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Unified Diff: src/ia32/lithium-codegen-ia32.cc

Issue 22152003: Never hchange nan-hole to hole or hole to nan-hole. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Also change in header Created 7 years, 4 months ago
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Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 0d22bc914168eb9fd10d69db7d34023626b8d5a7..ddb3301873b0dad427e9d6a749d2b19d086f686e 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -2219,6 +2219,13 @@ void LCodeGen::EmitBranch(InstrType instr, Condition cc) {
}
+template<class InstrType>
+void LCodeGen::EmitFalseBranch(InstrType instr, Condition cc) {
+ int false_block = instr->FalseDestination(chunk_);
+ __ j(cc, chunk_->GetAssemblyLabel(false_block));
+}
+
+
void LCodeGen::DoIsNumberAndBranch(LIsNumberAndBranch* instr) {
Representation r = instr->hydrogen()->value()->representation();
if (r.IsSmiOrInteger32() || r.IsDouble()) {
@@ -2469,6 +2476,46 @@ void LCodeGen::DoCmpObjectEqAndBranch(LCmpObjectEqAndBranch* instr) {
}
+void LCodeGen::DoCmpHoleAndBranch(LCmpHoleAndBranch* instr) {
+ if (instr->hydrogen()->representation().IsTagged()) {
+ Register input_reg = ToRegister(instr->object());
+ __ cmp(input_reg, factory()->the_hole_value());
+ EmitBranch(instr, equal);
+ return;
+ }
+
+ bool use_sse2 = CpuFeatures::IsSupported(SSE2);
+ if (use_sse2) {
+ CpuFeatureScope scope(masm(), SSE2);
+ XMMRegister input_reg = ToDoubleRegister(instr->object());
+ __ ucomisd(input_reg, input_reg);
+ } else {
+ // Put the value to the top of stack
+ X87Register src = ToX87Register(instr->object());
+ X87LoadForUsage(src);
+ __ fld(0);
+ __ fld(0);
+ __ FCmp();
+ }
+
+ EmitFalseBranch(instr, parity_odd);
+
+ __ sub(esp, Immediate(kDoubleSize));
+ if (use_sse2) {
+ CpuFeatureScope scope(masm(), SSE2);
+ XMMRegister input_reg = ToDoubleRegister(instr->object());
+ __ movdbl(MemOperand(esp, 0), input_reg);
+ } else {
+ __ fld(0);
+ __ fstp_d(MemOperand(esp, 0));
+ }
+
+ __ add(esp, Immediate(kDoubleSize));
+ __ cmp(MemOperand(esp, -sizeof(kHoleNanUpper32)), Immediate(kHoleNanUpper32));
+ EmitBranch(instr, equal);
+}
+
+
Condition LCodeGen::EmitIsObject(Register input,
Register temp1,
Label* is_not_object,
@@ -5069,13 +5116,6 @@ void LCodeGen::DoNumberTagD(LNumberTagD* instr) {
Register reg = ToRegister(instr->result());
- bool convert_hole = false;
- HValue* change_input = instr->hydrogen()->value();
- if (change_input->IsLoadKeyed()) {
- HLoadKeyed* load = HLoadKeyed::cast(change_input);
- convert_hole = load->UsesMustHandleHole();
- }
-
bool use_sse2 = CpuFeatures::IsSupported(SSE2);
if (!use_sse2) {
// Put the value to the top of stack
@@ -5083,54 +5123,6 @@ void LCodeGen::DoNumberTagD(LNumberTagD* instr) {
X87LoadForUsage(src);
}
- Label no_special_nan_handling;
- Label done;
- if (convert_hole) {
- if (use_sse2) {
- CpuFeatureScope scope(masm(), SSE2);
- XMMRegister input_reg = ToDoubleRegister(instr->value());
- __ ucomisd(input_reg, input_reg);
- } else {
- __ fld(0);
- __ fld(0);
- __ FCmp();
- }
-
- __ j(parity_odd, &no_special_nan_handling);
- __ sub(esp, Immediate(kDoubleSize));
- if (use_sse2) {
- CpuFeatureScope scope(masm(), SSE2);
- XMMRegister input_reg = ToDoubleRegister(instr->value());
- __ movdbl(MemOperand(esp, 0), input_reg);
- } else {
- __ fld(0);
- __ fstp_d(MemOperand(esp, 0));
- }
- __ cmp(MemOperand(esp, sizeof(kHoleNanLower32)),
- Immediate(kHoleNanUpper32));
- Label canonicalize;
- __ j(not_equal, &canonicalize);
- __ add(esp, Immediate(kDoubleSize));
- __ mov(reg, factory()->the_hole_value());
- if (!use_sse2) {
- __ fstp(0);
- }
- __ jmp(&done);
- __ bind(&canonicalize);
- __ add(esp, Immediate(kDoubleSize));
- ExternalReference nan =
- ExternalReference::address_of_canonical_non_hole_nan();
- if (use_sse2) {
- CpuFeatureScope scope(masm(), SSE2);
- XMMRegister input_reg = ToDoubleRegister(instr->value());
- __ movdbl(input_reg, Operand::StaticVariable(nan));
- } else {
- __ fstp(0);
- __ fld_d(Operand::StaticVariable(nan));
- }
- }
-
- __ bind(&no_special_nan_handling);
DeferredNumberTagD* deferred = new(zone()) DeferredNumberTagD(this, instr);
if (FLAG_inline_new) {
Register tmp = ToRegister(instr->temp());
@@ -5146,7 +5138,6 @@ void LCodeGen::DoNumberTagD(LNumberTagD* instr) {
} else {
__ fstp_d(FieldOperand(reg, HeapNumber::kValueOffset));
}
- __ bind(&done);
}
@@ -5196,23 +5187,21 @@ void LCodeGen::DoSmiUntag(LSmiUntag* instr) {
void LCodeGen::EmitNumberUntagDNoSSE2(Register input_reg,
Register temp_reg,
X87Register res_reg,
- bool allow_undefined_as_nan,
+ bool can_convert_undefined_to_nan,
bool deoptimize_on_minus_zero,
LEnvironment* env,
NumberUntagDMode mode) {
Label load_smi, done;
X87PrepareToWrite(res_reg);
- STATIC_ASSERT(NUMBER_CANDIDATE_IS_ANY_TAGGED_CONVERT_HOLE >
- NUMBER_CANDIDATE_IS_ANY_TAGGED);
- if (mode >= NUMBER_CANDIDATE_IS_ANY_TAGGED) {
+ if (mode == NUMBER_CANDIDATE_IS_ANY_TAGGED) {
// Smi check.
__ JumpIfSmi(input_reg, &load_smi, Label::kNear);
// Heap number map check.
__ cmp(FieldOperand(input_reg, HeapObject::kMapOffset),
factory()->heap_number_map());
- if (!allow_undefined_as_nan) {
+ if (!can_convert_undefined_to_nan) {
DeoptimizeIf(not_equal, env);
} else {
Label heap_number, convert;
@@ -5220,10 +5209,6 @@ void LCodeGen::EmitNumberUntagDNoSSE2(Register input_reg,
// Convert undefined (or hole) to NaN.
__ cmp(input_reg, factory()->undefined_value());
- if (mode == NUMBER_CANDIDATE_IS_ANY_TAGGED_CONVERT_HOLE) {
- __ j(equal, &convert, Label::kNear);
- __ cmp(input_reg, factory()->the_hole_value());
- }
DeoptimizeIf(not_equal, env);
__ bind(&convert);
@@ -5270,22 +5255,20 @@ void LCodeGen::EmitNumberUntagDNoSSE2(Register input_reg,
void LCodeGen::EmitNumberUntagD(Register input_reg,
Register temp_reg,
XMMRegister result_reg,
- bool allow_undefined_as_nan,
+ bool can_convert_undefined_to_nan,
bool deoptimize_on_minus_zero,
LEnvironment* env,
NumberUntagDMode mode) {
Label load_smi, done;
- STATIC_ASSERT(NUMBER_CANDIDATE_IS_ANY_TAGGED_CONVERT_HOLE >
- NUMBER_CANDIDATE_IS_ANY_TAGGED);
- if (mode >= NUMBER_CANDIDATE_IS_ANY_TAGGED) {
+ if (mode == NUMBER_CANDIDATE_IS_ANY_TAGGED) {
// Smi check.
__ JumpIfSmi(input_reg, &load_smi, Label::kNear);
// Heap number map check.
__ cmp(FieldOperand(input_reg, HeapObject::kMapOffset),
factory()->heap_number_map());
- if (!allow_undefined_as_nan) {
+ if (!can_convert_undefined_to_nan) {
DeoptimizeIf(not_equal, env);
} else {
Label heap_number, convert;
@@ -5293,10 +5276,6 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
// Convert undefined (and hole) to NaN.
__ cmp(input_reg, factory()->undefined_value());
- if (mode == NUMBER_CANDIDATE_IS_ANY_TAGGED_CONVERT_HOLE) {
- __ j(equal, &convert, Label::kNear);
- __ cmp(input_reg, factory()->the_hole_value());
- }
DeoptimizeIf(not_equal, env);
__ bind(&convert);
@@ -5621,16 +5600,9 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
instr->hydrogen()->deoptimize_on_minus_zero();
Register temp_reg = deoptimize_on_minus_zero ? ToRegister(temp) : no_reg;
- NumberUntagDMode mode = NUMBER_CANDIDATE_IS_ANY_TAGGED;
HValue* value = instr->hydrogen()->value();
- if (value->representation().IsSmi()) {
- mode = NUMBER_CANDIDATE_IS_SMI;
- } else if (value->IsLoadKeyed()) {
- HLoadKeyed* load = HLoadKeyed::cast(value);
- if (load->UsesMustHandleHole()) {
- mode = NUMBER_CANDIDATE_IS_ANY_TAGGED_CONVERT_HOLE;
- }
- }
+ NumberUntagDMode mode = value->representation().IsSmi()
+ ? NUMBER_CANDIDATE_IS_SMI : NUMBER_CANDIDATE_IS_ANY_TAGGED;
if (CpuFeatures::IsSupported(SSE2)) {
CpuFeatureScope scope(masm(), SSE2);
@@ -5638,7 +5610,7 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
EmitNumberUntagD(input_reg,
temp_reg,
result_reg,
- instr->hydrogen()->allow_undefined_as_nan(),
+ instr->hydrogen()->can_convert_undefined_to_nan(),
deoptimize_on_minus_zero,
instr->environment(),
mode);
@@ -5646,7 +5618,7 @@ void LCodeGen::DoNumberUntagD(LNumberUntagD* instr) {
EmitNumberUntagDNoSSE2(input_reg,
temp_reg,
ToX87Register(instr->result()),
- instr->hydrogen()->allow_undefined_as_nan(),
+ instr->hydrogen()->can_convert_undefined_to_nan(),
deoptimize_on_minus_zero,
instr->environment(),
mode);
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