Rollback of r17108, r17106, r17104 in trunk branch.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index d73fdfba8a802d0c5885eb282711d2e0a28b6c15..b027b39d2774d2e73cf765539e802d1947fc98e9 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -2276,8 +2276,6 @@ void LCodeGen::DoArithmeticD(LArithmeticD* instr) {
         __ PrepareCallCFunction(4, eax);
         X87Mov(Operand(esp, 1 * kDoubleSize), right);
         X87Mov(Operand(esp, 0), left);
-        X87Free(right);
-        ASSERT(left.is(result));
         X87PrepareToWrite(result);
         __ CallCFunction(
             ExternalReference::double_fp_operation(Token::MOD, isolate()),
@@ -5018,21 +5016,14 @@ void LCodeGen::DoInteger32ToSmi(LInteger32ToSmi* instr) {
 
 
 void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
+  CpuFeatureScope scope(masm(), SSE2);
   LOperand* input = instr->value();
   LOperand* output = instr->result();
-  if (CpuFeatures::IsSupported(SSE2)) {
-    CpuFeatureScope scope(masm(), SSE2);
-    LOperand* temp = instr->temp();
+  LOperand* temp = instr->temp();
 
-    __ LoadUint32(ToDoubleRegister(output),
-                  ToRegister(input),
-                  ToDoubleRegister(temp));
-  } else {
-    X87Register res = ToX87Register(output);
-    X87PrepareToWrite(res);
-    __ LoadUint32NoSSE2(ToRegister(input));
-    X87CommitWrite(res);
-  }
+  __ LoadUint32(ToDoubleRegister(output),
+                ToRegister(input),
+                ToDoubleRegister(temp));
 }