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AK+Everywhere: Replace __builtin bit functions

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In order to reduce our reliance on __builtin_{ffs, clz, ctz, popcount},
this commit removes all calls to these functions and replaces them with
the equivalent functions in AK/BuiltinWrappers.h.
This commit is contained in:
Nick Johnson 2021-12-19 15:46:55 -06:00 • committed by Andreas Kling
parent 26bb3e1acf
commit 08e4a1a4dc
20 changed files with 108 additions and 115 deletions
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3
Userland/Libraries/LibM/math.cpp
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@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/BuiltinWrappers.h>
#include <AK/ExtraMathConstants.h>
#include <AK/Math.h>
#include <AK/Platform.h>
@ -278,7 +279,7 @@ static FloatT internal_scalbn(FloatT x, int exponent) NOEXCEPT
return extractor.d;
}
unsigned leading_mantissa_zeroes = extractor.mantissa == 0 ? 32 : __builtin_clz(extractor.mantissa);
unsigned leading_mantissa_zeroes = extractor.mantissa == 0 ? 32 : count_leading_zeroes(extractor.mantissa);
int shift = min((int)leading_mantissa_zeroes, exponent);
exponent = max(exponent - shift, 0);