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AK: Use correct builtins for fmod and remainder

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Similar to floor and ceil, we were forcing the values to be doubles here

Also adds a big FIXME about my findings trying to add a general
implementation for these
This commit is contained in:
Hendiadyoin1 2023-07-28 16:58:02 +02:00 committed by Andreas Kling
parent c9808f0d4a
commit 07e4358c63
Notes: sideshowbarker 2024-07-17 06:54:15 +09:00 
Author: https://github.com/Hendiadyoin1
Commit: https://github.com/SerenityOS/serenity/commit/07e4358c63
Pull-request: https://github.com/SerenityOS/serenity/pull/18998
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
Reviewed-by: https://github.com/linusg ✅
1 changed files with 32 additions and 2 deletions
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32
AK/Math.h
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@ -391,12 +391,37 @@ constexpr T fmod(T x, T y)
: "u"(y));
} while (fpu_status & 0x400);
return x;
// FIXME: Add a generic implementation of this
// Neither
// ```
// return x - (y * trunc(x/y))
// ```
// nor
// ```
// double result = remainder(std::fabs(x), y = std::fabs(y));
// if (std::signbit(result))
// result += y;
// return std::copysign(result, x);
// ``` from (https://en.cppreference.com/w/cpp/numeric/math/fmod)
// provide enough precision for all cases
// other implementations seem to do this by hand with some fixed point steps in between
// For `remainder` the trivial solution of
// ```
// return x - (y * rint(x/y))
// ```
// might work
#else
# if defined(AK_OS_SERENITY)
// TODO: Add implementation for this function.
TODO();
# endif
if constexpr (IsSame<T, long double>)
return __builtin_fmodl(x, y);
if constexpr (IsSame<T, double>)
return __builtin_fmod(x, y);
if constexpr (IsSame<T, float>)
return __builtin_fmodf(x, y);
#endif
}
@ -420,7 +445,12 @@ constexpr T remainder(T x, T y)
// TODO: Add implementation for this function.
TODO();
# endif
return __builtin_fmod(x, y);
if constexpr (IsSame<T, long double>)
return __builtin_remainderl(x, y);
if constexpr (IsSame<T, double>)
return __builtin_remainder(x, y);
if constexpr (IsSame<T, float>)
return __builtin_remainderf(x, y);
#endif
}
}