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

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Unified Diff: src/x64/full-codegen-x64.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/x64/full-codegen-x64.cc

diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc

index b146809a24e19a745a5d3810b97ad4bcff8412d9..adee973a266de4f0001deb395966f2b70b325bed 100644

--- a/src/x64/full-codegen-x64.cc

+++ b/src/x64/full-codegen-x64.cc

@@ -3073,8 +3073,8 @@ void FullCodeGenerator::EmitIsMinusZero(CallRuntime* expr) {

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

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

__ cmpl(FieldOperand(rax, HeapNumber::kExponentOffset),

- Immediate(0x80000000));

- __ j(not_equal, if_false);

+ Immediate(0x1));

+ __ j(no_overflow, if_false);

__ cmpl(FieldOperand(rax, HeapNumber::kMantissaOffset),

Immediate(0x00000000));

PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);

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