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1dd2163e51
The optimized i386 version is faster than the generic one, and gcc implements it through the builtin. It allows us to move the implementation to a C one. The performance on a Zen3 chip is slight better: reciprocal-throughput input master no-SVID improvement i686 subnormals 22.4741 20.1571 10.31% i686 normal 74.1631 70.3606 5.13% i686 close-exponent 22.5625 20.2435 10.28% Tested on i686-linux-gnu. Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/* Floating-point remainder function.
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Copyright (C) 2023-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <libm-alias-finite.h>
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#include <libm-alias-float.h>
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#include <math.h>
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#include "sysdeps/ieee754/flt-32/math_config.h"
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float
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__fmodf (float x, float y)
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{
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uint32_t hx = asuint (x);
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uint32_t hy = asuint (y);
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/* fmod(+-Inf,y) or fmod(x,0) */
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if (__glibc_unlikely ((is_inf (hx) || y == 0.0f)
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&& !is_nan (hy)
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&& !is_nan (hx)))
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return __math_invalidf (x);
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return __builtin_fmodf (x, y);
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}
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strong_alias (__fmodf, __ieee754_fmodf)
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versioned_symbol (libm, __fmodf, fmodf, GLIBC_2_43);
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libm_alias_float_other (__fmod, fmod)
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libm_alias_finite (__ieee754_fmodf, __fmodf)
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