Update DoNumberTagI to support x32 port.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/263123002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21726 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/lithium-codegen-x64.cc

@@ -4524,11 +4524,32 @@ void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
 
 
 void LCodeGen::DoNumberTagI(LNumberTagI* instr) {
+  class DeferredNumberTagI V8_FINAL : public LDeferredCode {
+   public:
+    DeferredNumberTagI(LCodeGen* codegen, LNumberTagI* instr)
+        : LDeferredCode(codegen), instr_(instr) { }
+    virtual void Generate() V8_OVERRIDE {
+      codegen()->DoDeferredNumberTagIU(instr_, instr_->value(), instr_->temp1(),
+                                       instr_->temp2(), SIGNED_INT32);
+    }
+    virtual LInstruction* instr() V8_OVERRIDE { return instr_; }
+   private:
+    LNumberTagI* instr_;
+  };
+
   LOperand* input = instr->value();
   ASSERT(input->IsRegister() && input->Equals(instr->result()));
   Register reg = ToRegister(input);
 
-  __ Integer32ToSmi(reg, reg);
+  if (SmiValuesAre32Bits()) {
+    __ Integer32ToSmi(reg, reg);
+  } else {
+    ASSERT(SmiValuesAre31Bits());
+    DeferredNumberTagI* deferred = new(zone()) DeferredNumberTagI(this, instr);
+    __ Integer32ToSmi(reg, reg);
+    __ j(overflow, deferred->entry());
+    __ bind(deferred->exit());
+  }
 }
 
 
@@ -4538,7 +4559,8 @@ void LCodeGen::DoNumberTagU(LNumberTagU* instr) {
     DeferredNumberTagU(LCodeGen* codegen, LNumberTagU* instr)
         : LDeferredCode(codegen), instr_(instr) { }
     virtual void Generate() V8_OVERRIDE {
-      codegen()->DoDeferredNumberTagU(instr_);
+      codegen()->DoDeferredNumberTagIU(instr_, instr_->value(), instr_->temp1(),
+                                       instr_->temp2(), UNSIGNED_INT32);
     }
     virtual LInstruction* instr() V8_OVERRIDE { return instr_; }
    private:
@@ -4557,16 +4579,31 @@ void LCodeGen::DoNumberTagU(LNumberTagU* instr) {
 }
 
 
-void LCodeGen::DoDeferredNumberTagU(LNumberTagU* instr) {
+void LCodeGen::DoDeferredNumberTagIU(LInstruction* instr,
+                                     LOperand* value,
+                                     LOperand* temp1,
+                                     LOperand* temp2,
+                                     IntegerSignedness signedness) {
   Label done, slow;
-  Register reg = ToRegister(instr->value());
-  Register tmp = ToRegister(instr->temp1());
-  XMMRegister temp_xmm = ToDoubleRegister(instr->temp2());
+  Register reg = ToRegister(value);
+  Register tmp = ToRegister(temp1);
+  XMMRegister temp_xmm = ToDoubleRegister(temp2);
 
   // Load value into temp_xmm which will be preserved across potential call to
   // runtime (MacroAssembler::EnterExitFrameEpilogue preserves only allocatable
   // XMM registers on x64).
-  __ LoadUint32(temp_xmm, reg);
+  if (signedness == SIGNED_INT32) {
+    ASSERT(SmiValuesAre31Bits());
+    // There was overflow, so bits 30 and 31 of the original integer
+    // disagree. Try to allocate a heap number in new space and store
+    // the value in there. If that fails, call the runtime system.
+    __ SmiToInteger32(reg, reg);
+    __ xorl(reg, Immediate(0x80000000));
+    __ cvtlsi2sd(temp_xmm, reg);
+  } else {
+    ASSERT(signedness == UNSIGNED_INT32);
+    __ LoadUint32(temp_xmm, reg);
+  }
 
   if (FLAG_inline_new) {
     __ AllocateHeapNumber(reg, tmp, &slow);
@@ -4584,7 +4621,7 @@ void LCodeGen::DoDeferredNumberTagU(LNumberTagU* instr) {
     // Preserve the value of all registers.
     PushSafepointRegistersScope scope(this);
 
-    // NumberTagU uses the context from the frame, rather than
+    // NumberTagIU uses the context from the frame, rather than
     // the environment's HContext or HInlinedContext value.
     // They only call Runtime::kHiddenAllocateHeapNumber.
     // The corresponding HChange instructions are added in a phase that does

src/x64/lithium-codegen-x64.h

@@ -83,7 +83,14 @@ class LCodeGen: public LCodeGenBase {
 
   // Deferred code support.
   void DoDeferredNumberTagD(LNumberTagD* instr);
-  void DoDeferredNumberTagU(LNumberTagU* instr);
+
+  enum IntegerSignedness { SIGNED_INT32, UNSIGNED_INT32 };
+  void DoDeferredNumberTagIU(LInstruction* instr,
+                             LOperand* value,
+                             LOperand* temp1,
+                             LOperand* temp2,
+                             IntegerSignedness signedness);
+
   void DoDeferredTaggedToI(LTaggedToI* instr, Label* done);
   void DoDeferredMathAbsTaggedHeapNumber(LMathAbs* instr);
   void DoDeferredStackCheck(LStackCheck* instr);

src/x64/lithium-x64.cc

@@ -1885,7 +1885,9 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
         return AssignPointerMap(DefineSameAsFirst(result));
       } else {
         LOperand* value = UseRegister(val);
-        LNumberTagI* result = new(zone()) LNumberTagI(value);
+        LOperand* temp1 = SmiValuesAre32Bits() ? NULL : TempRegister();
+        LOperand* temp2 = SmiValuesAre32Bits() ? NULL : FixedTemp(xmm1);
+        LNumberTagI* result = new(zone()) LNumberTagI(value, temp1, temp2);
         return AssignPointerMap(DefineSameAsFirst(result));
       }
     } else if (to.IsSmi()) {

src/x64/lithium-x64.h

@@ -1981,13 +1981,17 @@ class LUint32ToDouble V8_FINAL : public LTemplateInstruction<1, 1, 0> {
 };
 
 
-class LNumberTagI V8_FINAL : public LTemplateInstruction<1, 1, 0> {
+class LNumberTagI V8_FINAL : public LTemplateInstruction<1, 1, 2> {
  public:
-  explicit LNumberTagI(LOperand* value) {
+  LNumberTagI(LOperand* value, LOperand* temp1, LOperand* temp2) {
     inputs_[0] = value;
+    temps_[0] = temp1;
+    temps_[1] = temp2;
   }
 
   LOperand* value() { return inputs_[0]; }
+  LOperand* temp1() { return temps_[0]; }
+  LOperand* temp2() { return temps_[1]; }
 
   DECLARE_CONCRETE_INSTRUCTION(NumberTagI, "number-tag-i")
 };