Merge r7366 to 3.1 branch.

src/ia32/full-codegen-ia32.cc

 // Copyright 2011 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2754 matching lines @@
   context()->Plug(eax);
 }
 
 
 void FullCodeGenerator::EmitMathPow(ZoneList<Expression*>* args) {
   // Load the arguments on the stack and call the runtime function.
   ASSERT(args->length() == 2);
   VisitForStackValue(args->at(0));
   VisitForStackValue(args->at(1));
 
-  MathPowStub stub;
-  __ CallStub(&stub);
+  if (masm()->isolate()->cpu_features()->IsSupported(SSE2)) {
+    MathPowStub stub;
+    __ CallStub(&stub);
+  } else {
+    __ CallRuntime(Runtime::kMath_pow, 2);
+  }
   context()->Plug(eax);
 }
 
 
 void FullCodeGenerator::EmitSetValueOf(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 2);
 
   VisitForStackValue(args->at(0));  // Load the object.
   VisitForAccumulatorValue(args->at(1));  // Load the value.
   __ pop(ebx);  // eax = value. ebx = object.
@@ skipping 1482 matching lines @@
   // And return.
   __ ret(0);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32