_offset = MethodCounters::backedge_counter_offset() +
                              InvocationCounter::counter_offset();
   const ByteSize inv_offset = MethodCounters::invocation_counter_offset() +
                               InvocationCounter::counter_offset();

   // Load up edx with the branch displacement
   if (is_wide) {
     __ movl(rdx, at_bcp(1));
   } else {
     __ load_signed_short(rdx, at_bcp(1));
   }
   __ bswapl(rdx);

   if (!is_wide) {
     __ sarl(rdx, 16);
   }
   __ movl2ptr(rdx, rdx);

   // Handle all the JSR stuff here, then exit.
   // It's much shorter and cleaner than intermingling with the non-JSR
   // normal-branch stuff occurring below.
   if (is_jsr) {
     // Pre-load the next target bytecode into rbx
     __ load_unsigned_byte(rbx, Address(r13, rdx, Address::times_1, 0));

     // compute return address as bci in rax
     __ lea(rax, at_bcp((is_wide ? 5 : 3) -
                         in_bytes(ConstMethod::codes_offset())));
     __ subptr(rax, Address(rcx, Method::const_offset()));
     // Adjust the bcp in r13 by the displacement in rdx
     __ addptr(r13, rdx);
     // jsr returns atos that is not an oop
     __ push_i(rax);
     __ dispatch_only(vtos);
     return;
   }

   // Normal (non-jsr) branch handling

   // Adjust the bcp in r13 by the displacement in rdx
   __ addptr(r13, rdx);

   assert(UseLoopCounter || !UseOnStackReplacement,
          "on-stack-replacement requires loop counters");
   Label backedge_counter_overflow;
   Label profile_method;
   Label dispatch;
   if (UseLoopCounter) {
     // increment backedge counter for backward branches
     // rax: MDO
     // ebx: MDO bumped taken-count
     // rcx: method
     // rdx: target offset
     // r13: target bcp
     // r14: locals pointer
     __ testl(rdx, rdx);             // check if forward or backward branch
     __ jcc(Assembler::positive, dispatch); // count only if backward branch

     // check if MethodCounters exists
     Label has_counters;
     __ movptr(rax, Address(rcx, Method::method_counters_offset()));
     __ testptr(rax, rax);
     __ jcc(Assembler::notZero, has_counters);
     __ push(rdx);
     __ push(rcx);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::build_method_counters),
                rcx);
     __ pop(rcx);
     __ pop(rdx);
     __ movptr(rax, Address(rcx, Method::method_counters_offset()));
     __ jcc(Assembler::zero, dispatch);
     __ bind(has_counters);

     if (TieredCompilation) {
       Label no_mdo;
       int increment = InvocationCounter::count_increment;
       int mask = ((1 << Tier0BackedgeNotifyFreqLog) - 1) << InvocationCounter::count_shift;
       if (ProfileInterpreter) {
         // Are we profiling?
         __ movptr(rbx, Address(rcx, in_bytes(Method::method_data_offset())));
         __ testptr(rbx, rbx);
         __ jccb(Assembler::zero, no_mdo);
         // Increment the MDO backedge counter
         const Address mdo_backedge_counter(rbx, in_bytes(MethodData::backedge_counter_offset()) +
                                            in_bytes(InvocationCounter::counter_offset()));
         __ increment_mask_and_jump(mdo_backedge_counter, increment, mask,
                                    rax, false, Assembler::zero, &backedge_counter_overflow);
         __ jmp(dispatch);
       }
       __ bind(no_mdo);
       // Increment backedge counter in MethodCounters*
       __ movptr(rcx, Address(rcx, Method::method_counters_offset()));
       __ increment_mask_and_jump(Address(rcx, be_offset), increment, mask,
                                  rax, false, Assembler::zero, &backedge_counter_overflow);
     } else {
       // increment counter
       __ movptr(rcx, Address(rcx, Method::method_counters_offset()));
       __ movl(rax, Address(rcx, be_offset));        // load backedge counter
       __ incrementl(rax, InvocationCounter::count_increment); // increment counter
       __ movl(Address(rcx, be_offset), rax);        // store counter

       __ movl(rax, Address(rcx, inv_offset));    // load invocation counter

       __ andl(rax, InvocationCounter::count_mask_value); // and the status bits
       __ addl(rax, Address(rcx, be_offset));        // add both counters

       if (ProfileInterpreter) {
         // Test to see if we should create a method data oop
         __ cmp32(rax,
                  ExternalAddress((address) &InvocationCounter::InterpreterProfileLimit));
         __ jcc(Assembler::less, dispatch);

         // if no method data exists, go to profile method
         __ test_method_data_pointer(rax, profile_method);

         if (UseOnStackReplacement) {
           // check for overflow against ebx which is the MDO taken count
           __ cmp32(rbx,
                    ExternalAddress((address) &InvocationCounter::InterpreterBackwardBranchLimit));
           __ jcc(Assembler::below, dispatch);

           // When ProfileInterpreter is on, the backedge_count comes
           // from the MethodData*, which value does not get reset on
           // the call to frequency_counter_overflow().  To avoid
           // excessive calls to the overflow routine while the method is
           // being compiled, add a second test to make sure the overflow
           // function is called only once every overflow_frequency.
           const int overflow_frequency = 1024;
           __ andl(rbx, overflow_frequency - 1);
           __ jcc(Assembler::zero, backedge_counter_overflow);

         }
       } else {
         if (UseOnStackReplacement) {
           // check for overflow against eax, which is the sum of the
           // counters
           __ cmp32(rax,
                    ExternalAddress((address) &InvocationCounter::InterpreterBackwardBranchLimit));
           __ jcc(Assembler::aboveEqual, backedge_counter_overflow);

         }
       }
     }
     __ bind(dispatch);
   }

   // Pre-load the next target bytecode into rbx
   __ load_unsigned_byte(rbx, Address(r13, 0));

   // continue with the bytecode @ target
   // eax: return bci for jsr's, unused otherwise
   // ebx: target bytecode
   // r13: target bcp
   __ dispatch_only(vtos);

   if (UseLoopCounter) {
     if (ProfileInterpreter) {
       // Out-of-line code to allocate method data oop.
       __ bind(profile_method);
       __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
       __ load_unsigned_byte(rbx, Address(r13, 0));  // restore target bytecode
       __ set_method_data_pointer_for_bcp();
       __ jmp(dispatch);
     }

     if (UseOnStackReplacement) {
       // invocation counter overflow
       __ bind(backedge_counter_overflow);
       __ negptr(rdx);
       __ addptr(rdx, r13); // branch bcp
       // IcoResult frequency_counter_overflow([JavaThread*], address branch_bcp)
       __ call_VM(noreg,
                  CAST_FROM_FN_PTR(address,
                                   InterpreterRuntime::frequency_counter_overflow),
                  rdx);
       __ load_unsigned_byte(rbx, Address(r13, 0));  // restore target bytecode

       // rax: osr nmethod (osr ok) or NULL (osr not possible)
       // ebx: target bytecode
       // rdx: scratch
       // r14: locals pointer
       // r13: bcp
       __ testptr(rax, rax);                        // test result
       __ jcc(Assembler::zero, dispatch);         // no osr if null
       // nmethod may have been invalidated (VM may block upon call_VM return)
       __ movl(rcx, Address(rax, nmethod::entry_bci_offset()));
       __ cmpl(rcx, InvalidOSREntryBci);
       __ jcc(Assembler::equal, dispatch);

       // We have the address of an on stack replacement routine in eax
       // We need to prepare to execute the OSR method. First we must
       // migrate the locals and monitors off of the stack.

       __ mov(r13, rax);                             // save the nmethod

       call_VM(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_begin));

       // eax is OSR buffer, move it to expected parameter location
       __ mov(j_rarg0, rax);

       // We use j_rarg definitions here so that registers don't conflict as parameter
       // registers change across platforms as we are in the midst of a calling
       // sequence to the OSR nmethod and we don't want collision. These are NOT parameters.

       const Register retaddr = j_rarg2;
       const Register sender_sp = j_rarg1;

       // pop the interpreter frame
       __ movptr(sender_sp, Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize)); // get sender sp
       __ leave();                                // remove frame anchor
       __ pop(retaddr);                           // get return address
       __ mov(rsp, sender_sp);                   // set sp to sender sp
       // Ensure compiled code always sees stack at proper alignment
       __ andptr(rsp, -(StackAlignmentInBytes));

       // unlike x86 we need no specialized return from compiled code
       // to the interpreter or the call stub.

       // push the return address
       __ push(retaddr);

       // and begin the OSR nmethod
       __ jmp(Address(r13, nmethod::osr_entry_point_offset()));
     }
   }
 }


 void TemplateTable::if_0cmp(Condition cc) {
   transition(itos, vtos);
   // assume branch is more often taken than not (loops use backward branches)
   Label not_taken;
   __ testl(rax, rax);
   __ jcc(j_not(cc), not_taken);
   branch(false, false);
   __ bind(not_taken);
   __ profile_not_taken_branch(rax);
 }

 void TemplateTable::if_icmp(Condition cc) {
   transition(itos, vtos);
   // assume branch is more often taken than not (loops use backward branches)
   Label not_taken;
   __ pop_i(rdx);
   __ cmpl(rdx, rax);
   __ jcc(j_not(cc), not_taken);
   branch(false, false);
   __ bind(not_taken);
   __ profile_not_taken_branch(rax);
 }

 void TemplateTable::if_nullcmp(Condition cc) {
   transition(atos, vtos);
   // assume branch is more often taken than not (loops use backward branches)
   Label not_taken;
   __ testptr(rax, rax);
   __ jcc(j_not(cc), not_taken);
   branch(false, false);
   __ bind(not_taken);
   __ profile_not_taken_branch(rax);
 }

 void TemplateTable::if_acmp(Condition cc) {
   transition(atos, vtos);
   // assume branch is more often taken than not (loops use backward branches)
   Label not_taken;
   __ pop_ptr(rdx);
   __ cmpptr(rdx, rax);
   __ jcc(j_not(cc), not_taken);
   branch(false, false);
   __ bind(not_taken);
   __ profile_not_taken_branch(rax);
 }

 void TemplateTable::ret() {
   transition(vtos, vtos);
   locals_index(rbx);
   __ movslq(rbx, iaddress(rbx)); // get return bci, compute return bcp
   __ profile_ret(rbx, rcx);
   __ get_method(rax);
   __ movptr(r13, Address(rax, Method::const_offset()));
   __ lea(r13, Address(r13, rbx, Address::times_1,
                       ConstMethod::codes_offset()));
   __ dispatch_next(vtos);
 }

 void TemplateTable::wide_ret() {
   transition(vtos, vtos);
   locals_index_wide(rbx);
   __ movptr(rbx, aaddress(rbx)); // get return bci, compute return bcp
   __ profile_ret(rbx, rcx);
   __ get_method(rax);
   __ movptr(r13, Address(rax, Method::const_offset()));
   __ lea(r13, Address(r13, rbx, Address::times_1, ConstMethod::codes_offset()));
   __ dispatch_next(vtos);
 }

 void TemplateTable::tableswitch() {
   Label default_case, continue_execution;
   transition(itos, vtos);
   // align r13
   __ lea(rbx, at_bcp(BytesPerInt));
   __ andptr(rbx, -BytesPerInt);
   // load lo & hi
   __ movl(rcx, Address(rbx, BytesPerInt));
   __ movl(rdx, Address(rbx, 2 * BytesPerInt));
   __ bswapl(rcx);
   __ bswapl(rdx);
   // check against lo & hi
   __ cmpl(rax, rcx);
   __ jcc(Assembler::less, default_case);
   __ cmpl(rax, rdx);
   __ jcc(Assembler::greater, default_case);
   // lookup dispatch offset
   __ subl(rax, rcx);
   __ movl(rdx, Address(rbx, rax, Address::times_4, 3 * BytesPerInt));
   __ profile_switch_case(rax, rbx, rcx);
   // continue execution
   __ bind(continue_execution);
   __ bswapl(rdx);
   __ movl2ptr(rdx, rdx);
   __ load_unsigned_byte(rbx, Address(r13, rdx, Address::times_1));
   __ addptr(r13, rdx);
   __ dispatch_only(vtos);
   // handle default
   __ bind(default_case);
   __ profile_switch_default(rax);
   __ movl(rdx, Address(rbx, 0));
   __ jmp(continue_execution);
 }

 void TemplateTable::lookupswitch() {
   transition(itos, itos);
   __ stop("lookupswitch bytecode should have been rewritten");
 }

 void TemplateTable::fast_linearswitch() {
   transition(itos, vtos);
   Label loop_entry, loop, found, continue_execution;
   // bswap rax so we can avoid bswapping the table entries
   __ bswapl(rax);
   // align r13
   __ lea(rbx, at_bcp(BytesPerInt)); // btw: should be able to get rid of
                                     // this instruction (change offsets
                                     // below)
   __ andptr(rbx, -BytesPerInt);
   // set counter
   __ movl(rcx, Address(rbx, BytesPerInt));
   __ bswapl(rcx);
   __ jmpb(loop_entry);
   // table search
   __ bind(loop);
   __ cmpl(rax, Address(rbx, rcx, Address::times_8, 2 * BytesPerInt));
   __ jcc(Assembler::equal, found);
   __ bind(loop_entry);
   __ decrementl(rcx);
   __ jcc(Assembler::greaterEqual, loop);
   // default case
   __ profile_switch_default(rax);
   __ movl(rdx, Address(rbx, 0));
   __ jmp(continue_execution);
   // entry found -> get offset
   __ bind(found);
   __ movl(rdx, Address(rbx, rcx, Address::times_8, 3 * BytesPerInt));
   __ profile_switch_case(rcx, rax, rbx);
   // continue execution
   __ bind(continue_execution);
   __ bswapl(rdx);
   __ movl2ptr(rdx, rdx);
   __ load_unsigned_byte(rbx, Address(r13, rdx, Address::times_1));
   __ addptr(r13, rdx);
   __ dispatch_only(vtos);
 }

 void TemplateTable::fast_binaryswitch() {
   transition(itos, vtos);
   // Implementation using the following core algorithm:
   //
   // int binary_search(int key, LookupswitchPair* array, int n) {
   //   // Binary search according to "Methodik des Programmierens" by
   //   // Edsger W. Dijkstra and W.H.J. Feijen, Addison Wesley Germany 1985.
   //   int i = 0;
   //   int j = n;
   //   while (i+1 < j) {
   //     // invariant P: 0 <= i < j <= n and (a[i] <= key < a[j] or Q)
   //     // with      Q: for all i: 0 <= i < n: key < a[i]
   //     // where a stands for the array and assuming that the (inexisting)
   //     // element a[n] is infinitely big.
   //     int h = (i + j) >> 1;
   //     // i < h < j
   //     if (key < array[h].fast_match()) {
   //       j = h;
   //     } else {
   //       i = h;
   //     }
   //   }
   //   // R: a[i] <= key < a[i+1] or Q
   //   // (i.e., if key is within array, i is the correct index)
   //   return i;
   // }

   // Register allocation
   const Register key   = rax; // already set (tosca)
   const Register array = rbx;
   const Register i     = rcx;
   const Register j     = rdx;
   const Register h     = rdi;
   const Register temp  = rsi;

   // Find array start
   __ lea(array, at_bcp(3 * BytesPerInt)); // btw: should be able to
                                           // get rid of this
                                           // instruction (change
                                           // offsets below)
   __ andptr(array, -BytesPerInt);

   // Initialize i & j
   __ xorl(i, i);                            // i = 0;
   __ movl(j, Address(array, -BytesPerInt)); // j = length(array);

   // Convert j into native byteordering
   __ bswapl(j);

   // And start
   Label entry;
   __ jmp(entry);

   // binary search loop
   {
     Label loop;
     __ bind(loop);
     // int h = (i + j) >> 1;
     __ leal(h, Address(i, j, Address::times_1)); // h = i + j;
     __ sarl(h, 1);                               // h = (i + j) >> 1;
     // if (key < array[h].fast_match()) {
     //   j = h;
     // } else {
     //   i = h;
     // }
     // Convert array[h].match to native byte-ordering before compare
     __ movl(temp, Address(array, h, Address::times_8));
     __ bswapl(temp);
     __ cmpl(key, temp);
     // j = h if (key <  array[h].fast_match())
     __ cmovl(Assembler::less, j, h);
     // i = h if (key >= array[h].fast_match())
     __ cmovl(Assembler::greaterEqual, i, h);
     // while (i+1 < j)
     __ bind(entry);
     __ leal(h, Address(i, 1)); // i+1
     __ cmpl(h, j);             // i+1 < j
     __ jcc(Assembler::less, loop);
   }

   // end of binary search, result index is i (must check again!)
   Label default_case;
   // Convert array[i].match to native byte-ordering before compare
   __ movl(temp, Address(array, i, Address::times_8));
   __ bswapl(temp);
   __ cmpl(key, temp);
   __ jcc(Assembler::notEqual, default_case);

   // entry found -> j = offset
   __ movl(j , Address(array, i, Address::times_8, BytesPerInt));
   __ profile_switch_case(i, key, array);
   __ bswapl(j);
   __ movl2ptr(j, j);
   __ load_unsigned_byte(rbx, Address(r13, j, Address::times_1));
   __ addptr(r13, j);
   __ dispatch_only(vtos);

   // default case -> j = default offset
   __ bind(default_case);
   __ profile_switch_default(i);
   __ movl(j, Address(array, -2 * BytesPerInt));
   __ bswapl(j);
   __ movl2ptr(j, j);
   __ load_unsigned_byte(rbx, Address(r13, j, Address::times_1));
   __ addptr(r13, j);
   __ dispatch_only(vtos);
 }


 void TemplateTable::_return(TosState state) {
   transition(state, state);
   assert(_desc->calls_vm(),
          "inconsistent calls_vm information"); // call in remove_activation

   if (_desc->bytecode() == Bytecodes::_return_register_finalizer) {
     assert(state == vtos, "only valid state");
     __ movptr(c_rarg1, aaddress(0));
     __ load_klass(rdi, c_rarg1);
     __ movl(rdi, Address(rdi, Klass::access_flags_offset()));
     __ testl(rdi, JVM_ACC_HAS_FINALIZER);
     Label skip_register_finalizer;
     __ jcc(Assembler::zero, skip_register_finalizer);

     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::register_finalizer), c_rarg1);

     __ bind(skip_register_finalizer);
   }

   // Narrow result if state is itos but result type is smaller.
   // Need to narrow in the return bytecode rather than in generate_return_entry
   // since compiled code callers expect the result to already be narrowed.
   if (state == itos) {
     __ narrow(rax);
   }
   __ remove_activation(state, r13);

   __ jmp(r13);
 }

 // ----------------------------------------------------------------------------
 // Volatile variables demand their effects be made known to all CPU's
 // in order.  Store buffers on most chips allow reads & writes to
 // reorder; the JMM's ReadAfterWrite.java test fails in -Xint mode
 // without some kind of memory barrier (i.e., it's not sufficient that
 // the interpreter does not reorder volatile references, the hardware
 // also must not reorder them).
 //
 // According to the new Java Memory Model (JMM):
 // (1) All volatiles are serialized wrt to each other.  ALSO reads &
 //     writes act as aquire & release, so:
 // (2) A read cannot let unrelated NON-volatile memory refs that
 //     happen after the read float up to before the read.  It's OK for
 //     non-volatile memory refs that happen before the volatile read to
 //     float down below it.
 // (3) Similar a volatile write cannot let unrelated NON-volatile
 //     memory refs that happen BEFORE the write float down to after the
 //     write.  It's OK for non-volatile memory refs that happen after the
 //     volatile write to float up before it.
 //
 // We only put in barriers around volatile refs (they are expensive),
 // not _between_ memory refs (that would require us to track the
 // flavor of the previous memory refs).  Requirements (2) and (3)
 // require some barriers before volatile stores and after volatile
 // loads.  These nearly cover requirement (1) but miss the
 // volatile-store-volatile-load case.  This final case is placed after
 // volatile-stores although it could just as well go before
 // volatile-loads.
 void TemplateTable::volatile_barrier(Assembler::Membar_mask_bits
                                      order_constraint) {
   // Helper function to insert a is-volatile test and memory barrier
   if (os::is_MP()) { // Not needed on single CPU
     __ membar(order_constraint);
   }
 }

 void TemplateTable::resolve_cache_and_index(int byte_no,
                                             Register Rcache,
                                             Register index,
                                             size_t index_size) {
   const Register temp = rbx;
   assert_different_registers(Rcache, index, temp);

   Label resolved;
     assert(byte_no == f1_byte || byte_no == f2_byte, "byte_no out of range");
     __ get_cache_and_index_and_bytecode_at_bcp(Rcache, index, temp, byte_no, 1, index_size);
     __ cmpl(temp, (int) bytecode());  // have we resolved this bytecode?
     __ jcc(Assembler::equal, resolved);

   // resolve first time through
   address entry;
   switch (bytecode()) {
   case Bytecodes::_getstatic:
   case Bytecodes::_putstatic:
   case Bytecodes::_getfield:
   case Bytecodes::_putfield:
     entry = CAST_FROM_FN_PTR(address, InterpreterRuntime::resolve_get_put);
     break;
   case Bytecodes::_invokevirtual:
   case Bytecodes::_invokespecial:
   case Bytecodes::_invokestatic:
   case Bytecodes::_invokeinterface:
     entry = CAST_FROM_FN_PTR(address, InterpreterRuntime::resolve_invoke);
     break;
   case Bytecodes::_invokehandle:
     entry = CAST_FROM_FN_PTR(address, InterpreterRuntime::resolve_invokehandle);
     break;
   case Bytecodes::_invokedynamic:
     entry = CAST_FROM_FN_PTR(address, InterpreterRuntime::resolve_invokedynamic);
     break;
   default:
     fatal(err_msg("unexpected bytecode: %s", Bytecodes::name(bytecode())));
     break;
   }
   __ movl(temp, (int) bytecode());
   __ call_VM(noreg, entry, temp);

   // Update registers with resolved info
   __ get_cache_and_index_at_bcp(Rcache, index, 1, index_size);
   __ bind(resolved);
 }

 // The cache and index registers must be set before call
 void TemplateTable::load_field_cp_cache_entry(Register obj,
                                               Register cache,
                                               Register index,
                                               Register off,
                                               Register flags,
                                               bool is_static = false) {
   assert_different_registers(cache, index, flags, off);

   ByteSize cp_base_offset = ConstantPoolCache::base_offset();
   // Field offset
   __ movptr(off, Address(cache, index, Address::times_ptr,
                          in_bytes(cp_base_offset +
                                   ConstantPoolCacheEntry::f2_offset())));
   // Flags
   __ movl(flags, Address(cache, index, Address::times_ptr,
                          in_bytes(cp_base_offset +
                                   ConstantPoolCacheEntry::flags_offset())));

   // klass overwrite register
   if (is_static) {
     __ movptr(obj, Address(cache, index, Address::times_ptr,
                            in_bytes(cp_base_offset +
                                     ConstantPoolCacheEntry::f1_offset())));
     const int mirror_offset = in_bytes(Klass::java_mirror_offset());
     __ movptr(obj, Address(obj, mirror_offset));
   }
 }

 void TemplateTable::load_invoke_cp_cache_entry(int byte_no,
                                                Register method,
                                                Register itable_index,
                                                Register flags,
                                                bool is_invokevirtual,
                                                bool is_invokevfinal, /*unused*/
                                                bool is_invokedynamic) {
   // setup registers
   const Register cache = rcx;
   const Register index = rdx;
   assert_different_registers(method, flags);
   assert_different_registers(method, cache, index);
   assert_different_registers(itable_index, flags);
   assert_different_registers(itable_index, cache, index);
   // determine constant pool cache field offsets
   assert(is_invokevirtual == (byte_no == f2_byte), "is_invokevirtual flag redundant");
   const int method_offset = in_bytes(
     ConstantPoolCache::base_offset() +
       ((byte_no == f2_byte)
        ? ConstantPoolCacheEntry::f2_offset()
        : ConstantPoolCacheEntry::f1_offset()));
   const int flags_offset = in_bytes(ConstantPoolCache::base_offset() +
                                     ConstantPoolCacheEntry::flags_offset());
   // access constant pool cache fields
   const int index_offset = in_bytes(ConstantPoolCache::base_offset() +
                                     ConstantPoolCacheEntry::f2_offset());

   size_t index_size = (is_invokedynamic ? sizeof(u4) : sizeof(u2));
   resolve_cache_and_index(byte_no, cache, index, index_size);
     __ movptr(method, Address(cache, index, Address::times_ptr, method_offset));

   if (itable_index != noreg) {
     // pick up itable or appendix index from f2 also:
     __ movptr(itable_index, Address(cache, index, Address::times_ptr, index_offset));
   }
   __ movl(flags, Address(cache, index, Address::times_ptr, flags_offset));
 }

 // Correct values of the cache and index registers are preserved.
 void TemplateTable::jvmti_post_field_access(Register cache, Register index,
                                             bool is_static, bool has_tos) {
   // do the JVMTI work here to avoid disturbing the register state below
   // We use c_rarg registers here because we want to use the register used in
   // the call to the VM
   if (JvmtiExport::can_post_field_access()) {
     // Check to see if a field access watch has been set before we
     // take the time to call into the VM.
     Label L1;
     assert_different_registers(cache, index, rax);
     __ mov32(rax, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
     __ testl(rax, rax);
     __ jcc(Assembler::zero, L1);

     __ get_cache_and_index_at_bcp(c_rarg2, c_rarg3, 1);

     // cache entry pointer
     __ addptr(c_rarg2, in_bytes(ConstantPoolCache::base_offset()));
     __ shll(c_rarg3, LogBytesPerWord);
     __ addptr(c_rarg2, c_rarg3);
     if (is_static) {
       __ xorl(c_rarg1, c_rarg1); // NULL object reference
     } else {
       __ movptr(c_rarg1, at_tos()); // get object pointer without popping it
       __ verify_oop(c_rarg1);
     }
     // c_rarg1: object pointer or NULL
     // c_rarg2: cache entry pointer
     // c_rarg3: jvalue object on the stack
     __ call_VM(noreg, CAST_FROM_FN_PTR(address,
                                        InterpreterRuntime::post_field_access),
                c_rarg1, c_rarg2, c_rarg3);
     __ get_cache_and_index_at_bcp(cache, index, 1);
     __ bind(L1);
   }
 }

 void TemplateTable::pop_and_check_object(Register r) {
   __ pop_ptr(r);
   __ null_check(r);  // for field access must check obj.
   __ verify_oop(r);
 }

 void TemplateTable::getfield_or_static(int byte_no, bool is_static) {
   transition(vtos, vtos);

   const Register cache = rcx;
   const Register index = rdx;
   const Register obj   = c_rarg3;
   const Register off   = rbx;
   const Register flags = rax;
   const Register bc = c_rarg3; // uses same reg as obj, so don't mix them

   resolve_cache_and_index(byte_no, cache, index, sizeof(u2));
   jvmti_post_field_access(cache, index, is_static, false);
   load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);

   if (!is_static) {
     // obj is on the stack
     pop_and_check_object(obj);
   }

   const Address field(obj, off, Address::times_1);

   Label Done, notByte, notBool, notInt, notShort, notChar,
               notLong, notFloat, notObj, notDouble;

   __ shrl(flags, ConstantPoolCacheEntry::tos_state_shift);
   // Make sure we don't need to mask edx after the above shift
   assert(btos == 0, "change code, btos != 0");

   __ andl(flags, ConstantPoolCacheEntry::tos_state_mask);
   __ jcc(Assembler::notZero, notByte);
   // btos
   __ load_signed_byte(rax, field);
   __ push(btos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_bgetfield, bc, rbx);
   }
   __ jmp(Done);

   __ bind(notByte);
   __ cmpl(flags, ztos);
   __ jcc(Assembler::notEqual, notBool);

   // ztos (same code as btos)
   __ load_signed_byte(rax, field);
   __ push(ztos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     // use btos rewriting, no truncating to t/f bit is needed for getfield.
     patch_bytecode(Bytecodes::_fast_bgetfield, bc, rbx);
   }
   __ jmp(Done);

   __ bind(notBool);
   __ cmpl(flags, atos);
   __ jcc(Assembler::notEqual, notObj);
   // atos
   __ load_heap_oop(rax, field);
   __ push(atos);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_agetfield, bc, rbx);
   }
   __ jmp(Done);

   __ bind(notObj);
   __ cmpl(flags, itos);
   __ jcc(Assembler::notEqual, notInt);
   // itos
   __ movl(rax, field);
   __ push(itos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_igetfield, bc, rbx);
   }
   __ jmp(Done);

   __ bind(notInt);
   __ cmpl(flags, ctos);
   __ jcc(Assembler::notEqual, notChar);
   // ctos
   __ load_unsigned_short(rax, field);
   __ push(ctos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_cgetfield, bc, rbx);
   }
   __ jmp(Done);

   __ bind(notChar);
   __ cmpl(flags, stos);
   __ jcc(Assembler::notEqual, notShort);
   // stos
   __ load_signed_short(rax, field);
   __ push(stos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_sgetfield, bc, rbx);
   }
   __ jmp(Done);

   __ bind(notShort);
   __ cmpl(flags, ltos);
   __ jcc(Assembler::notEqual, notLong);
   // ltos
   __ movq(rax, field);
   __ push(ltos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_lgetfield, bc, rbx);
   }
   __ jmp(Done);

   __ bind(notLong);
   __ cmpl(flags, ftos);
   __ jcc(Assembler::notEqual, notFloat);
   // ftos
   __ movflt(xmm0, field);
   __ push(ftos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_fgetfield, bc, rbx);
   }
   __ jmp(Done);

   __ bind(notFloat);
 #ifdef ASSERT
   __ cmpl(flags, dtos);
   __ jcc(Assembler::notEqual, notDouble);
 #endif
   // dtos
   __ movdbl(xmm0, field);
   __ push(dtos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_dgetfield, bc, rbx);
   }
 #ifdef ASSERT
   __ jmp(Done);

   __ bind(notDouble);
   __ stop("Bad state");
 #endif

   __ bind(Done);
   // [jk] not needed currently
   // volatile_barrier(Assembler::Membar_mask_bits(Assembler::LoadLoad |
   //                                              Assembler::LoadStore));
 }


 void TemplateTable::getfield(int byte_no) {
   getfield_or_static(byte_no, false);
 }

 void TemplateTable::getstatic(int byte_no) {
   getfield_or_static(byte_no, true);
 }

 // The registers cache and index expected to be set before call.
 // The function may destroy various registers, just not the cache and index registers.
 void TemplateTable::jvmti_post_field_mod(Register cache, Register index, bool is_static) {
   transition(vtos, vtos);

   ByteSize cp_base_offset = ConstantPoolCache::base_offset();

   if (JvmtiExport::can_post_field_modification()) {
     // Check to see if a field modification watch has been set before
     // we take the time to call into the VM.
     Label L1;
     assert_different_registers(cache, index, rax);
     __ mov32(rax, ExternalAddress((address)JvmtiExport::get_field_modification_count_addr()));
     __ testl(rax, rax);
     __ jcc(Assembler::zero, L1);

     __ get_cache_and_index_at_bcp(c_rarg2, rscratch1, 1);

     if (is_static) {
       // Life is simple.  Null out the object pointer.
       __ xorl(c_rarg1, c_rarg1);
     } else {
       // Life is harder. The stack holds the value on top, followed by
       // the object.  We don't know the size of the value, though; it
       // could be one or two words depending on its type. As a result,
       // we must find the type to determine where the object is.
       __ movl(c_rarg3, Address(c_rarg2, rscratch1,
                            Address::times_8,
                            in_bytes(cp_base_offset +
                                      ConstantPoolCacheEntry::flags_offset())));
       __ shrl(c_rarg3, ConstantPoolCacheEntry::tos_state_shift);
       // Make sure we don't need to mask rcx after the above shift
       ConstantPoolCacheEntry::verify_tos_state_shift();
       __ movptr(c_rarg1, at_tos_p1());  // initially assume a one word jvalue
       __ cmpl(c_rarg3, ltos);
       __ cmovptr(Assembler::equal,
                  c_rarg1, at_tos_p2()); // ltos (two word jvalue)
       __ cmpl(c_rarg3, dtos);
       __ cmovptr(Assembler::equal,
                  c_rarg1, at_tos_p2()); // dtos (two word jvalue)
     }
     // cache entry pointer
     __ addptr(c_rarg2, in_bytes(cp_base_offset));
     __ shll(rscratch1, LogBytesPerWord);
     __ addptr(c_rarg2, rscratch1);
     // object (tos)
     __ mov(c_rarg3, rsp);
     // c_rarg1: object pointer set up above (NULL if static)
     // c_rarg2: cache entry pointer
     // c_rarg3: jvalue object on the stack
     __ call_VM(noreg,
                CAST_FROM_FN_PTR(address,
                                 InterpreterRuntime::post_field_modification),
                c_rarg1, c_rarg2, c_rarg3);
     __ get_cache_and_index_at_bcp(cache, index, 1);
     __ bind(L1);
   }
 }

 void TemplateTable::putfield_or_static(int byte_no, bool is_static) {
   transition(vtos, vtos);

   const Register cache = rcx;
   const Register index = rdx;
   const Register obj   = rcx;
   const Register off   = rbx;
   const Register flags = rax;
   const Register bc    = c_rarg3;

   resolve_cache_and_index(byte_no, cache, index, sizeof(u2));
   jvmti_post_field_mod(cache, index, is_static);
   load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);

   // [jk] not needed currently
   // volatile_barrier(Assembler::Membar_mask_bits(Assembler::LoadStore |
   //                                              Assembler::StoreStore));

   Label notVolatile, Done;
   __ movl(rdx, flags);
   __ shrl(rdx, ConstantPoolCacheEntry::is_volatile_shift);
   __ andl(rdx, 0x1);

   // field address
   const Address field(obj, off, Address::times_1);

   Label notByte, notBool, notInt, notShort, notChar,
         notLong, notFloat, notObj, notDouble;

   __ shrl(flags, ConstantPoolCacheEntry::tos_state_shift);

   assert(btos == 0, "change code, btos != 0");
   __ andl(flags, ConstantPoolCacheEntry::tos_state_mask);
   __ jcc(Assembler::notZero, notByte);

   // btos
   {
     __ pop(btos);
     if (!is_static) pop_and_check_object(obj);
     __ movb(field, rax);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_bputfield, bc, rbx, true, byte_no);
     }
     __ jmp(Done);
   }

   __ bind(notByte);
   __ cmpl(flags, ztos);
   __ jcc(Assembler::notEqual, notBool);

   // ztos
   {
     __ pop(ztos);
     if (!is_static) pop_and_check_object(obj);
     __ andl(rax, 0x1);
     __ movb(field, rax);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_zputfield, bc, rbx, true, byte_no);
     }
     __ jmp(Done);
   }

   __ bind(notBool);
   __ cmpl(flags, atos);
   __ jcc(Assembler::notEqual, notObj);

   // atos
   {
     __ pop(atos);
     if (!is_static) pop_and_check_object(obj);
     // Store into the field
     do_oop_store(_masm, field, rax, _bs->kind(), false);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_aputfield, bc, rbx, true, byte_no);
     }
     __ jmp(Done);
   }

   __ bind(notObj);
   __ cmpl(flags, itos);
   __ jcc(Assembler::notEqual, notInt);

   // itos
   {
     __ pop(itos);
     if (!is_static) pop_and_check_object(obj);
     __ movl(field, rax);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_iputfield, bc, rbx, true, byte_no);
     }
     __ jmp(Done);
   }

   __ bind(notInt);
   __ cmpl(flags, ctos);
   __ jcc(Assembler::notEqual, notChar);

   // ctos
   {
     __ pop(ctos);
     if (!is_static) pop_and_check_object(obj);
     __ movw(field, rax);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_cputfield, bc, rbx, true, byte_no);
     }
     __ jmp(Done);
   }

   __ bind(notChar);
   __ cmpl(flags, stos);
   __ jcc(Assembler::notEqual, notShort);

   // stos
   {
     __ pop(stos);
     if (!is_static) pop_and_check_object(obj);
     __ movw(field, rax);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_sputfield, bc, rbx, true, byte_no);
     }
     __ jmp(Done);
   }

   __ bind(notShort);
   __ cmpl(flags, ltos);
   __ jcc(Assembler::notEqual, notLong);

   // ltos
   {
     __ pop(ltos);
     if (!is_static) pop_and_check_object(obj);
     __ movq(field, rax);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_lputfield, bc, rbx, true, byte_no);
     }
     __ jmp(Done);
   }

   __ bind(notLong);
   __ cmpl(flags, ftos);
   __ jcc(Assembler::notEqual, notFloat);

   // ftos
   {
     __ pop(ftos);
     if (!is_static) pop_and_check_object(obj);
     __ movflt(field, xmm0);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_fputfield, bc, rbx, true, byte_no);
     }
     __ jmp(Done);
   }

   __ bind(notFloat);
 #ifdef ASSERT
   __ cmpl(flags, dtos);
   __ jcc(Assembler::notEqual, notDouble);
 #endif

   // dtos
   {
     __ pop(dtos);
     if (!is_static) pop_and_check_object(obj);
     __ movdbl(field, xmm0);
     if (!is_static) {
       patch_bytecode(Bytecodes::_fast_dputfield, bc, rbx, true, byte_no);
     }
   }

 #ifdef ASSERT
   __ jmp(Done);

   __ bind(notDouble);
   __ stop("Bad state");
 #endif

   __ bind(Done);

   // Check for volatile store
   __ testl(rdx, rdx);
   __ jcc(Assembler::zero, notVolatile);
   volatile_barrier(Assembler::Membar_mask_bits(Assembler::StoreLoad |
                                                Assembler::StoreStore));
   __ bind(notVolatile);
 }

 void TemplateTable::putfield(int byte_no) {
   putfield_or_static(byte_no, false);
 }

 void TemplateTable::putstatic(int byte_no) {
   putfield_or_static(byte_no, true);
 }

 void TemplateTable::jvmti_post_fast_field_mod() {
   if (JvmtiExport::can_post_field_modification()) {
     // Check to see if a field modification watch has been set before
     // we take the time to call into the VM.
     Label L2;
     __ mov32(c_rarg3, ExternalAddress((address)JvmtiExport::get_field_modification_count_addr()));
     __ testl(c_rarg3, c_rarg3);
     __ jcc(Assembler::zero, L2);
     __ pop_ptr(rbx);                  // copy the object pointer from tos
     __ verify_oop(rbx);
     __ push_ptr(rbx);                 // put the object pointer back on tos
     // Save tos values before call_VM() clobbers them. Since we have
     // to do it for every data type, we use the saved values as the
     // jvalue object.
     switch (bytecode()) {          // load values into the jvalue object
     case Bytecodes::_fast_aputfield: __ push_ptr(rax); break;
     case Bytecodes::_fast_bputfield: // fall through
     case Bytecodes::_fast_zputfield: // fall through
     case Bytecodes::_fast_sputfield: // fall through
     case Bytecodes::_fast_cputfield: // fall through
     case Bytecodes::_fast_iputfield: __ push_i(rax); break;
     case Bytecodes::_fast_dputfield: __ push_d(); break;
     case Bytecodes::_fast_fputfield: __ push_f(); break;
     case Bytecodes::_fast_lputfield: __ push_l(rax); break;

     default:
       ShouldNotReachHere();
     }
     __ mov(c_rarg3, rsp);             // points to jvalue on the stack
     // access constant pool cache entry
     __ get_cache_entry_pointer_at_bcp(c_rarg2, rax, 1);
     __ verify_oop(rbx);
     // rbx: object pointer copied above
     // c_rarg2: cache entry pointer
     // c_rarg3: jvalue object on the stack
     __ call_VM(noreg,
                CAST_FROM_FN_PTR(address,
                                 InterpreterRuntime::post_field_modification),
                rbx, c_rarg2, c_rarg3);

     switch (bytecode()) {             // restore tos values
     case Bytecodes::_fast_aputfield: __ pop_ptr(rax); break;
     case Bytecodes::_fast_bputfield: // fall through
     case Bytecodes::_fast_zputfield: // fall through
     case Bytecodes::_fast_sputfield: // fall through
     case Bytecodes::_fast_cputfield: // fall through
     case Bytecodes::_fast_iputfield: __ pop_i(rax); break;
     case Bytecodes::_fast_dputfield: __ pop_d(); break;
     case Bytecodes::_fast_fputfield: __ pop_f(); break;
     case Bytecodes::_fast_lputfield: __ pop_l(rax); break;
     }
     __ bind(L2);
   }
 }

 void TemplateTable::fast_storefield(TosState state) {
   transition(state, vtos);

   ByteSize base = ConstantPoolCache::base_offset();

   jvmti_post_fast_field_mod();

   // access constant pool cache
   __ get_cache_and_index_at_bcp(rcx, rbx, 1);

   // test for volatile with rdx
   __ movl(rdx, Address(rcx, rbx, Address::times_8,
                        in_bytes(base +
                                 ConstantPoolCacheEntry::flags_offset())));

   // replace index with field offset from cache entry
   __ movptr(rbx, Address(rcx, rbx, Address::times_8,
                          in_bytes(base + ConstantPoolCacheEntry::f2_offset())));

   // [jk] not needed currently
   // volatile_barrier(Assembler::Membar_mask_bits(Assembler::LoadStore |
   //                                              Assembler::StoreStore));

   Label notVolatile;
   __ shrl(rdx, ConstantPoolCacheEntry::is_volatile_shift);
   __ andl(rdx, 0x1);

   // Get object from stack
   pop_and_check_object(rcx);

   // field address
   const Address field(rcx, rbx, Address::times_1);

   // access field
   switch (bytecode()) {
   case Bytecodes::_fast_aputfield:
     do_oop_store(_masm, field, rax, _bs->kind(), false);
     break;
   case Bytecodes::_fast_lputfield:
     __ movq(field, rax);
     break;
   case Bytecodes::_fast_iputfield:
     __ movl(field, rax);
     break;
   case Bytecodes::_fast_zputfield:
     __ andl(rax, 0x1);  // boolean is true if LSB is 1
     // fall through to bputfield
   case Bytecodes::_fast_bputfield:
     __ movb(field, rax);
     break;
   case Bytecodes::_fast_sputfield:
     // fall through
   case Bytecodes::_fast_cputfield:
     __ movw(field, rax);
     break;
   case Bytecodes::_fast_fputfield:
     __ movflt(field, xmm0);
     break;
   case Bytecodes::_fast_dputfield:
     __ movdbl(field, xmm0);
     break;
   default:
     ShouldNotReachHere();
   }

   // Check for volatile store
   __ testl(rdx, rdx);
   __ jcc(Assembler::zero, notVolatile);
   volatile_barrier(Assembler::Membar_mask_bits(Assembler::StoreLoad |
                                                Assembler::StoreStore));
   __ bind(notVolatile);
 }


 void TemplateTable::fast_accessfield(TosState state) {
   transition(atos, state);

   // Do the JVMTI work here to avoid disturbing the register state below
   if (JvmtiExport::can_post_field_access()) {
     // Check to see if a field access watch has been set before we
     // take the time to call into the VM.
     Label L1;
     __ mov32(rcx, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
     __ testl(rcx, rcx);
     __ jcc(Assembler::zero, L1);
     // access constant pool cache entry
     __ get_cache_entry_pointer_at_bcp(c_rarg2, rcx, 1);
     __ verify_oop(rax);
     __ push_ptr(rax);  // save object pointer before call_VM() clobbers it
     __ mov(c_rarg1, rax);
     // c_rarg1: object pointer copied above
     // c_rarg2: cache entry pointer
     __ call_VM(noreg,
                CAST_FROM_FN_PTR(address,
                                 InterpreterRuntime::post_field_access),
                c_rarg1, c_rarg2);
     __ pop_ptr(rax); // restore object pointer
     __ bind(L1);
   }

   // access constant pool cache
   __ get_cache_and_index_at_bcp(rcx, rbx, 1);
   // replace index with field offset from cache entry
   // [jk] not needed currently
   // if (os::is_MP()) {
   //   __ movl(rdx, Address(rcx, rbx, Address::times_8,
   //                        in_bytes(ConstantPoolCache::base_offset() +
   //                                 ConstantPoolCacheEntry::flags_offset())));
   //   __ shrl(rdx, ConstantPoolCacheEntry::is_volatile_shift);
   //   __ andl(rdx, 0x1);
   // }
   __ movptr(rbx, Address(rcx, rbx, Address::times_8,
                          in_bytes(ConstantPoolCache::base_offset() +
                                   ConstantPoolCacheEntry::f2_offset())));

   // rax: object
   __ verify_oop(rax);
   __ null_check(rax);
   Address field(rax, rbx, Address::times_1);

   // access field
   switch (bytecode()) {
   case Bytecodes::_fast_agetfield:
     __ load_heap_oop(rax, field);
     __ verify_oop(rax);
     break;
   case Bytecodes::_fast_lgetfield:
     __ movq(rax, field);
     break;
   case Bytecodes::_fast_igetfield:
     __ movl(rax, field);
     break;
   case Bytecodes::_fast_bgetfield:
     __ movsbl(rax, field);
     break;
   case Bytecodes::_fast_sgetfield:
     __ load_signed_short(rax, field);
     break;
   case Bytecodes::_fast_cgetfield:
     __ load_unsigned_short(rax, field);
     break;
   case Bytecodes::_fast_fgetfield:
     __ movflt(xmm0, field);
     break;
   case Bytecodes::_fast_dgetfield:
     __ movdbl(xmm0, field);
     break;
   default:
     ShouldNotReachHere();
   }
   // [jk] not needed currently
   // if (os::is_MP()) {
   //   Label notVolatile;
   //   __ testl(rdx, rdx);
   //   __ jcc(Assembler::zero, notVolatile);
   //   __ membar(Assembler::LoadLoad);
   //   __ bind(notVolatile);
   //};
 }

 void TemplateTable::fast_xaccess(TosState state) {
   transition(vtos, state);

   // get receiver
   __ movptr(rax, aaddress(0));
   // access constant pool cache
   __ get_cache_and_index_at_bcp(rcx, rdx, 2);
   __ movptr(rbx,
             Address(rcx, rdx, Address::times_8,
                     in_bytes(ConstantPoolCache::base_offset() +
                              ConstantPoolCacheEntry::f2_offset())));
   // make sure exception is reported in correct bcp range (getfield is
   // next instruction)
   __ increment(r13);
   __ null_check(rax);
   switch (state) {
   case itos:
     __ movl(rax, Address(rax, rbx, Address::times_1));
     break;
   case atos:
     __ load_heap_oop(rax, Address(rax, rbx, Address::times_1));
     __ verify_oop(rax);
     break;
   case ftos:
     __ movflt(xmm0, Address(rax, rbx, Address::times_1));
     break;
   default:
     ShouldNotReachHere();
   }

   // [jk] not needed currently
   // if (os::is_MP()) {
   //   Label notVolatile;
   //   __ movl(rdx, Address(rcx, rdx, Address::times_8,
   //                        in_bytes(ConstantPoolCache::base_offset() +
   //                                 ConstantPoolCacheEntry::flags_offset())));
   //   __ shrl(rdx, ConstantPoolCacheEntry::is_volatile_shift);
   //   __ testl(rdx, 0x1);
   //   __ jcc(Assembler::zero, notVolatile);
   //   __ membar(Assembler::LoadLoad);
   //   __ bind(notVolatile);
   // }

   __ decrement(r13);
 }


 //-----------------------------------------------------------------------------
 // Calls

 void TemplateTable::count_calls(Register method, Register temp) {
   // implemented elsewhere
   ShouldNotReachHere();
 }

 void TemplateTable::prepare_invoke(int byte_no,
                                    Register method,  // linked method (or i-klass)
                                    Register index,   // itable index, MethodType, etc.
                                    Register recv,    // if caller wants to see it
                                    Register flags    // if caller wants to test it
                                    ) {
   // determine flags
   const Bytecodes::Code code = bytecode();
   const bool is_invokeinterface  = code == Bytecodes::_invokeinterface;
   const bool is_invokedynamic    = code == Bytecodes::_invokedynamic;
   const bool is_invokehandle     = code == Bytecodes::_invokehandle;
   const bool is_invokevirtual    = code == Bytecodes::_invokevirtual;
   const bool is_invokespecial    = code == Bytecodes::_invokespecial;
   const bool load_receiver       = (recv  != noreg);
   const bool save_flags          = (flags != noreg);
   assert(load_receiver == (code != Bytecodes::_invokestatic && code != Bytecodes::_invokedynamic), "");
   assert(save_flags    == (is_invokeinterface || is_invokevirtual), "need flags for vfinal");
   assert(flags == noreg || flags == rdx, "");
   assert(recv  == noreg || recv  == rcx, "");

   // setup registers & access constant pool cache
   if (recv  == noreg)  recv  = rcx;
   if (flags == noreg)  flags = rdx;
   assert_different_registers(method, index, recv, flags);

   // save 'interpreter return address'
   __ save_bcp();

   load_invoke_cp_cache_entry(byte_no, method, index, flags, is_invokevirtual, false, is_invokedynamic);

   // maybe push appendix to arguments (just before return address)
   if (is_invokedynamic || is_invokehandle) {
     Label L_no_push;
     __ testl(flags, (1 << ConstantPoolCacheEntry::has_appendix_shift));
     __ jcc(Assembler::zero, L_no_push);
     // Push the appendix as a trailing parameter.
     // This must be done before we get the receiver,
     // since the parameter_size includes it.
     __ push(rbx);
     __ mov(rbx, index);
     assert(ConstantPoolCacheEntry::_indy_resolved_references_appendix_offset == 0, "appendix expected at index+0");
     __ load_resolved_reference_at_index(index, rbx);
     __ pop(rbx);
     __ push(index);  // push appendix (MethodType, CallSite, etc.)
     __ bind(L_no_push);
   }

   // load receiver if needed (after appendix is pushed so parameter size is correct)
   // Note: no return address pushed yet
   if (load_receiver) {
     __ movl(recv, flags);
     __ andl(recv, ConstantPoolCacheEntry::parameter_size_mask);
     const int no_return_pc_pushed_yet = -1;  // argument slot correction before we push return address
     const int receiver_is_at_end      = -1;  // back off one slot to get receiver
     Address recv_addr = __ argument_address(recv, no_return_pc_pushed_yet + receiver_is_at_end);
     __ movptr(recv, recv_addr);
     __ verify_oop(recv);
   }

   if (save_flags) {
     __ movl(r13, flags);
   }

   // compute return type
   __ shrl(flags, ConstantPoolCacheEntry::tos_state_shift);
   // Make sure we don't need to mask flags after the above shift
   ConstantPoolCacheEntry::verify_tos_state_shift();
   // load return address
   {
     const address table_addr = (address) Interpreter::invoke_return_entry_table_for(code);
     ExternalAddress table(table_addr);
     __ lea(rscratch1, table);
     __ movptr(flags, Address(rscratch1, flags, Address::times_ptr));
   }

   // push return address
   __ push(flags);

   // Restore flags value from the constant pool cache, and restore rsi
   // for later null checks.  r13 is the bytecode pointer
   if (save_flags) {
     __ movl(flags, r13);
     __ restore_bcp();
   }
 }


 void TemplateTable::invokevirtual_helper(Register index,
                                          Register recv,
                                          Register flags) {
   // Uses temporary registers rax, rdx
   assert_different_registers(index, recv, rax, rdx);
   assert(index == rbx, "");
   assert(recv  == rcx, "");

   // Test for an invoke of a final method
   Label notFinal;
   __ movl(rax, flags);
   __ andl(rax, (1 << ConstantPoolCacheEntry::is_vfinal_shift));
   __ jcc(Assembler::zero, notFinal);

   const Register method = index;  // method must be rbx
   assert(method == rbx,
          "Method* must be rbx for interpreter calling convention");

   // do the call - the index is actually the method to call
   // that is, f2 is a vtable index if !is_vfinal, else f2 is a Method*

   // It's final, need a null check here!
   __ null_check(recv);

   // profile this call
   __ profile_final_call(rax);
   __ profile_arguments_type(rax, method, r13, true);

   __ jump_from_interpreted(method, rax);

   __ bind(notFinal);

   // get receiver klass
   __ null_check(recv, oopDesc::klass_offset_in_bytes());
   __ load_klass(rax, recv);

   // profile this call
   __ profile_virtual_call(rax, r14, rdx);

   // get target Method* & entry point
   __ lookup_virtual_method(rax, index, method);
   __ profile_arguments_type(rdx, method, r13, true);
   __ jump_from_interpreted(method, rdx);
 }


 void TemplateTable::invokevirtual(int byte_no) {
   transition(vtos, vtos);
   assert(byte_no == f2_byte, "use this argument");
   prepare_invoke(byte_no,
                  rbx,    // method or vtable index
                  noreg,  // unused itable index
                  rcx, rdx); // recv, flags

   // rbx: index
   // rcx: receiver
   // rdx: flags

   invokevirtual_helper(rbx, rcx, rdx);
 }


 void TemplateTable::invokespecial(int byte_no) {
   transition(vtos, vtos);
   assert(byte_no == f1_byte, "use this argument");
   prepare_invoke(byte_no, rbx, noreg,  // get f1 Method*
                  rcx);  // get receiver also for null check
   __ verify_oop(rcx);
   __ null_check(rcx);
   // do the call
   __ profile_call(rax);
   __ profile_arguments_type(rax, rbx, r13, false);
   __ jump_from_interpreted(rbx, rax);
 }


 void TemplateTable::invokestatic(int byte_no) {
   transition(vtos, vtos);
   assert(byte_no == f1_byte, "use this argument");
   prepare_invoke(byte_no, rbx);  // get f1 Method*
   // do the call
   __ profile_call(rax);
   __ profile_arguments_type(rax, rbx, r13, false);
   __ jump_from_interpreted(rbx, rax);
 }

 void TemplateTable::fast_invokevfinal(int byte_no) {
   transition(vtos, vtos);
   assert(byte_no == f2_byte, "use this argument");
   __ stop("fast_invokevfinal not used on amd64");
 }

 void TemplateTable::invokeinterface(int byte_no) {
   transition(vtos, vtos);
   assert(byte_no == f1_byte, "use this argument");
   prepare_invoke(byte_no, rax, rbx,  // get f1 Klass*, f2 itable index
                  rcx, rdx); // recv, flags

   // rax: interface klass (from f1)
   // rbx: itable index (from f2)
   // rcx: receiver
   // rdx: flags

   // Special case of invokeinterface called for virtual method of
   // java.lang.Object.  See cpCacheOop.cpp for details.
   // This code isn't produced by javac, but could be produced by
   // another compliant java compiler.
   Label notMethod;
   __ movl(r14, rdx);
   __ andl(r14, (1 << ConstantPoolCacheEntry::is_forced_virtual_shift));
   __ jcc(Assembler::zero, notMethod);

   invokevirtual_helper(rbx, rcx, rdx);
   __ bind(notMethod);

   // Get receiver klass into rdx - also a null check
   __ restore_locals();  // restore r14
   __ null_check(rcx, oopDesc::klass_offset_in_bytes());
   __ load_klass(rdx, rcx);

   // profile this call
   __ profile_virtual_call(rdx, r13, r14);

   Label no_such_interface, no_such_method;

   __ lookup_interface_method(// inputs: rec. class, interface, itable index
                              rdx, rax, rbx,
                              // outputs: method, scan temp. reg
                              rbx, r13,
                              no_such_interface);

   // rbx: Method* to call
   // rcx: receiver
   // Check for abstract method error
   // Note: This should be done more efficiently via a throw_abstract_method_error
   //       interpreter entry point and a conditional jump to it in case of a null
   //       method.
   __ testptr(rbx, rbx);
   __ jcc(Assembler::zero, no_such_method);

   __ profile_arguments_type(rdx, rbx, r13, true);

   // do the call
   // rcx: receiver
   // rbx,: Method*
   __ jump_from_interpreted(rbx, rdx);
   __ should_not_reach_here();

   // exception handling code follows...
   // note: must restore interpreter registers to canonical
   //       state for exception handling to work correctly!

   __ bind(no_such_method);
   // throw exception
   __ pop(rbx);           // pop return address (pushed by prepare_invoke)
   __ restore_bcp();      // r13 must be correct for exception handler   (was destroyed)
   __ restore_locals();   // make sure locals pointer is correct as well (was destroyed)
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError));
   // the call_VM checks for exception, so we should never return here.
   __ should_not_reach_here();

   __ bind(no_such_interface);
   // throw exception
   __ pop(rbx);           // pop return address (pushed by prepare_invoke)
   __ restore_bcp();      // r13 must be correct for exception handler   (was destroyed)
   __ restore_locals();   // make sure locals pointer is correct as well (was destroyed)
   __ call_VM(noreg, CAST_FROM_FN_PTR(address,
                    InterpreterRuntime::throw_IncompatibleClassChangeError));
   // the call_VM checks for exception, so we should never return here.
   __ should_not_reach_here();
 }


 void TemplateTable::invokehandle(int byte_no) {
   transition(vtos, vtos);
   assert(byte_no == f1_byte, "use this argument");
   const Register rbx_method = rbx;
   const Register rax_mtype  = rax;
   const Register rcx_recv   = rcx;
   const Register rdx_flags  = rdx;

   if (!EnableInvokeDynamic) {
     // rewriter does not generate this bytecode
     __ should_not_reach_here();
     return;
   }

   prepare_invoke(byte_no, rbx_method, rax_mtype, rcx_recv);
   __ verify_method_ptr(rbx_method);
   __ verify_oop(rcx_recv);
   __ null_check(rcx_recv);

   // rax: MethodType object (from cpool->resolved_references[f1], if necessary)
   // rbx: MH.invokeExact_MT method (from f2)

   // Note:  rax_mtype is already pushed (if necessary) by prepare_invoke

   // FIXME: profile the LambdaForm also
   __ profile_final_call(rax);
   __ profile_arguments_type(rdx, rbx_method, r13, true);

   __ jump_from_interpreted(rbx_method, rdx);
 }


 void TemplateTable::invokedynamic(int byte_no) {
   transition(vtos, vtos);
   assert(byte_no == f1_byte, "use this argument");

   if (!EnableInvokeDynamic) {
     // We should not encounter this bytecode if !EnableInvokeDynamic.
     // The verifier will stop it.  However, if we get past the verifier,
     // this will stop the thread in a reasonable way, without crashing the JVM.
     __ call_VM(noreg, CAST_FROM_FN_PTR(address,
                      InterpreterRuntime::throw_IncompatibleClassChangeError));
     // the call_VM checks for exception, so we should never return here.
     __ should_not_reach_here();
     return;
   }

   const Register rbx_method   = rbx;
   const Register rax_callsite = rax;

   prepare_invoke(byte_no, rbx_method, rax_callsite);

   // rax: CallSite object (from cpool->resolved_references[f1])
   // rbx: MH.linkToCallSite method (from f2)

   // Note:  rax_callsite is already pushed by prepare_invoke

   // %%% should make a type profile for any invokedynamic that takes a ref argument
   // profile this call
   __ profile_call(r13);
   __ profile_arguments_type(rdx, rbx_method, r13, false);

   __ verify_oop(rax_callsite);

   __ jump_from_interpreted(rbx_method, rdx);
 }


 //-----------------------------------------------------------------------------
 // Allocation

 void TemplateTable::_new() {
   transition(vtos, atos);
   __ get_unsigned_2_byte_index_at_bcp(rdx, 1);
   Label slow_case;
   Label done;
   Label initialize_header;
   Label initialize_object; // including clearing the fields
   Label allocate_shared;

   __ get_cpool_and_tags(rsi, rax);
   // Make sure the class we're about to instantiate has been resolved.
   // This is done before loading InstanceKlass to be consistent with the order
   // how Constant Pool is updated (see ConstantPool::klass_at_put)
   const int tags_offset = Array<u1>::base_offset_in_bytes();
   __ cmpb(Address(rax, rdx, Address::times_1, tags_offset),
           JVM_CONSTANT_Class);
   __ jcc(Assembler::notEqual, slow_case);

   // get InstanceKlass
   __ movptr(rsi, Address(rsi, rdx,
             Address::times_8, sizeof(ConstantPool)));

   // make sure klass is initialized & doesn't have finalizer
   // make sure klass is fully initialized
   __ cmpb(Address(rsi,
                   InstanceKlass::init_state_offset()),
           InstanceKlass::fully_initialized);
   __ jcc(Assembler::notEqual, slow_case);

   // get instance_size in InstanceKlass (scaled to a count of bytes)
   __ movl(rdx,
           Address(rsi,
                   Klass::layout_helper_offset()));
   // test to see if it has a finalizer or is malformed in some way
   __ testl(rdx, Klass::_lh_instance_slow_path_bit);
   __ jcc(Assembler::notZero, slow_case);

   // Allocate the instance
   // 1) Try to allocate in the TLAB
   // 2) if fail and the object is large allocate in the shared Eden
   // 3) if the above fails (or is not applicable), go to a slow case
   // (creates a new TLAB, etc.)

   const bool allow_shared_alloc =
     Universe::heap()->supports_inline_contig_alloc() && !CMSIncrementalMode;

   if (UseTLAB) {
     __ movptr(rax, Address(r15_thread, in_bytes(JavaThread::tlab_top_offset())));
     __ lea(rbx, Address(rax, rdx, Address::times_1));
     __ cmpptr(rbx, Address(r15_thread, in_bytes(JavaThread::tlab_end_offset())));
     __ jcc(Assembler::above, allow_shared_alloc ? allocate_shared : slow_case);
     __ movptr(Address(r15_thread, in_bytes(JavaThread::tlab_top_offset())), rbx);
     if (ZeroTLAB) {
       // the fields have been already cleared
       __ jmp(initialize_header);
     } else {
       // initialize both the header and fields
       __ jmp(initialize_object);
     }
   }

   // Allocation in the shared Eden, if allowed.
   //
   // rdx: instance size in bytes
   if (allow_shared_alloc) {
     __ bind(allocate_shared);

     ExternalAddress top((address)Universe::heap()->top_addr());
     ExternalAddress end((address)Universe::heap()->end_addr());

     const Register RtopAddr = rscratch1;
     const Register RendAddr = rscratch2;

     __ lea(RtopAddr, top);
     __ lea(RendAddr, end);
     __ movptr(rax, Address(RtopAddr, 0));

     // For retries rax gets set by cmpxchgq
     Label retry;
     __ bind(retry);
     __ lea(rbx, Address(rax, rdx, Address::times_1));
     __ cmpptr(rbx, Address(RendAddr, 0));
     __ jcc(Assembler::above, slow_case);

     // Compare rax with the top addr, and if still equal, store the new
     // top addr in rbx at the address of the top addr pointer. Sets ZF if was
     // equal, and clears it otherwise. Use lock prefix for atomicity on MPs.
     //
     // rax: object begin
     // rbx: object end
     // rdx: instance size in bytes
     if (os::is_MP()) {
       __ lock();
     }
     __ cmpxchgptr(rbx, Address(RtopAddr, 0));

     // if someone beat us on the allocation, try again, otherwise continue
     __ jcc(Assembler::notEqual, retry);

     __ incr_allocated_bytes(r15_thread, rdx, 0);
   }

   if (UseTLAB || Universe::heap()->supports_inline_contig_alloc()) {
     // The object is initialized before the header.  If the object size is
     // zero, go directly to the header initialization.
     __ bind(initialize_object);
     __ decrementl(rdx, sizeof(oopDesc));
     __ jcc(Assembler::zero, initialize_header);

     // Initialize object fields
     __ xorl(rcx, rcx); // use zero reg to clear memory (shorter code)
     __ shrl(rdx, LogBytesPerLong);  // divide by oopSize to simplify the loop
     {
       Label loop;
       __ bind(loop);
       __ movq(Address(rax, rdx, Address::times_8,
                       sizeof(oopDesc) - oopSize),
               rcx);
       __ decrementl(rdx);
       __ jcc(Assembler::notZero, loop);
     }

     // initialize object header only.
     __ bind(initialize_header);
     if (UseBiasedLocking) {
       __ movptr(rscratch1, Address(rsi, Klass::prototype_header_offset()));
       __ movptr(Address(rax, oopDesc::mark_offset_in_bytes()), rscratch1);
     } else {
       __ movptr(Address(rax, oopDesc::mark_offset_in_bytes()),
                (intptr_t) markOopDesc::prototype()); // header (address 0x1)
     }
     __ xorl(rcx, rcx); // use zero reg to clear memory (shorter code)
     __ store_klass_gap(rax, rcx);  // zero klass gap for compressed oops
     __ store_klass(rax, rsi);      // store klass last

     {
       SkipIfEqual skip(_masm, &DTraceAllocProbes, false);
       // Trigger dtrace event for fastpath
       __ push(atos); // save the return value
       __ call_VM_leaf(
            CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc), rax);
       __ pop(atos); // restore the return value

     }
     __ jmp(done);
   }


   // slow case
   __ bind(slow_case);
   __ get_constant_pool(c_rarg1);
   __ get_unsigned_2_byte_index_at_bcp(c_rarg2, 1);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::_new), c_rarg1, c_rarg2);
   __ verify_oop(rax);

   // continue
   __ bind(done);
 }

 void TemplateTable::newarray() {
   transition(itos, atos);
   __ load_unsigned_byte(c_rarg1, at_bcp(1));
   __ movl(c_rarg2, rax);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::newarray),
           c_rarg1, c_rarg2);
 }

 void TemplateTable::anewarray() {
   transition(itos, atos);
   __ get_unsigned_2_byte_index_at_bcp(c_rarg2, 1);
   __ get_constant_pool(c_rarg1);
   __ movl(c_rarg3, rax);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::anewarray),
           c_rarg1, c_rarg2, c_rarg3);
 }

 void TemplateTable::arraylength() {
   transition(atos, itos);
   __ null_check(rax, arrayOopDesc::length_offset_in_bytes());
   __ movl(rax, Address(rax, arrayOopDesc::length_offset_in_bytes()));
 }

 void TemplateTable::checkcast() {
   transition(atos, atos);
   Label done, is_null, ok_is_subtype, quicked, resolved;
   __ testptr(rax, rax); // object is in rax
   __ jcc(Assembler::zero, is_null);

   // Get cpool & tags index
   __ get_cpool_and_tags(rcx, rdx); // rcx=cpool, rdx=tags array
   __ get_unsigned_2_byte_index_at_bcp(rbx, 1); // rbx=index
   // See if bytecode has already been quicked
   __ cmpb(Address(rdx, rbx,
                   Address::times_1,
                   Array<u1>::base_offset_in_bytes()),
           JVM_CONSTANT_Class);
   __ jcc(Assembler::equal, quicked);
   __ push(atos); // save receiver for result, and for GC
   call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::quicken_io_cc));
   // vm_result_2 has metadata result
   __ get_vm_result_2(rax, r15_thread);
   __ pop_ptr(rdx); // restore receiver
   __ jmpb(resolved);

   // Get superklass in rax and subklass in rbx
   __ bind(quicked);
   __ mov(rdx, rax); // Save object in rdx; rax needed for subtype check
   __ movptr(rax, Address(rcx, rbx,
                        Address::times_8, sizeof(ConstantPool)));

   __ bind(resolved);
   __ load_klass(rbx, rdx);

   // Generate subtype check.  Blows rcx, rdi.  Object in rdx.
   // Superklass in rax.  Subklass in rbx.
   __ gen_subtype_check(rbx, ok_is_subtype);

   // Come here on failure
   __ push_ptr(rdx);
   // object is at TOS
   __ jump(ExternalAddress(Interpreter::_throw_ClassCastException_entry));

   // Come here on success
   __ bind(ok_is_subtype);
   __ mov(rax, rdx); // Restore object in rdx

   // Collect counts on whether this check-cast sees NULLs a lot or not.
   if (ProfileInterpreter) {
     __ jmp(done);
     __ bind(is_null);
     __ profile_null_seen(rcx);
   } else {
     __ bind(is_null);   // same as 'done'
   }
   __ bind(done);
 }

 void TemplateTable::instanceof() {
   transition(atos, itos);
   Label done, is_null, ok_is_subtype, quicked, resolved;
   __ testptr(rax, rax);
   __ jcc(Assembler::zero, is_null);

   // Get cpool & tags index
   __ get_cpool_and_tags(rcx, rdx); // rcx=cpool, rdx=tags array
   __ get_unsigned_2_byte_index_at_bcp(rbx, 1); // rbx=index
   // See if bytecode has already been quicked
   __ cmpb(Address(rdx, rbx,
                   Address::times_1,
                   Array<u1>::base_offset_in_bytes()),
           JVM_CONSTANT_Class);
   __ jcc(Assembler::equal, quicked);

   __ push(atos); // save receiver for result, and for GC
   call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::quicken_io_cc));
   // vm_result_2 has metadata result
   __ get_vm_result_2(rax, r15_thread);
   __ pop_ptr(rdx); // restore receiver
   __ verify_oop(rdx);
   __ load_klass(rdx, rdx);
   __ jmpb(resolved);

   // Get superklass in rax and subklass in rdx
   __ bind(quicked);
   __ load_klass(rdx, rax);
   __ movptr(rax, Address(rcx, rbx,
                          Address::times_8, sizeof(ConstantPool)));

   __ bind(resolved);

   // Generate subtype check.  Blows rcx, rdi
   // Superklass in rax.  Subklass in rdx.
   __ gen_subtype_check(rdx, ok_is_subtype);

   // Come here on failure
   __ xorl(rax, rax);
   __ jmpb(done);
   // Come here on success
   __ bind(ok_is_subtype);
   __ movl(rax, 1);

   // Collect counts on whether this test sees NULLs a lot or not.
   if (ProfileInterpreter) {
     __ jmp(done);
     __ bind(is_null);
     __ profile_null_seen(rcx);
   } else {
     __ bind(is_null);   // same as 'done'
   }
   __ bind(done);
   // rax = 0: obj == NULL or  obj is not an instanceof the specified klass
   // rax = 1: obj != NULL and obj is     an instanceof the specified klass
 }

 //-----------------------------------------------------------------------------
 // Breakpoints
 void TemplateTable::_breakpoint() {
   // Note: We get here even if we are single stepping..
   // jbug inists on setting breakpoints at every bytecode
   // even if we are in single step mode.

   transition(vtos, vtos);

   // get the unpatched byte code
   __ get_method(c_rarg1);
   __ call_VM(noreg,
              CAST_FROM_FN_PTR(address,
                               InterpreterRuntime::get_original_bytecode_at),
              c_rarg1, r13);
   __ mov(rbx, rax);

   // post the breakpoint event
   __ get_method(c_rarg1);
   __ call_VM(noreg,
              CAST_FROM_FN_PTR(address, InterpreterRuntime::_breakpoint),
              c_rarg1, r13);

   // complete the execution of original bytecode
   __ dispatch_only_normal(vtos);
 }

 //-----------------------------------------------------------------------------
 // Exceptions

 void TemplateTable::athrow() {
   transition(atos, vtos);
   __ null_check(rax);
   __ jump(ExternalAddress(Interpreter::throw_exception_entry()));
 }

 //-----------------------------------------------------------------------------
 // Synchronization
 //
 // Note: monitorenter & exit are symmetric routines; which is reflected
 //       in the assembly code structure as well
 //
 // Stack layout:
 //
 // [expressions  ] <--- rsp               = expression stack top
 // ..
 // [expressions  ]
 // [monitor entry] <--- monitor block top = expression stack bot
 // ..
 // [monitor entry]
 // [frame data   ] <--- monitor block bot
 // ...
 // [saved rbp    ] <--- rbp
 void TemplateTable::monitorenter() {
   transition(atos, vtos);

   // check for NULL object
   __ null_check(rax);

   const Address monitor_block_top(
         rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
   const Address monitor_block_bot(
         rbp, frame::interpreter_frame_initial_sp_offset * wordSize);
   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;

   Label allocated;

   // initialize entry pointer
   __ xorl(c_rarg1, c_rarg1); // points to free slot or NULL

   // find a free slot in the monitor block (result in c_rarg1)
   {
     Label entry, loop, exit;
     __ movptr(c_rarg3, monitor_block_top); // points to current entry,
                                      // starting with top-most entry
     __ lea(c_rarg2, monitor_block_bot); // points to word before bottom
                                      // of monitor block
     __ jmpb(entry);

     __ bind(loop);
     // check if current entry is used
     __ cmpptr(Address(c_rarg3, BasicObjectLock::obj_offset_in_bytes()), (int32_t) NULL_WORD);
     // if not used then remember entry in c_rarg1
     __ cmov(Assembler::equal, c_rarg1, c_rarg3);
     // check if current entry is for same object
     __ cmpptr(rax, Address(c_rarg3, BasicObjectLock::obj_offset_in_bytes()));
     // if same object then stop searching
     __ jccb(Assembler::equal, exit);
     // otherwise advance to next entry
     __ addptr(c_rarg3, entry_size);
     __ bind(entry);
     // check if bottom reached
     __ cmpptr(c_rarg3, c_rarg2);
     // if not at bottom then check this entry
     __ jcc(Assembler::notEqual, loop);
     __ bind(exit);
   }

   __ testptr(c_rarg1, c_rarg1); // check if a slot has been found
   __ jcc(Assembler::notZero, allocated); // if found, continue with that one

   // allocate one if there's no free slot
   {
     Label entry, loop;
     // 1. compute new pointers             // rsp: old expression stack top
     __ movptr(c_rarg1, monitor_block_bot); // c_rarg1: old expression stack bottom
     __ subptr(rsp, entry_size);            // move expression stack top
     __ subptr(c_rarg1, entry_size);        // move expression stack bottom
     __ mov(c_rarg3, rsp);                  // set start value for copy loop
     __ movptr(monitor_block_bot, c_rarg1); // set new monitor block bottom
     __ jmp(entry);
     // 2. move expression stack contents
     __ bind(loop);
     __ movptr(c_rarg2, Address(c_rarg3, entry_size)); // load expression stack
                                                       // word from old location
     __ movptr(Address(c_rarg3, 0), c_rarg2);          // and store it at new location
     __ addptr(c_rarg3, wordSize);                     // advance to next word
     __ bind(entry);
     __ cmpptr(c_rarg3, c_rarg1);            // check if bottom reached
     __ jcc(Assembler::notEqual, loop);      // if not at bottom then
                                             // copy next word
   }

   // call run-time routine
   // c_rarg1: points to monitor entry
   __ bind(allocated);

   // Increment bcp to point to the next bytecode, so exception
   // handling for async. exceptions work correctly.
   // The object has already been poped from the stack, so the
   // expression stack looks correct.
   __ increment(r13);

   // store object
   __ movptr(Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()), rax);
   __ lock_object(c_rarg1);

   // check to make sure this monitor doesn't cause stack overflow after locking
   __ save_bcp();  // in case of exception
   __ generate_stack_overflow_check(0);

   // The bcp has already been incremented. Just need to dispatch to
   // next instruction.
   __ dispatch_next(vtos);
 }


 void TemplateTable::monitorexit() {
   transition(atos, vtos);

   // check for NULL object
   __ null_check(rax);

   const Address monitor_block_top(
         rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
   const Address monitor_block_bot(
         rbp, frame::interpreter_frame_initial_sp_offset * wordSize);
   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;

   Label found;

   // find matching slot
   {
     Label entry, loop;
     __ movptr(c_rarg1, monitor_block_top); // points to current entry,
                                      // starting with top-most entry
     __ lea(c_rarg2, monitor_block_bot); // points to word before bottom
                                      // of monitor block
     __ jmpb(entry);

     __ bind(loop);
     // check if current entry is for same object
     __ cmpptr(rax, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()));
     // if same object then stop searching
     __ jcc(Assembler::equal, found);
     // otherwise advance to next entry
     __ addptr(c_rarg1, entry_size);
     __ bind(entry);
     // check if bottom reached
     __ cmpptr(c_rarg1, c_rarg2);
     // if not at bottom then check this entry
     __ jcc(Assembler::notEqual, loop);
   }

   // error handling. Unlocking was not block-structured
   __ call_VM(noreg, CAST_FROM_FN_PTR(address,
                    InterpreterRuntime::throw_illegal_monitor_state_exception));
   __ should_not_reach_here();

   // call run-time routine
   // rsi: points to monitor entry
   __ bind(found);
   __ push_ptr(rax); // make sure object is on stack (contract with oopMaps)
   __ unlock_object(c_rarg1);
   __ pop_ptr(rax); // discard object
 }


 // Wide instructions
 void TemplateTable::wide() {
   transition(vtos, vtos);
   __ load_unsigned_byte(rbx, at_bcp(1));
   __ lea(rscratch1, ExternalAddress((address)Interpreter::_wentry_point));
   __ jmp(Address(rscratch1, rbx, Address::times_8));
   // Note: the r13 increment step is part of the individual wide
   // bytecode implementations
 }


 // Multi arrays
 void TemplateTable::multianewarray() {
   transition(vtos, atos);
   __ load_unsigned_byte(rax, at_bcp(3)); // get number of dimensions
   // last dim is on top of stack; we want address of first one:
   // first_addr = last_addr + (ndims - 1) * wordSize
   __ lea(c_rarg1, Address(rsp, rax, Address::times_8, -wordSize));
   call_VM(rax,
           CAST_FROM_FN_PTR(address, InterpreterRuntime::multianewarray),
           c_rarg1);
   __ load_unsigned_byte(rbx, at_bcp(3));
   __ lea(rsp, Address(rsp, rbx, Address::times_8));
 }
 #endif // !CC_INTERP