X64: Make smi memory operations work directly on the embedded value.

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index b55a7b72631046bdf442cbcf36374b34acea2f80..bfe4d8e45496f766e4d8064ecd6d2e544201770f 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -300,12 +300,16 @@ class Operand BASE_EMBEDDED {
           ScaleFactor scale,
           int32_t disp);
 
+  // Offset from existing memory operand.
+  // Offset is added to existing displacement as 32-bit signed values - so
+  // don't overflow.

[William Hesse, 2010/05/26 08:13:24]

Add assert for no overflow in .cc file - see comment there.

[Lasse Reichstein, 2010/05/26 08:34:11]

Done.

+  Operand(const Operand& base, int32_t offset);
+
  private:
   byte rex_;
   byte buf_[10];
   // The number of bytes in buf_.
   unsigned int len_;
-  RelocInfo::Mode rmode_;
 
   // Set the ModR/M byte without an encoded 'reg' register. The
   // register is encoded later as part of the emit_operand operation.