[ia32] Fix MacroAssembler::Move for int64 to float64 moves.

src/ia32/macro-assembler-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 2359 matching lines @@
       push(eax);
       mov(eax, Immediate(src));
       movd(dst, Operand(eax));
       pop(eax);
     }
   }
 }
 
 
 void MacroAssembler::Move(XMMRegister dst, uint64_t src) {
-  uint32_t lower = static_cast<uint32_t>(src);
-  uint32_t upper = static_cast<uint32_t>(src >> 32);
-  if (upper == 0) {
-    Move(dst, lower);
+  if (src == 0) {
+    pxor(dst, dst);
   } else {
+    uint32_t lower = static_cast<uint32_t>(src);
+    uint32_t upper = static_cast<uint32_t>(src >> 32);
     unsigned cnt = base::bits::CountPopulation64(src);
     unsigned nlz = base::bits::CountLeadingZeros64(src);
     unsigned ntz = base::bits::CountTrailingZeros64(src);
     if (nlz + cnt + ntz == 64) {
       pcmpeqd(dst, dst);
       if (ntz == 0) {
         psrlq(dst, 64 - cnt);
       } else {
         psllq(dst, 64 - cnt);
         if (nlz != 0) psrlq(dst, nlz);
@@ skipping 824 matching lines @@
   if (mag.shift > 0) sar(edx, mag.shift);
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32