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LibJS: Add Math.clz32()

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Linus Groh 2020-05-18 16:04:38 +01:00 • committed by Andreas Kling
parent 452dbbc463
commit b3090678a9
3 changed files with 63 additions and 0 deletions
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12
Libraries/LibJS/Runtime/MathObject.cpp
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Linus Groh <mail@linusgroh.de>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -53,6 +54,7 @@ MathObject::MathObject()
put_native_function("exp", exp, 1, attr);
put_native_function("expm1", expm1, 1, attr);
put_native_function("sign", sign, 1, attr);
put_native_function("clz32", clz32, 1, attr);
put("E", Value(M_E), 0);
put("LN2", Value(M_LN2), 0);
@ -245,4 +247,14 @@ Value MathObject::sign(Interpreter& interpreter)
return js_nan();
}
Value MathObject::clz32(Interpreter& interpreter)
{
auto number = interpreter.argument(0).to_number(interpreter);
if (interpreter.exception())
return {};
if (!number.is_finite_number() || (unsigned)number.as_double() == 0)
return Value(32);
return Value(__builtin_clz((unsigned)number.as_double()));
}
}