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AK: Use builtins in fabs implementation and move it to the top
Both GCC and Clang inline this function to use bit-wise logic and/or appropriate instructions even on -O0 and allow their use in a constexpr context, see https://godbolt.org/z/de1393vha
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AK/Math.h
29
AK/Math.h
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@ -81,6 +81,18 @@ constexpr size_t product_odd() { return value * product_odd<value - 2>(); }
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return res; \
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}
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template<FloatingPoint T>
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constexpr T fabs(T x)
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{
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// Both GCC and Clang inline fabs by default, so this is just a cmath like wrapper
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if constexpr (IsSame<T, long double>)
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return __builtin_fabsl(x);
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if constexpr (IsSame<T, double>)
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return __builtin_fabs(x);
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if constexpr (IsSame<T, float>)
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return __builtin_fabsf(x);
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}
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namespace Rounding {
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template<FloatingPoint T>
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constexpr T ceil(T num)
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@ -494,23 +506,6 @@ constexpr T cbrt(T x)
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return r;
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}
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template<FloatingPoint T>
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constexpr T fabs(T x)
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{
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if (is_constant_evaluated())
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return x < 0 ? -x : x;
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#if ARCH(X86_64)
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asm(
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"fabs"
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: "+t"(x));
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return x;
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#elif ARCH(AARCH64)
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AARCH64_INSTRUCTION(fabs, x);
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#else
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return __builtin_fabs(x);
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#endif
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}
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namespace Trigonometry {
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template<FloatingPoint T>
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