Relax requirement from VFP3 to VFP2 where possible.

src/arm/code-stubs-arm.h

Index: src/arm/code-stubs-arm.h
diff --git a/src/arm/code-stubs-arm.h b/src/arm/code-stubs-arm.h
index 38ed476cc1e831b65354a9b64cee739355eb7693..3ddc405715e0073579f9047d2d50813379434b10 100644
--- a/src/arm/code-stubs-arm.h
+++ b/src/arm/code-stubs-arm.h
@@ -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:
@@ -149,7 +149,7 @@ class BinaryOpStub: public CodeStub {
         mode_(mode),
         operands_type_(BinaryOpIC::UNINITIALIZED),
         result_type_(BinaryOpIC::UNINITIALIZED) {
-    use_vfp3_ = CpuFeatures::IsSupported(VFP3);
+    use_vfp2_ = CpuFeatures::IsSupported(VFP2);
     ASSERT(OpBits::is_valid(Token::NUM_TOKENS));
   }
 
@@ -159,7 +159,7 @@ class BinaryOpStub: public CodeStub {
       BinaryOpIC::TypeInfo result_type = BinaryOpIC::UNINITIALIZED)
       : op_(OpBits::decode(key)),
         mode_(ModeBits::decode(key)),
-        use_vfp3_(VFP3Bits::decode(key)),
+        use_vfp2_(VFP2Bits::decode(key)),
         operands_type_(operands_type),
         result_type_(result_type) { }
 
@@ -171,7 +171,7 @@ class BinaryOpStub: public CodeStub {
 
   Token::Value op_;
   OverwriteMode mode_;
-  bool use_vfp3_;
+  bool use_vfp2_;
 
   // Operand type information determined at runtime.
   BinaryOpIC::TypeInfo operands_type_;
@@ -182,7 +182,7 @@ class BinaryOpStub: public CodeStub {
   // Minor key encoding in 16 bits RRRTTTVOOOOOOOMM.
   class ModeBits: public BitField<OverwriteMode, 0, 2> {};
   class OpBits: public BitField<Token::Value, 2, 7> {};
-  class VFP3Bits: public BitField<bool, 9, 1> {};
+  class VFP2Bits: public BitField<bool, 9, 1> {};
   class OperandTypeInfoBits: public BitField<BinaryOpIC::TypeInfo, 10, 3> {};
   class ResultTypeInfoBits: public BitField<BinaryOpIC::TypeInfo, 13, 3> {};
 
@@ -190,7 +190,7 @@ class BinaryOpStub: public CodeStub {
   int MinorKey() {
     return OpBits::encode(op_)
            | ModeBits::encode(mode_)
-           | VFP3Bits::encode(use_vfp3_)
+           | VFP2Bits::encode(use_vfp2_)
            | OperandTypeInfoBits::encode(operands_type_)
            | ResultTypeInfoBits::encode(result_type_);
   }
@@ -571,7 +571,7 @@ class RecordWriteStub: public CodeStub {
     void SaveCallerSaveRegisters(MacroAssembler* masm, SaveFPRegsMode mode) {
       masm->stm(db_w, sp, (kCallerSaved | lr.bit()) & ~scratch1_.bit());
       if (mode == kSaveFPRegs) {
-        CpuFeatures::Scope scope(VFP3);
+        CpuFeatures::Scope scope(VFP2);
         masm->sub(sp,
                   sp,
                   Operand(kDoubleSize * (DwVfpRegister::kNumRegisters - 1)));
@@ -586,7 +586,7 @@ class RecordWriteStub: public CodeStub {
     inline void RestoreCallerSaveRegisters(MacroAssembler*masm,
                                            SaveFPRegsMode mode) {
       if (mode == kSaveFPRegs) {
-        CpuFeatures::Scope scope(VFP3);
+        CpuFeatures::Scope scope(VFP2);
         // Restore all VFP registers except d0.
         for (int i = DwVfpRegister::kNumRegisters - 1; i > 0; i--) {
           DwVfpRegister reg = DwVfpRegister::from_code(i);