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Slightly improved register assignment for %_IsObject on IA32 and ARM.

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The new approach uses one temp register instead of two on IA32. The ARM
instructions are modified so the input can be UseAtStart again.
Review URL: http://codereview.chromium.org/7274025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8451 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
fschneider@chromium.org 2011-06-28 14:21:55 +00:00
parent e859416b9f
commit 2760bd2927
8 changed files with 22 additions and 37 deletions
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2
src/arm/lithium-arm.cc
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@ -1098,7 +1098,7 @@ LInstruction* LChunkBuilder::DoTest(HTest* instr) {
HIsObject* compare = HIsObject::cast(v);
ASSERT(compare->value()->representation().IsTagged());
LOperand* temp = TempRegister();
return new LIsObjectAndBranch(UseRegister(compare->value()), temp);
return new LIsObjectAndBranch(UseRegisterAtStart(compare->value()), temp);
} else if (v->IsCompareObjectEq()) {
HCompareObjectEq* compare = HCompareObjectEq::cast(v);
return new LCmpObjectEqAndBranch(UseRegisterAtStart(compare->left()),

4
src/arm/lithium-arm.h
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@ -705,7 +705,7 @@ class LIsNullAndBranch: public LControlInstruction<1, 0> {
};
class LIsObject: public LTemplateInstruction<1, 1, 1> {
class LIsObject: public LTemplateInstruction<1, 1, 0> {
public:
explicit LIsObject(LOperand* value) {
inputs_[0] = value;
@ -715,7 +715,7 @@ class LIsObject: public LTemplateInstruction<1, 1, 1> {
};
class LIsObjectAndBranch: public LControlInstruction<1, 2> {
class LIsObjectAndBranch: public LControlInstruction<1, 1> {
public:
LIsObjectAndBranch(LOperand* value, LOperand* temp) {
inputs_[0] = value;

11
src/arm/lithium-codegen-arm.cc
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@ -1796,13 +1796,13 @@ void LCodeGen::DoIsNullAndBranch(LIsNullAndBranch* instr) {
Condition LCodeGen::EmitIsObject(Register input,
Register temp1,
Register temp2,
Label* is_not_object,
Label* is_object) {
Register temp2 = scratch0();
__ JumpIfSmi(input, is_not_object);
__ LoadRoot(temp1, Heap::kNullValueRootIndex);
__ cmp(input, temp1);
__ LoadRoot(temp2, Heap::kNullValueRootIndex);
__ cmp(input, temp2);
__ b(eq, is_object);
// Load map.
@ -1824,10 +1824,9 @@ Condition LCodeGen::EmitIsObject(Register input,
void LCodeGen::DoIsObject(LIsObject* instr) {
Register reg = ToRegister(instr->InputAt(0));
Register result = ToRegister(instr->result());
Register temp = scratch0();
Label is_false, is_true, done;
Condition true_cond = EmitIsObject(reg, result, temp, &is_false, &is_true);
Condition true_cond = EmitIsObject(reg, result, &is_false, &is_true);
__ b(true_cond, &is_true);
__ bind(&is_false);
@ -1852,7 +1851,7 @@ void LCodeGen::DoIsObjectAndBranch(LIsObjectAndBranch* instr) {
Label* false_label = chunk_->GetAssemblyLabel(false_block);
Condition true_cond =
EmitIsObject(reg, temp1, temp2, false_label, true_label);
EmitIsObject(reg, temp1, false_label, true_label);
EmitBranch(true_block, false_block, true_cond);
}

1
src/arm/lithium-codegen-arm.h
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@ -280,7 +280,6 @@ class LCodeGen BASE_EMBEDDED {
// true and false label should be made, to optimize fallthrough.
Condition EmitIsObject(Register input,
Register temp1,
Register temp2,
Label* is_not_object,
Label* is_object);

21
src/ia32/lithium-codegen-ia32.cc
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@ -1637,13 +1637,8 @@ void LCodeGen::DoIsNullAndBranch(LIsNullAndBranch* instr) {
Condition LCodeGen::EmitIsObject(Register input,
Register temp1,
Register temp2,
Label* is_not_object,
Label* is_object) {
ASSERT(!input.is(temp1));
ASSERT(!input.is(temp2));
ASSERT(!temp1.is(temp2));
__ JumpIfSmi(input, is_not_object);
__ cmp(input, isolate()->factory()->null_value());
@ -1651,14 +1646,14 @@ Condition LCodeGen::EmitIsObject(Register input,
__ mov(temp1, FieldOperand(input, HeapObject::kMapOffset));
// Undetectable objects behave like undefined.
__ movzx_b(temp2, FieldOperand(temp1, Map::kBitFieldOffset));
__ test(temp2, Immediate(1 << Map::kIsUndetectable));
__ test_b(FieldOperand(temp1, Map::kBitFieldOffset),
1 << Map::kIsUndetectable);
__ j(not_zero, is_not_object);
__ movzx_b(temp2, FieldOperand(temp1, Map::kInstanceTypeOffset));
__ cmp(temp2, FIRST_NONCALLABLE_SPEC_OBJECT_TYPE);
__ movzx_b(temp1, FieldOperand(temp1, Map::kInstanceTypeOffset));
__ cmp(temp1, FIRST_NONCALLABLE_SPEC_OBJECT_TYPE);
__ j(below, is_not_object);
__ cmp(temp2, LAST_NONCALLABLE_SPEC_OBJECT_TYPE);
__ cmp(temp1, LAST_NONCALLABLE_SPEC_OBJECT_TYPE);
return below_equal;
}
@ -1666,10 +1661,9 @@ Condition LCodeGen::EmitIsObject(Register input,
void LCodeGen::DoIsObject(LIsObject* instr) {
Register reg = ToRegister(instr->InputAt(0));
Register result = ToRegister(instr->result());
Register temp = ToRegister(instr->TempAt(0));
Label is_false, is_true, done;
Condition true_cond = EmitIsObject(reg, result, temp, &is_false, &is_true);
Condition true_cond = EmitIsObject(reg, result, &is_false, &is_true);
__ j(true_cond, &is_true);
__ bind(&is_false);
@ -1686,14 +1680,13 @@ void LCodeGen::DoIsObject(LIsObject* instr) {
void LCodeGen::DoIsObjectAndBranch(LIsObjectAndBranch* instr) {
Register reg = ToRegister(instr->InputAt(0));
Register temp = ToRegister(instr->TempAt(0));
Register temp2 = ToRegister(instr->TempAt(1));
int true_block = chunk_->LookupDestination(instr->true_block_id());
int false_block = chunk_->LookupDestination(instr->false_block_id());
Label* true_label = chunk_->GetAssemblyLabel(true_block);
Label* false_label = chunk_->GetAssemblyLabel(false_block);
Condition true_cond = EmitIsObject(reg, temp, temp2, false_label, true_label);
Condition true_cond = EmitIsObject(reg, temp, false_label, true_label);
EmitBranch(true_block, false_block, true_cond);
}

1
src/ia32/lithium-codegen-ia32.h
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@ -277,7 +277,6 @@ class LCodeGen BASE_EMBEDDED {
// true and false label should be made, to optimize fallthrough.
Condition EmitIsObject(Register input,
Register temp1,
Register temp2,
Label* is_not_object,
Label* is_object);

9
src/ia32/lithium-ia32.cc
View File

@ -1096,11 +1096,8 @@ LInstruction* LChunkBuilder::DoTest(HTest* instr) {
} else if (v->IsIsObject()) {
HIsObject* compare = HIsObject::cast(v);
ASSERT(compare->value()->representation().IsTagged());
LOperand* temp1 = TempRegister();
LOperand* temp2 = TempRegister();
return new LIsObjectAndBranch(UseRegister(compare->value()),
temp1,
temp2);
LOperand* temp = TempRegister();
return new LIsObjectAndBranch(UseRegister(compare->value()), temp);
} else if (v->IsCompareObjectEq()) {
HCompareObjectEq* compare = HCompareObjectEq::cast(v);
return new LCmpObjectEqAndBranch(UseRegisterAtStart(compare->left()),
@ -1546,7 +1543,7 @@ LInstruction* LChunkBuilder::DoIsObject(HIsObject* instr) {
ASSERT(instr->value()->representation().IsTagged());
LOperand* value = UseRegister(instr->value());
return DefineAsRegister(new LIsObject(value, TempRegister()));
return DefineAsRegister(new LIsObject(value));
}

10
src/ia32/lithium-ia32.h
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@ -692,23 +692,21 @@ class LIsNullAndBranch: public LControlInstruction<1, 1> {
};
class LIsObject: public LTemplateInstruction<1, 1, 1> {
class LIsObject: public LTemplateInstruction<1, 1, 0> {
public:
LIsObject(LOperand* value, LOperand* temp) {
explicit LIsObject(LOperand* value) {
inputs_[0] = value;
temps_[0] = temp;
}
DECLARE_CONCRETE_INSTRUCTION(IsObject, "is-object")
};
class LIsObjectAndBranch: public LControlInstruction<1, 2> {
class LIsObjectAndBranch: public LControlInstruction<1, 1> {
public:
LIsObjectAndBranch(LOperand* value, LOperand* temp, LOperand* temp2) {
LIsObjectAndBranch(LOperand* value, LOperand* temp) {
inputs_[0] = value;
temps_[0] = temp;
temps_[1] = temp2;
}
DECLARE_CONCRETE_INSTRUCTION(IsObjectAndBranch, "is-object-and-branch")