Relax requirement from VFP3 to VFP2 where possible.

src/arm/code-stubs-arm.h

-// 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:
 //
 //     * 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
 //       with the distribution.
@@ skipping 130 matching lines @@
 };
 
 
 class BinaryOpStub: public CodeStub {
  public:
   BinaryOpStub(Token::Value op, OverwriteMode mode)
       : op_(op),
         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));
   }
 
   BinaryOpStub(
       int key,
       BinaryOpIC::TypeInfo operands_type,
       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) { }
 
  private:
   enum SmiCodeGenerateHeapNumberResults {
     ALLOW_HEAPNUMBER_RESULTS,
     NO_HEAPNUMBER_RESULTS
   };
 
   Token::Value op_;
   OverwriteMode mode_;
-  bool use_vfp3_;
+  bool use_vfp2_;
 
   // Operand type information determined at runtime.
   BinaryOpIC::TypeInfo operands_type_;
   BinaryOpIC::TypeInfo result_type_;
 
   virtual void PrintName(StringStream* stream);
 
   // 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> {};
 
   Major MajorKey() { return BinaryOp; }
   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_);
   }
 
   void Generate(MacroAssembler* masm);
   void GenerateGeneric(MacroAssembler* masm);
   void GenerateSmiSmiOperation(MacroAssembler* masm);
   void GenerateFPOperation(MacroAssembler* masm,
                            bool smi_operands,
                            Label* not_numbers,
@@ skipping 360 matching lines @@
     void Restore(MacroAssembler* masm) {
       masm->pop(scratch1_);
     }
 
     // If we have to call into C then we need to save and restore all caller-
     // saved registers that were not already preserved.  The scratch registers
     // will be restored by other means so we don't bother pushing them here.
     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)));
         // Save all VFP registers except d0.
         for (int i = DwVfpRegister::kNumRegisters - 1; i > 0; i--) {
           DwVfpRegister reg = DwVfpRegister::from_code(i);
           masm->vstr(reg, MemOperand(sp, (i - 1) * kDoubleSize));
         }
       }
     }
 
     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);
           masm->vldr(reg, MemOperand(sp, (i - 1) * kDoubleSize));
         }
         masm->add(sp,
                   sp,
                   Operand(kDoubleSize * (DwVfpRegister::kNumRegisters - 1)));
       }
       masm->ldm(ia_w, sp, (kCallerSaved | lr.bit()) & ~scratch1_.bit());
@@ skipping 294 matching lines @@
 
   class LookupModeBits: public BitField<LookupMode, 0, 1> {};
 
   LookupMode mode_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_CODE_STUBS_ARM_H_