Fix assembling of paddd, psubd instructions on x64.

runtime/vm/assembler_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"  // NOLINT
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/heap.h"
@@ skipping 704 matching lines @@
   EmitUint8(0xF2);
   EmitREX_RB(dst, src);
   EmitUint8(0x0F);
   EmitUint8(0x5E);
   EmitXmmRegisterOperand(dst & 7, src);
 }
 
 
 void Assembler::addpl(XmmRegister dst, XmmRegister src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
   EmitREX_RB(dst, src);
-  EmitUint8(0x66);
   EmitUint8(0x0F);
   EmitUint8(0xFE);
-  EmitXmmRegisterOperand(dst, src);
+  EmitXmmRegisterOperand(dst& 7, src);
 }
 
 
 void Assembler::subpl(XmmRegister dst, XmmRegister src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
+  EmitUint8(0x66);
   EmitREX_RB(dst, src);
-  EmitUint8(0x66);
   EmitUint8(0x0F);
   EmitUint8(0xFA);
-  EmitXmmRegisterOperand(dst, src);
+  EmitXmmRegisterOperand(dst & 7, src);
 }
 
 
 void Assembler::addps(XmmRegister dst, XmmRegister src) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitREX_RB(dst, src);
   EmitUint8(0x0F);
   EmitUint8(0x58);
   EmitXmmRegisterOperand(dst & 7, src);
 }
@@ skipping 3145 matching lines @@
 
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
   return xmm_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64