Support inlining and crankshaft optimization of Math.random.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index d0a5a41da6b91031602ece3f16ea1fad72027889..3fe5b7cd2f12d340d9852ac2174d6ad7d76d498f 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -1415,6 +1415,21 @@ LInstruction* LChunkBuilder::DoPower(HPower* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoRandom(HRandom* instr) {
+  ASSERT(instr->representation().IsDouble());
+  ASSERT(instr->global_object()->representation().IsTagged());
+#ifdef _WIN64
+  LOperand* global_object = UseFixed(instr->global_object(), rcx);
+#else
+  LOperand* global_object = UseFixed(instr->global_object(), rdi);
+#endif
+  LRandom* result = new LRandom(global_object);
+  return MarkAsCall(DefineFixedDouble(result, xmm1),
+                    instr,
+                    CAN_DEOPTIMIZE_EAGERLY);
+}
+
+
 LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
   ASSERT(instr->left()->representation().IsTagged());
   ASSERT(instr->right()->representation().IsTagged());