Use UnboxedInt32 and UnboxedUint32 representation for LoadIndexedInstr

runtime/vm/assembler_x64.h

 // 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.
 
 #ifndef VM_ASSEMBLER_X64_H_
 #define VM_ASSEMBLER_X64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_x64.h directly; use assembler.h instead.
 #endif
@@ skipping 460 matching lines @@
   void abspd(XmmRegister dst);
   void minpd(XmmRegister dst, XmmRegister src);
   void maxpd(XmmRegister dst, XmmRegister src);
   void sqrtpd(XmmRegister dst);
   void cvtps2pd(XmmRegister dst, XmmRegister src);
   void cvtpd2ps(XmmRegister dst, XmmRegister src);
   void shufpd(XmmRegister dst, XmmRegister src, const Immediate& mask);
 
   void comisd(XmmRegister a, XmmRegister b);
   void cvtsi2sd(XmmRegister a, Register b);
+  // Only looks at first 32-bits of b.
+  void cvtsi2sd32(XmmRegister a, Register b);

[Vyacheslav Egorov (Google), 2014/10/09 19:08:58]

I'd think that ideally this instructions would use the same suffix schema as
other instructions.

s/cvtsi2sd/cvtsi2sdq/
s/cvtsi2sd32/cvtsi2sdl/

but maybe that would be too much changes around. 

[Cutch, 2014/10/09 20:48:22]

I had the same thought after Zach's suggestion. Done.

   void cvttsd2siq(Register dst, XmmRegister src);
 
   void cvtss2sd(XmmRegister dst, XmmRegister src);
   void cvtsd2ss(XmmRegister dst, XmmRegister src);
 
   void pxor(XmmRegister dst, XmmRegister src);
 
   enum RoundingMode {
     kRoundToNearest = 0x0,
     kRoundDown      = 0x1,
@@ skipping 655 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_