MIPS: Never hchange nan-hole to hole or hole to nan-hole. Only allow changing...

MIPS: Never hchange nan-hole to hole or hole to nan-hole. Only allow changing hole to nan if all uses allow undefined as nan.

Port r16183 (1858bc57)

BUG=

Review URL: https://codereview.chromium.org/23130006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16200 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-codegen-mips.h

@@ -277,16 +277,16 @@ class LCodeGen BASE_EMBEDDED {
 
   void RegisterEnvironmentForDeoptimization(LEnvironment* environment,
                                             Safepoint::DeoptMode mode);
-  void DeoptimizeIf(Condition cc,
+  void DeoptimizeIf(Condition condition,
                     LEnvironment* environment,
                     Deoptimizer::BailoutType bailout_type,
                     Register src1 = zero_reg,
                     const Operand& src2 = Operand(zero_reg));
-  void DeoptimizeIf(Condition cc,
+  void DeoptimizeIf(Condition condition,
                     LEnvironment* environment,
                     Register src1 = zero_reg,
                     const Operand& src2 = Operand(zero_reg));
-  void ApplyCheckIf(Condition cc,
+  void ApplyCheckIf(Condition condition,
                     LBoundsCheck* check,
                     Register src1 = zero_reg,
                     const Operand& src2 = Operand(zero_reg));
@@ -329,14 +329,19 @@ class LCodeGen BASE_EMBEDDED {
   void EmitGoto(int block);
   template<class InstrType>
   void EmitBranch(InstrType instr,
-                  Condition cc,
+                  Condition condition,
                   Register src1,
                   const Operand& src2);
   template<class InstrType>
   void EmitBranchF(InstrType instr,
-                   Condition cc,
+                   Condition condition,
                    FPURegister src1,
                    FPURegister src2);
+  template<class InstrType>
+  void EmitFalseBranchF(InstrType instr,
+                        Condition condition,
+                        FPURegister src1,
+                        FPURegister src2);
   void EmitCmpI(LOperand* left, LOperand* right);
   void EmitNumberUntagD(Register input,
                         DoubleRegister result,

src/mips/lithium-mips.cc

@@ -1652,6 +1652,13 @@ LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
 }
 
 
+LInstruction* LChunkBuilder::DoCompareHoleAndBranch(
+    HCompareHoleAndBranch* instr) {
+  LOperand* object = UseRegisterAtStart(instr->object());
+  return new(zone()) LCmpHoleAndBranch(object);
+}
+
+
 LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   LOperand* temp = TempRegister();

src/mips/lithium-mips.h

@@ -74,6 +74,7 @@ class LCodeGen;
   V(ClassOfTestAndBranch)                       \
   V(CompareNumericAndBranch)                    \
   V(CmpObjectEqAndBranch)                       \
+  V(CmpHoleAndBranch)                           \
   V(CmpMapAndBranch)                            \
   V(CmpT)                                       \
   V(ConstantD)                                  \
@@ -887,12 +888,24 @@ class LCmpObjectEqAndBranch: public LControlInstruction<2, 0> {
   LOperand* left() { return inputs_[0]; }
   LOperand* right() { return inputs_[1]; }
 
-  DECLARE_CONCRETE_INSTRUCTION(CmpObjectEqAndBranch,
-                               "cmp-object-eq-and-branch")
+  DECLARE_CONCRETE_INSTRUCTION(CmpObjectEqAndBranch, "cmp-object-eq-and-branch")
   DECLARE_HYDROGEN_ACCESSOR(CompareObjectEqAndBranch)
 };
 
 
+class LCmpHoleAndBranch: public LControlInstruction<1, 0> {
+ public:
+  explicit LCmpHoleAndBranch(LOperand* object) {
+    inputs_[0] = object;
+  }
+
+  LOperand* object() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(CmpHoleAndBranch, "cmp-hole-and-branch")
+  DECLARE_HYDROGEN_ACCESSOR(CompareHoleAndBranch)
+};
+
+
 class LIsObjectAndBranch: public LControlInstruction<1, 1> {
  public:
   LIsObjectAndBranch(LOperand* value, LOperand* temp) {

src/mips/macro-assembler-mips.h

@@ -235,6 +235,14 @@ class MacroAssembler: public Assembler {
     mfc1(dst_high, FPURegister::from_code(src.code() + 1));
   }
 
+  inline void FmoveHigh(Register dst_high, FPURegister src) {
+    mfc1(dst_high, FPURegister::from_code(src.code() + 1));
+  }
+
+  inline void FmoveLow(Register dst_low, FPURegister src) {
+    mfc1(dst_low, src);
+  }
+
   inline void Move(FPURegister dst, Register src_low, Register src_high) {
     mtc1(src_low, dst);
     mtc1(src_high, FPURegister::from_code(dst.code() + 1));