X64: Use low bits of registers in emit_sse_operand. Enable --stop-at flag.

src/x64/assembler-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2004 matching lines @@
 
 
 
 void Assembler::emit_sse_operand(XMMRegister reg, const Operand& adr) {
   Register ireg = { reg.code() };
   emit_operand(ireg, adr);
 }
 
 
 void Assembler::emit_sse_operand(XMMRegister dst, XMMRegister src) {
-  emit(0xC0 | (dst.code() << 3) | src.code());
+  emit(0xC0 | (dst.low_bits() << 3) | src.low_bits());
 }
 
 void Assembler::emit_sse_operand(XMMRegister dst, Register src) {
-  emit(0xC0 | (dst.code() << 3) | src.code());
+  emit(0xC0 | (dst.low_bits() << 3) | src.low_bits());
 }
 
 
 // Relocation information implementations
 
 void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
   ASSERT(rmode != RelocInfo::NONE);
   // Don't record external references unless the heap will be serialized.
   if (rmode == RelocInfo::EXTERNAL_REFERENCE &&
       !Serializer::enabled() &&
@@ skipping 95 matching lines @@
 bool BreakLocationIterator::IsDebugBreakAtReturn()  {
   UNIMPLEMENTED();
   return false;
 }
 
 void BreakLocationIterator::SetDebugBreakAtReturn()  {
   UNIMPLEMENTED();
 }
 
 } }  // namespace v8::internal