MIPS: Implement HChange support for Smis and use it in Load/StoreNameField

Port r14765 (22625125)

BUG=

Review URL: https://codereview.chromium.org/15781006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14782 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-codegen-mips.cc

@@ -500,7 +500,7 @@ DoubleRegister LCodeGen::EmitLoadDoubleRegister(LOperand* op,
 
 Handle<Object> LCodeGen::ToHandle(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
-  ASSERT(chunk_->LookupLiteralRepresentation(op).IsTagged());
+  ASSERT(chunk_->LookupLiteralRepresentation(op).IsSmiOrTagged());
   return constant->handle();
 }
 
@@ -510,6 +510,11 @@ bool LCodeGen::IsInteger32(LConstantOperand* op) const {
 }
 
 
+bool LCodeGen::IsSmi(LConstantOperand* op) const {
+  return chunk_->LookupLiteralRepresentation(op).IsSmi();
+}
+
+
 int LCodeGen::ToInteger32(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
   return constant->Integer32Value();
@@ -1837,7 +1842,7 @@ void LCodeGen::DoBranch(LBranch* instr) {
   int false_block = chunk_->LookupDestination(instr->false_block_id());
 
   Representation r = instr->hydrogen()->value()->representation();
-  if (r.IsInteger32()) {
+  if (r.IsInteger32() || r.IsSmi()) {
     Register reg = ToRegister(instr->value());
     EmitBranch(true_block, false_block, ne, reg, Operand(zero_reg));
   } else if (r.IsDouble()) {
@@ -3898,13 +3903,7 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
 
   Handle<Map> transition = instr->transition();
 
-  if (FLAG_track_fields && representation.IsSmi()) {
-    Register value = ToRegister(instr->value());
-    __ SmiTagCheckOverflow(value, value, scratch);
-    if (!instr->hydrogen()->value()->range()->IsInSmiRange()) {
-      DeoptimizeIf(lt, instr->environment(), scratch, Operand(zero_reg));
-    }
-  } else if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
+  if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
     Register value = ToRegister(instr->value());
     if (!instr->hydrogen()->value()->type().IsHeapObject()) {
       __ And(scratch, value, Operand(kSmiTagMask));
@@ -4407,6 +4406,21 @@ void LCodeGen::DoInteger32ToDouble(LInteger32ToDouble* instr) {
 }
 
 
+void LCodeGen::DoInteger32ToSmi(LInteger32ToSmi* instr) {
+  LOperand* input = instr->value();
+  ASSERT(input->IsRegister());
+  LOperand* output = instr->result();
+  ASSERT(output->IsRegister());
+  Register scratch = scratch0();
+
+  __ SmiTagCheckOverflow(ToRegister(output), ToRegister(input), scratch);
+  if (!instr->hydrogen()->value()->HasRange() ||
+      !instr->hydrogen()->value()->range()->IsInSmiRange()) {
+    DeoptimizeIf(lt, instr->environment(), scratch, Operand(zero_reg));
+  }
+}
+
+
 void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
   LOperand* input = instr->value();
   LOperand* output = instr->result();
@@ -4866,7 +4880,59 @@ void LCodeGen::DoDoubleToI(LDoubleToI* instr) {
 
     // Deopt if the operation did not succeed (except_flag != 0).
     DeoptimizeIf(ne, instr->environment(), except_flag, Operand(zero_reg));
+
+    if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+      Label done;
+      __ Branch(&done, ne, result_reg, Operand(zero_reg));
+      __ mfc1(scratch1, double_input.high());
+      __ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
+      DeoptimizeIf(ne, instr->environment(), scratch1, Operand(zero_reg));
+      __ bind(&done);
+    }
+  }
+}
+
+
+void LCodeGen::DoDoubleToSmi(LDoubleToSmi* instr) {
+  Register result_reg = ToRegister(instr->result());
+  Register scratch1 = scratch0();
+  Register scratch2 = ToRegister(instr->temp());
+  DoubleRegister double_input = ToDoubleRegister(instr->value());
+
+  if (instr->truncating()) {
+    Register scratch3 = ToRegister(instr->temp2());
+    FPURegister single_scratch = double_scratch0().low();
+    __ EmitECMATruncate(result_reg,
+                        double_input,
+                        single_scratch,
+                        scratch1,
+                        scratch2,
+                        scratch3);
+  } else {
+    Register except_flag = scratch2;
+
+    __ EmitFPUTruncate(kRoundToMinusInf,
+                       result_reg,
+                       double_input,
+                       scratch1,
+                       double_scratch0(),
+                       except_flag,
+                       kCheckForInexactConversion);
+
+    // Deopt if the operation did not succeed (except_flag != 0).
+    DeoptimizeIf(ne, instr->environment(), except_flag, Operand(zero_reg));
+
+    if (instr->hydrogen()->CheckFlag(HValue::kBailoutOnMinusZero)) {
+      Label done;
+      __ Branch(&done, ne, result_reg, Operand(zero_reg));
+      __ mfc1(scratch1, double_input.high());
+      __ And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
+      DeoptimizeIf(ne, instr->environment(), scratch1, Operand(zero_reg));
+      __ bind(&done);
+    }
   }
+  __ SmiTagCheckOverflow(result_reg, result_reg, scratch1);
+  DeoptimizeIf(lt, instr->environment(), scratch1, Operand(zero_reg));
 }
 
 

src/mips/lithium-codegen-mips.h

@@ -125,6 +125,7 @@ class LCodeGen BASE_EMBEDDED {
   MemOperand ToHighMemOperand(LOperand* op) const;
 
   bool IsInteger32(LConstantOperand* op) const;
+  bool IsSmi(LConstantOperand* op) const;
   Handle<Object> ToHandle(LConstantOperand* op) const;
 
   // Try to generate code for the entire chunk, but it may fail if the

src/mips/lithium-mips.cc

@@ -1760,12 +1760,24 @@ LInstruction* LChunkBuilder::DoForceRepresentation(HForceRepresentation* bad) {
 LInstruction* LChunkBuilder::DoChange(HChange* instr) {
   Representation from = instr->from();
   Representation to = instr->to();
+  if (from.IsSmi()) {
+    if (to.IsTagged()) {
+      LOperand* value = UseRegister(instr->value());
+      return DefineSameAsFirst(new(zone()) LDummyUse(value));
+    }
+    from = Representation::Tagged();
+  }
   if (from.IsTagged()) {
     if (to.IsDouble()) {
       info()->MarkAsDeferredCalling();
       LOperand* value = UseRegister(instr->value());
       LNumberUntagD* res = new(zone()) LNumberUntagD(value);
       return AssignEnvironment(DefineAsRegister(res));
+    } else if (to.IsSmi()) {
+      HValue* val = instr->value();
+      LOperand* value = UseRegisterAtStart(val);
+      return AssignEnvironment(
+          DefineSameAsFirst(new(zone()) LCheckSmi(value)));
     } else {
       ASSERT(to.IsInteger32());
       LOperand* value = NULL;
@@ -1807,6 +1819,10 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
       LNumberTagD* result = new(zone()) LNumberTagD(value, temp1, temp2);
       Define(result, result_temp);
       return AssignPointerMap(result);
+    } else if (to.IsSmi()) {
+      LOperand* value = UseRegister(instr->value());
+      return AssignEnvironment(DefineAsRegister(new(zone()) LDoubleToSmi(value,
+          TempRegister(), TempRegister())));
     } else {
       ASSERT(to.IsInteger32());
       LOperand* value = UseRegister(instr->value());
@@ -1829,6 +1845,15 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
         LNumberTagI* result = new(zone()) LNumberTagI(value);
         return AssignEnvironment(AssignPointerMap(DefineAsRegister(result)));
       }
+    } else if (to.IsSmi()) {
+      HValue* val = instr->value();
+      LOperand* value = UseRegister(val);
+      LInstruction* result =
+          DefineSameAsFirst(new(zone()) LInteger32ToSmi(value));
+      if (val->HasRange() && val->range()->IsInSmiRange()) {
+        return result;
+      }
+      return AssignEnvironment(result);
     } else {
       ASSERT(to.IsDouble());
       if (instr->value()->CheckFlag(HInstruction::kUint32)) {
@@ -1923,7 +1948,7 @@ LInstruction* LChunkBuilder::DoConstant(HConstant* instr) {
     return DefineAsRegister(new(zone()) LConstantI);
   } else if (r.IsDouble()) {
     return DefineAsRegister(new(zone()) LConstantD);
-  } else if (r.IsTagged()) {
+  } else if (r.IsTagged() || r.IsSmi()) {
     return DefineAsRegister(new(zone()) LConstantT);
   } else {
     UNREACHABLE();

src/mips/lithium-mips.h

@@ -95,6 +95,7 @@ class LCodeGen;
   V(Deoptimize)                                 \
   V(DivI)                                       \
   V(DoubleToI)                                  \
+  V(DoubleToSmi)                                \
   V(DummyUse)                                   \
   V(ElementsKind)                               \
   V(FixedArrayBaseLength)                       \
@@ -111,6 +112,7 @@ class LCodeGen;
   V(InstanceSize)                               \
   V(InstructionGap)                             \
   V(Integer32ToDouble)                          \
+  V(Integer32ToSmi)                             \
   V(Uint32ToDouble)                             \
   V(InvokeFunction)                             \
   V(IsConstructCallAndBranch)                   \
@@ -1901,6 +1903,19 @@ class LInteger32ToDouble: public LTemplateInstruction<1, 1, 0> {
 };
 
 
+class LInteger32ToSmi: public LTemplateInstruction<1, 1, 0> {
+ public:
+  explicit LInteger32ToSmi(LOperand* value) {
+    inputs_[0] = value;
+  }
+
+  LOperand* value() { return inputs_[0]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(Integer32ToSmi, "int32-to-smi")
+  DECLARE_HYDROGEN_ACCESSOR(Change)
+};
+
+
 class LUint32ToDouble: public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LUint32ToDouble(LOperand* value) {
@@ -1954,6 +1969,25 @@ class LNumberTagD: public LTemplateInstruction<1, 1, 2> {
 };
 
 
+class LDoubleToSmi: public LTemplateInstruction<1, 1, 2> {
+ public:
+  LDoubleToSmi(LOperand* value, LOperand* temp, LOperand* temp2) {
+    inputs_[0] = value;
+    temps_[0] = temp;
+    temps_[1] = temp2;
+  }
+
+  LOperand* value() { return inputs_[0]; }
+  LOperand* temp() { return temps_[0]; }
+  LOperand* temp2() { return temps_[1]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(DoubleToSmi, "double-to-smi")
+  DECLARE_HYDROGEN_ACCESSOR(UnaryOperation)
+
+  bool truncating() { return hydrogen()->CanTruncateToInt32(); }
+};
+
+
 // Sometimes truncating conversion from a tagged value to an int32.
 class LDoubleToI: public LTemplateInstruction<1, 1, 2> {
  public:
@@ -2294,7 +2328,7 @@ class LCheckPrototypeMaps: public LTemplateInstruction<0, 0, 2> {
 };
 
 
-class LCheckSmi: public LTemplateInstruction<0, 1, 0> {
+class LCheckSmi: public LTemplateInstruction<1, 1, 0> {
  public:
   explicit LCheckSmi(LOperand* value) {
     inputs_[0] = value;