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MIPS: Save one branch for normal heap number un-tagging.

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Port r16856 (edeb2d3)

BUG=
R=gergely@homejinni.com

Review URL: https://codereview.chromium.org/24307005

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16871 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
palfia@homejinni.com 2013-09-20 19:05:48 +00:00
parent 6b5e87bd3e
commit ea1aebce1d
1 changed files with 14 additions and 21 deletions
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35
src/mips/lithium-codegen-mips.cc
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@ -4801,34 +4801,19 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
LEnvironment* env,
NumberUntagDMode mode) {
Register scratch = scratch0();
Label load_smi, heap_number, done;
Label convert, load_smi, done;
if (mode == NUMBER_CANDIDATE_IS_ANY_TAGGED) {
// Smi check.
__ UntagAndJumpIfSmi(scratch, input_reg, &load_smi);
// Heap number map check.
__ lw(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
__ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
if (!can_convert_undefined_to_nan) {
DeoptimizeIf(ne, env, scratch, Operand(at));
if (can_convert_undefined_to_nan) {
__ Branch(&convert, ne, scratch, Operand(at));
} else {
Label heap_number, convert;
__ Branch(&heap_number, eq, scratch, Operand(at));
// Convert undefined (and hole) to NaN.
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
DeoptimizeIf(ne, env, input_reg, Operand(at));
__ bind(&convert);
__ LoadRoot(at, Heap::kNanValueRootIndex);
__ ldc1(result_reg, FieldMemOperand(at, HeapNumber::kValueOffset));
__ Branch(&done);
__ bind(&heap_number);
DeoptimizeIf(ne, env, scratch, Operand(at));
}
// Heap number to double register conversion.
// Load heap number.
__ ldc1(result_reg, FieldMemOperand(input_reg, HeapNumber::kValueOffset));
if (deoptimize_on_minus_zero) {
__ mfc1(at, result_reg.low());
@ -4837,11 +4822,19 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
DeoptimizeIf(eq, env, scratch, Operand(HeapNumber::kSignMask));
}
__ Branch(&done);
if (can_convert_undefined_to_nan) {
__ bind(&convert);
// Convert undefined (and hole) to NaN.
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
DeoptimizeIf(ne, env, input_reg, Operand(at));
__ LoadRoot(scratch, Heap::kNanValueRootIndex);
__ ldc1(result_reg, FieldMemOperand(scratch, HeapNumber::kValueOffset));
__ Branch(&done);
}
} else {
__ SmiUntag(scratch, input_reg);
ASSERT(mode == NUMBER_CANDIDATE_IS_SMI);
}
// Smi to double register conversion
__ bind(&load_smi);
// scratch: untagged value of input_reg