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5c6877b02b
The feenableexcept() and fedisableexcept() APIs are now provided which let you detect when NaNs appear the moment it happens from anywhere in your program. Tests have also been added for the mission critical math functions expf() and erff(), whose perfect operation has been assured. See examples/trapping.c to see how to use this powerful functionality.
105 lines
4 KiB
C
105 lines
4 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╚──────────────────────────────────────────────────────────────────────────────╝
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│ │
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│ Optimized Routines │
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│ Copyright (c) 2018-2024, Arm Limited. │
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│ │
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│ Permission is hereby granted, free of charge, to any person obtaining │
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│ a copy of this software and associated documentation files (the │
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│ "Software"), to deal in the Software without restriction, including │
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│ without limitation the rights to use, copy, modify, merge, publish, │
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│ distribute, sublicense, and/or sell copies of the Software, and to │
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│ permit persons to whom the Software is furnished to do so, subject to │
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│ the following conditions: │
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│ │
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│ The above copyright notice and this permission notice shall be │
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│ included in all copies or substantial portions of the Software. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, │
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│ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF │
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│ MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. │
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│ IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY │
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│ CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, │
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│ TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE │
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│ SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/errno.h"
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#include "libc/cosmo.h"
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#include "libc/tinymath/arm.internal.h"
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#if WANT_ERRNO
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/* dontinline reduces code size and avoids making math functions non-leaf
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when the error handling is inlined. */
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dontinline 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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/* dontinline reduces code size. */
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dontinline static float
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xflowf (uint32_t sign, float y)
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{
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unleaf();
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y = eval_as_float (opt_barrier_float (sign ? -y : y) * y);
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return with_errnof (y, ERANGE);
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}
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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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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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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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float
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__math_divzerof (uint32_t sign)
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{
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unleaf();
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float y = opt_barrier_float (sign ? -1.0f : 1.0f) / 0.0f;
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return with_errnof (y, ERANGE);
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}
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dontinstrument float
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__math_invalidf (float x)
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{
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unleaf();
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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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/* Check result and set errno if necessary. */
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dontinstrument float
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__math_check_uflowf (float y)
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{
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return y == 0.0f ? with_errnof (y, ERANGE) : y;
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}
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dontinstrument float
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__math_check_oflowf (float y)
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{
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return isinf (y) ? with_errnof (y, ERANGE) : y;
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}
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