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

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Unified Diff: src/x64/code-stubs-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/code-stubs-x64.cc

diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc

index d1ea51bf8bc3b435acab16642190cf0a04a73cfc..4056261605d3ae04888a038aaec072045ae0d189 100644

--- a/src/x64/code-stubs-x64.cc

+++ b/src/x64/code-stubs-x64.cc

@@ -709,8 +709,8 @@ void MathPowStub::Generate(MacroAssembler* masm) {

__ bind(&try_arithmetic_simplification);

__ cvttsd2si(exponent, double_exponent);

// Skip to runtime if possibly NaN (indicated by the indefinite integer).

- __ cmpl(exponent, Immediate(0x80000000u));

- __ j(equal, &call_runtime);

+ __ cmpl(exponent, Immediate(0x1));

+ __ j(overflow, &call_runtime);

if (exponent_type_ == ON_STACK) {

// Detect square root case. Crankshaft detects constant +/-0.5 at

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