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

src/ia32/lithium-codegen-ia32.cc

 // 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
@@ skipping 572 matching lines @@
 
 
 int LCodeGen::ToInteger32(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
   return constant->Integer32Value();
 }
 
 
 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();
 }
 
 
 double LCodeGen::ToDouble(LConstantOperand* op) const {
   HConstant* constant = chunk_->LookupConstant(op);
   ASSERT(constant->HasDoubleValue());
   return constant->DoubleValue();
 }
 
 
 bool LCodeGen::IsInteger32(LConstantOperand* op) const {
   return chunk_->LookupLiteralRepresentation(op).IsInteger32();
 }
 
 
+bool LCodeGen::IsSmi(LConstantOperand* op) const {
+  return chunk_->LookupLiteralRepresentation(op).IsSmi();
+}
+
+
 Operand LCodeGen::ToOperand(LOperand* op) const {
   if (op->IsRegister()) return Operand(ToRegister(op));
   if (op->IsDoubleRegister()) return Operand(ToDoubleRegister(op));
   ASSERT(op->IsStackSlot() || op->IsDoubleStackSlot());
   return Operand(ebp, StackSlotOffset(op->index()));
 }
 
 
 Operand LCodeGen::HighOperand(LOperand* op) {
   ASSERT(op->IsDoubleStackSlot());
@@ skipping 1474 matching lines @@
   }
 }
 
 
 void LCodeGen::DoBranch(LBranch* instr) {
   int true_block = chunk_->LookupDestination(instr->true_block_id());
   int false_block = chunk_->LookupDestination(instr->false_block_id());
   CpuFeatureScope scope(masm(), SSE2);
 
   Representation r = instr->hydrogen()->value()->representation();
-  if (r.IsInteger32()) {
+  if (r.IsInteger32() || r.IsSmi()) {
     Register reg = ToRegister(instr->value());
     __ test(reg, Operand(reg));
     EmitBranch(true_block, false_block, not_zero);
   } else if (r.IsDouble()) {
     XMMRegister reg = ToDoubleRegister(instr->value());
     __ xorps(xmm0, xmm0);
     __ ucomisd(reg, xmm0);
     EmitBranch(true_block, false_block, not_equal);
   } else {
     ASSERT(r.IsTagged());
@@ skipping 2098 matching lines @@
 
   Register object = ToRegister(instr->object());
 
   int offset = instr->offset();
 
   Handle<Map> transition = instr->transition();
 
   if (FLAG_track_fields && representation.IsSmi()) {
     if (instr->value()->IsConstantOperand()) {
       LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
-      if (!IsInteger32(operand_value)) {
+      if (!IsSmi(operand_value)) {
         DeoptimizeIf(no_condition, instr->environment());
       }
-    } else {
-      Register value = ToRegister(instr->value());
-      __ SmiTag(value);
-      if (!instr->hydrogen()->value()->range()->IsInSmiRange()) {
-        DeoptimizeIf(overflow, instr->environment());
-      }
     }
   } else if (FLAG_track_heap_object_fields && representation.IsHeapObject()) {
     if (instr->value()->IsConstantOperand()) {
       LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
       if (IsInteger32(operand_value)) {
         DeoptimizeIf(no_condition, instr->environment());
       }
     } else {
       if (!instr->hydrogen()->value()->type().IsHeapObject()) {
         Register value = ToRegister(instr->value());
@@ skipping 44 matching lines @@
 
   Register write_register = object;
   if (!instr->is_in_object()) {
     write_register = ToRegister(instr->temp());
     __ mov(write_register,
            FieldOperand(object, JSObject::kPropertiesOffset));
   }
 
   if (instr->value()->IsConstantOperand()) {
     LConstantOperand* operand_value = LConstantOperand::cast(instr->value());
-    if (IsInteger32(operand_value)) {
-      // In lithium register preparation, we made sure that the constant integer
-      // operand fits into smi range.
-      Smi* smi_value = Smi::FromInt(ToInteger32(operand_value));
-      __ mov(FieldOperand(write_register, offset), Immediate(smi_value));
-    } else if (operand_value->IsRegister()) {
+    if (operand_value->IsRegister()) {
       __ mov(FieldOperand(write_register, offset), ToRegister(operand_value));
     } else {
       Handle<Object> handle_value = ToHandle(operand_value);
       ASSERT(!instr->hydrogen()->NeedsWriteBarrier());
       __ mov(FieldOperand(write_register, offset), handle_value);
     }
   } else {
     __ mov(FieldOperand(write_register, offset), ToRegister(instr->value()));
   }
 
@@ skipping 450 matching lines @@
     ASSERT(input->IsRegister() || input->IsStackSlot());
     LOperand* output = instr->result();
     ASSERT(output->IsDoubleRegister());
     __ cvtsi2sd(ToDoubleRegister(output), ToOperand(input));
   } else {
     UNREACHABLE();
   }
 }
 
 
+void LCodeGen::DoInteger32ToSmi(LInteger32ToSmi* instr) {
+  Register input = ToRegister(instr->value());
+  __ SmiTag(input);
+  if (!instr->hydrogen()->value()->HasRange() ||
+      !instr->hydrogen()->value()->range()->IsInSmiRange()) {
+    DeoptimizeIf(overflow, instr->environment());
+  }
+}
+
+
 void LCodeGen::DoUint32ToDouble(LUint32ToDouble* instr) {
   CpuFeatureScope scope(masm(), SSE2);
   LOperand* input = instr->value();
   LOperand* output = instr->result();
   LOperand* temp = instr->temp();
 
   __ LoadUint32(ToDoubleRegister(output),
                 ToRegister(input),
                 ToDoubleRegister(temp));
 }
@@ skipping 832 matching lines @@
       // If input was positive, we are ok and return 0, otherwise
       // deoptimize.
       __ and_(result_reg, 1);
       DeoptimizeIf(not_zero, instr->environment());
     }
     __ bind(&done);
   }
 }
 
 
+void LCodeGen::DoDoubleToSmi(LDoubleToSmi* instr) {
+  LOperand* input = instr->value();
+  ASSERT(input->IsDoubleRegister());
+  LOperand* result = instr->result();
+  ASSERT(result->IsRegister());
+  CpuFeatureScope scope(masm(), SSE2);
+
+  XMMRegister input_reg = ToDoubleRegister(input);
+  Register result_reg = ToRegister(result);
+
+  Label done;
+  __ cvttsd2si(result_reg, Operand(input_reg));
+  __ cvtsi2sd(xmm0, Operand(result_reg));
+  __ ucomisd(xmm0, input_reg);
+  DeoptimizeIf(not_equal, instr->environment());
+  DeoptimizeIf(parity_even, instr->environment());  // NaN.
+
+  // The integer converted back is equal to the original. We
+  // only have to test if we got -0 as an input.
+  __ test(result_reg, Operand(result_reg));
+  __ j(not_zero, &done, Label::kNear);
+  __ movmskpd(result_reg, input_reg);
+  // Bit 0 contains the sign of the double in input_reg.
+  // If input was positive, we are ok and return 0, otherwise
+  // deoptimize.
+  __ and_(result_reg, 1);
+  DeoptimizeIf(not_zero, instr->environment());
+  __ bind(&done);
+  __ SmiTag(result_reg);
+  DeoptimizeIf(overflow, instr->environment());
+}
+
+
 void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
   LOperand* input = instr->value();
   __ test(ToOperand(input), Immediate(kSmiTagMask));
   DeoptimizeIf(not_zero, instr->environment());
 }
 
 
 void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
   LOperand* input = instr->value();
   __ test(ToOperand(input), Immediate(kSmiTagMask));
@@ skipping 877 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32