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16439f419b
The error handling is moved to sysdeps/ieee754 version with no SVID support. The compatibility symbol versions still use the wrapper with SVID error handling around the new code. There is no new symbol version nor compatibility code on !LIBM_SVID_COMPAT targets (e.g. riscv). The ia64 is unchanged, since it still uses the arch specific __libm_error_region on its implementation. For both i686 and m68k, which provive arch specific implementation, wrappers are added so no new symbol are added (which would require to change the implementations). It shows an small improvement, the results for fmod: Architecture | Input | master | patch -----------------|-----------------|----------|-------- x86_64 (Ryzen 9) | subnormals | 12.5049 | 9.40992 x86_64 (Ryzen 9) | normal | 296.939 | 296.738 x86_64 (Ryzen 9) | close-exponents | 16.0244 | 13.119 aarch64 (N1) | subnormal | 6.81778 | 4.33313 aarch64 (N1) | normal | 155.620 | 152.915 aarch64 (N1) | close-exponents | 8.21306 | 5.76138 armhf (N1) | subnormal | 15.1083 | 14.5746 armhf (N1) | normal | 244.833 | 241.738 armhf (N1) | close-exponents | 21.8182 | 22.457 Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/* Single-precision math error handling.
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Copyright (C) 2017-2023 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 "math_config.h"
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#if WANT_ERRNO
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# include <errno.h>
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/* NOINLINE reduces code size. */
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NOINLINE static float
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with_errnof (float y, int e)
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{
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errno = e;
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return y;
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}
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#else
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# define with_errnof(x, e) (x)
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#endif
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attribute_hidden float
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__math_edomf (float y)
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{
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return with_errnof (y, EDOM);
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}
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/* NOINLINE prevents fenv semantics breaking optimizations. */
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NOINLINE static float
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xflowf (uint32_t sign, float y)
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{
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y = (sign ? -y : y) * y;
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return with_errnof (y, ERANGE);
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}
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attribute_hidden float
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__math_uflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1p-95f);
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}
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#if WANT_ERRNO_UFLOW
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/* Underflows to zero in some non-nearest rounding mode, setting errno
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is valid even if the result is non-zero, but in the subnormal range. */
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attribute_hidden float
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__math_may_uflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1.4p-75f);
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}
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#endif
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attribute_hidden float
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__math_oflowf (uint32_t sign)
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{
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return xflowf (sign, 0x1p97f);
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}
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attribute_hidden float
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__math_divzerof (uint32_t sign)
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{
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float y = 0;
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return with_errnof ((sign ? -1 : 1) / y, ERANGE);
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}
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attribute_hidden float
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__math_invalidf (float x)
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{
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float y = (x - x) / (x - x);
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return isnan (x) ? y : with_errnof (y, EDOM);
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}
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