Optimize the assembly code generated for Math.random()

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
===================================================================
--- src/x64/assembler-x64.cc	(revision 4383)
+++ src/x64/assembler-x64.cc	(working copy)
@@ -2385,6 +2385,17 @@
 
 // SSE 2 operations.
 
+void Assembler::movd(XMMRegister dst, Register src) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit(0x66);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0x6E);
+  emit_sse_operand(dst, src);
+}
+
+
 void Assembler::movsd(const Operand& dst, XMMRegister src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;
@@ -2473,6 +2484,17 @@
 }
 
 
+void Assembler::cvtss2sd(XMMRegister dst, XMMRegister src) {
+  EnsureSpace ensure_space(this);
+  last_pc_ = pc_;
+  emit(0xF3);
+  emit_optional_rex_32(dst, src);
+  emit(0x0F);
+  emit(0x5A);
+  emit_sse_operand(dst, src);
+}
+
+
 void Assembler::addsd(XMMRegister dst, XMMRegister src) {
   EnsureSpace ensure_space(this);
   last_pc_ = pc_;