Optimize the assembly code generated for Math.random()

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1061 matching lines @@
   void fnclex();
 
   void fsin();
   void fcos();
 
   void frndint();
 
   void sahf();
 
   // SSE2 instructions
+  void movd(XMMRegister dst, Register src);
+
   void movsd(const Operand& dst, XMMRegister src);
-  void movsd(XMMRegister src, XMMRegister dst);
-  void movsd(XMMRegister src, const Operand& dst);
+  void movsd(XMMRegister dst, XMMRegister src);
+  void movsd(XMMRegister dst, const Operand& src);
 
   void cvttss2si(Register dst, const Operand& src);
   void cvttsd2si(Register dst, const Operand& src);
 
   void cvtlsi2sd(XMMRegister dst, const Operand& src);
   void cvtlsi2sd(XMMRegister dst, Register src);
   void cvtqsi2sd(XMMRegister dst, const Operand& src);
   void cvtqsi2sd(XMMRegister dst, Register src);
 
+  void cvtss2sd(XMMRegister dst, XMMRegister src);
+
   void addsd(XMMRegister dst, XMMRegister src);
   void subsd(XMMRegister dst, XMMRegister src);
   void mulsd(XMMRegister dst, XMMRegister src);
   void divsd(XMMRegister dst, XMMRegister src);
 
   void xorpd(XMMRegister dst, XMMRegister src);
 
   void comisd(XMMRegister dst, XMMRegister src);
   void ucomisd(XMMRegister dst, XMMRegister src);
 
+  // The first argument is the reg field, the second argument is the r/m field.
   void emit_sse_operand(XMMRegister dst, XMMRegister src);
   void emit_sse_operand(XMMRegister reg, const Operand& adr);
   void emit_sse_operand(XMMRegister dst, Register src);
 
   // Use either movsd or movlpd.
   // void movdbl(XMMRegister dst, const Operand& src);
   // void movdbl(const Operand& dst, XMMRegister src);
 
   // Debugging
   void Print();
@@ skipping 262 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_