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MIPS: Avoid Unnecessary Smi Checks.

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Port r15344 (9fd1942)

BUG=

Review URL: https://codereview.chromium.org/17887007
Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15345 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
palfia@homejinni.com 2013-06-26 20:22:41 +00:00
parent 21cd74eaa2
commit 90d0b6cd97
4 changed files with 35 additions and 19 deletions
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30
src/mips/lithium-codegen-mips.cc
View File

@ -1709,9 +1709,11 @@ void LCodeGen::DoValueOf(LValueOf* instr) {
Register map = ToRegister(instr->temp());
Label done;
if (!instr->hydrogen()->value()->IsHeapObject()) {
// If the object is a smi return the object.
__ Move(result, input);
__ JumpIfSmi(input, &done);
}
// If the object is not a value type, return the object.
__ GetObjectType(input, map, map);
@ -2305,8 +2307,11 @@ void LCodeGen::DoIsObjectAndBranch(LIsObjectAndBranch* instr) {
Condition LCodeGen::EmitIsString(Register input,
Register temp1,
Label* is_not_string) {
Label* is_not_string,
SmiCheck check_needed = INLINE_SMI_CHECK) {
if (check_needed == INLINE_SMI_CHECK) {
__ JumpIfSmi(input, is_not_string);
}
__ GetObjectType(input, temp1, temp1);
return lt;
@ -2317,8 +2322,11 @@ void LCodeGen::DoIsStringAndBranch(LIsStringAndBranch* instr) {
Register reg = ToRegister(instr->value());
Register temp1 = ToRegister(instr->temp());
SmiCheck check_needed =
instr->hydrogen()->value()->IsHeapObject()
? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
Condition true_cond =
EmitIsString(reg, temp1, instr->FalseLabel(chunk_));
EmitIsString(reg, temp1, instr->FalseLabel(chunk_), check_needed);
EmitBranch(instr, true_cond, temp1,
Operand(FIRST_NONSTRING_TYPE));
@ -2336,7 +2344,9 @@ void LCodeGen::DoIsUndetectableAndBranch(LIsUndetectableAndBranch* instr) {
Register input = ToRegister(instr->value());
Register temp = ToRegister(instr->temp());
if (!instr->hydrogen()->value()->IsHeapObject()) {
__ JumpIfSmi(input, instr->FalseLabel(chunk_));
}
__ lw(temp, FieldMemOperand(input, HeapObject::kMapOffset));
__ lbu(temp, FieldMemOperand(temp, Map::kBitFieldOffset));
__ And(at, temp, Operand(1 << Map::kIsUndetectable));
@ -2400,7 +2410,9 @@ void LCodeGen::DoHasInstanceTypeAndBranch(LHasInstanceTypeAndBranch* instr) {
Register scratch = scratch0();
Register input = ToRegister(instr->value());
if (!instr->hydrogen()->value()->IsHeapObject()) {
__ JumpIfSmi(input, instr->FalseLabel(chunk_));
}
__ GetObjectType(input, scratch, scratch);
EmitBranch(instr,
@ -2837,9 +2849,9 @@ void LCodeGen::DoStoreContextSlot(LStoreContextSlot* instr) {
__ sw(value, target);
if (instr->hydrogen()->NeedsWriteBarrier()) {
HType type = instr->hydrogen()->value()->type();
SmiCheck check_needed =
type.IsHeapObject() ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
instr->hydrogen()->value()->IsHeapObject()
? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
__ RecordWriteContextSlot(context,
target.offset(),
value,
@ -4127,9 +4139,9 @@ void LCodeGen::DoStoreNamedField(LStoreNamedField* instr) {
// Do the store.
Register value = ToRegister(instr->value());
ASSERT(!object.is(value));
HType type = instr->hydrogen()->value()->type();
SmiCheck check_needed =
type.IsHeapObject() ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
instr->hydrogen()->value()->IsHeapObject()
? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
if (access.IsInobject()) {
__ sw(value, FieldMemOperand(object, offset));
if (instr->hydrogen()->NeedsWriteBarrier()) {
@ -4354,9 +4366,9 @@ void LCodeGen::DoStoreKeyedFixedArray(LStoreKeyed* instr) {
__ sw(value, FieldMemOperand(store_base, offset));
if (instr->hydrogen()->NeedsWriteBarrier()) {
HType type = instr->hydrogen()->value()->type();
SmiCheck check_needed =
type.IsHeapObject() ? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
instr->hydrogen()->value()->IsHeapObject()
? OMIT_SMI_CHECK : INLINE_SMI_CHECK;
// Compute address of modified element and store it into key register.
__ Addu(key, store_base, Operand(offset - kHeapObjectTag));
__ RecordWrite(elements,
@ -5107,9 +5119,11 @@ void LCodeGen::DoCheckSmi(LCheckSmi* instr) {
void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
if (!instr->hydrogen()->value()->IsHeapObject()) {
LOperand* input = instr->value();
__ And(at, ToRegister(input), Operand(kSmiTagMask));
DeoptimizeIf(eq, instr->environment(), at, Operand(zero_reg));
}
}

3
src/mips/lithium-codegen-mips.h
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@ -365,7 +365,8 @@ class LCodeGen BASE_EMBEDDED {
// true and false label should be made, to optimize fallthrough.
Condition EmitIsString(Register input,
Register temp1,
Label* is_not_string);
Label* is_not_string,
SmiCheck check_needed);
// Emits optimized code for %_IsConstructCall().
// Caller should branch on equal condition.

2
src/mips/lithium-mips.cc
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@ -1920,7 +1920,7 @@ LInstruction* LChunkBuilder::DoChange(HChange* instr) {
}
LInstruction* LChunkBuilder::DoCheckNonSmi(HCheckNonSmi* instr) {
LInstruction* LChunkBuilder::DoCheckHeapObject(HCheckHeapObject* instr) {
LOperand* value = UseRegisterAtStart(instr->value());
return AssignEnvironment(new(zone()) LCheckNonSmi(value));
}

1
src/mips/lithium-mips.h
View File

@ -2394,6 +2394,7 @@ class LCheckNonSmi: public LTemplateInstruction<0, 1, 0> {
LOperand* value() { return inputs_[0]; }
DECLARE_CONCRETE_INSTRUCTION(CheckNonSmi, "check-non-smi")
DECLARE_HYDROGEN_ACCESSOR(CheckHeapObject)
};