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LibJS: Add fast-path for Int32 values in Math.abs()

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This function becomes very simple when the input is already an Int32.

2.3% speed-up on Kraken/imaging-gaussian-blur.js :^)
This commit is contained in:
Andreas Kling 2023-10-04 15:31:48 +02:00
parent b53a633388
commit 14a9cfef4d
1 changed files with 7 additions and 1 deletions
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8
Userland/Libraries/LibJS/Runtime/MathObject.cpp
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@ -79,8 +79,14 @@ void MathObject::initialize(Realm& realm)
// 21.3.2.1 Math.abs ( x ), https://tc39.es/ecma262/#sec-math.abs
JS_DEFINE_NATIVE_FUNCTION(MathObject::abs)
{
auto x = vm.argument(0);
// OPTIMIZATION: Fast path for Int32 values.
if (x.is_int32())
return Value(AK::abs(x.as_i32()));
// Let n be ? ToNumber(x).
auto number = TRY(vm.argument(0).to_number(vm));
auto number = TRY(x.to_number(vm));
// 2. If n is NaN, return NaN.
if (number.is_nan())