MIPS: Save one branch for normal heap number un-tagging.
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
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@ -4801,34 +4801,19 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
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LEnvironment* env,
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NumberUntagDMode mode) {
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Register scratch = scratch0();
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Label load_smi, heap_number, done;
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Label convert, load_smi, done;
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if (mode == NUMBER_CANDIDATE_IS_ANY_TAGGED) {
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// Smi check.
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__ UntagAndJumpIfSmi(scratch, input_reg, &load_smi);
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// Heap number map check.
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__ lw(scratch, FieldMemOperand(input_reg, HeapObject::kMapOffset));
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__ LoadRoot(at, Heap::kHeapNumberMapRootIndex);
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if (!can_convert_undefined_to_nan) {
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DeoptimizeIf(ne, env, scratch, Operand(at));
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if (can_convert_undefined_to_nan) {
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__ Branch(&convert, ne, scratch, Operand(at));
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} else {
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Label heap_number, convert;
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__ Branch(&heap_number, eq, scratch, Operand(at));
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// Convert undefined (and hole) to NaN.
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__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
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DeoptimizeIf(ne, env, input_reg, Operand(at));
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__ bind(&convert);
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__ LoadRoot(at, Heap::kNanValueRootIndex);
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__ ldc1(result_reg, FieldMemOperand(at, HeapNumber::kValueOffset));
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__ Branch(&done);
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__ bind(&heap_number);
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DeoptimizeIf(ne, env, scratch, Operand(at));
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}
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// Heap number to double register conversion.
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// Load heap number.
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__ ldc1(result_reg, FieldMemOperand(input_reg, HeapNumber::kValueOffset));
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if (deoptimize_on_minus_zero) {
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__ mfc1(at, result_reg.low());
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@ -4837,11 +4822,19 @@ void LCodeGen::EmitNumberUntagD(Register input_reg,
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DeoptimizeIf(eq, env, scratch, Operand(HeapNumber::kSignMask));
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}
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__ Branch(&done);
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if (can_convert_undefined_to_nan) {
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__ bind(&convert);
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// Convert undefined (and hole) to NaN.
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__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
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DeoptimizeIf(ne, env, input_reg, Operand(at));
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__ LoadRoot(scratch, Heap::kNanValueRootIndex);
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__ ldc1(result_reg, FieldMemOperand(scratch, HeapNumber::kValueOffset));
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__ Branch(&done);
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}
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} else {
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__ SmiUntag(scratch, input_reg);
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ASSERT(mode == NUMBER_CANDIDATE_IS_SMI);
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}
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// Smi to double register conversion
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__ bind(&load_smi);
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// scratch: untagged value of input_reg
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