src/ia32/full-codegen-ia32.cc - Issue 202083002: [ia32/x64] Smaller instruction to check NaN

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

Issue 202083002: [ia32/x64] Smaller instruction to check NaN (Closed) Base URL: git://github.com/v8/v8.git@master

Patch Set: only NaN related code remains Created 6 years, 9 months ago

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Index: src/ia32/full-codegen-ia32.cc

diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc

index 06da7ba0e7d521844523e756106ee2e090756ac6..d529f30e7805e14fd3c947fb307328c4034fb643 100644

--- a/src/ia32/full-codegen-ia32.cc

+++ b/src/ia32/full-codegen-ia32.cc

@@ -3093,8 +3093,8 @@ void FullCodeGenerator::EmitIsMinusZero(CallRuntime* expr) {

Handle<Map> map = masm()->isolate()->factory()->heap_number_map();

__ CheckMap(eax, map, if_false, DO_SMI_CHECK);

- __ cmp(FieldOperand(eax, HeapNumber::kExponentOffset), Immediate(0x80000000));

- __ j(not_equal, if_false);

+ __ cmp(FieldOperand(eax, HeapNumber::kExponentOffset), Immediate(0x1));

+ __ j(no_overflow, if_false);

__ cmp(FieldOperand(eax, HeapNumber::kMantissaOffset), Immediate(0x00000000));

PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);

Split(equal, if_true, if_false, fall_through);

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