0928368f62
This adds the Arm Optimized Routines (see https://github.com/ARM-software/optimized-routines) source code under the the LLVM license. The version of the code provided in this patch is v20.02 of the Arm Optimized Routines project. This entire contribution is being committed as is even though it does not currently fit the LLVM libc model and does not follow the LLVM coding style. In the near future, implementations from this patch will be moved over to their right place in the LLVM-libc tree. This will be done over many small patches, all of which will go through the normal LLVM code review process. See this libc-dev post for the plan: http://lists.llvm.org/pipermail/libc-dev/2020-March/000044.html Differential revision of the original upload: https://reviews.llvm.org/D75355
82 lines
1.6 KiB
C
82 lines
1.6 KiB
C
/*
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* Double-precision math error handling.
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*
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* Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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* See https://llvm.org/LICENSE.txt for license information.
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* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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*/
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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 and avoids making math functions non-leaf
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when the error handling is inlined. */
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NOINLINE static double
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with_errno (double 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_errno(x, e) (x)
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#endif
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/* NOINLINE reduces code size. */
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NOINLINE static double
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xflow (uint32_t sign, double y)
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{
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y = eval_as_double (opt_barrier_double (sign ? -y : y) * y);
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return with_errno (y, ERANGE);
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}
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HIDDEN double
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__math_uflow (uint32_t sign)
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{
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return xflow (sign, 0x1p-767);
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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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HIDDEN double
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__math_may_uflow (uint32_t sign)
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{
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return xflow (sign, 0x1.8p-538);
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}
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#endif
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HIDDEN double
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__math_oflow (uint32_t sign)
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{
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return xflow (sign, 0x1p769);
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}
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HIDDEN double
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__math_divzero (uint32_t sign)
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{
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double y = opt_barrier_double (sign ? -1.0 : 1.0) / 0.0;
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return with_errno (y, ERANGE);
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}
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HIDDEN double
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__math_invalid (double x)
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{
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double y = (x - x) / (x - x);
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return isnan (x) ? y : with_errno (y, EDOM);
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}
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/* Check result and set errno if necessary. */
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HIDDEN double
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__math_check_uflow (double y)
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{
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return y == 0.0 ? with_errno (y, ERANGE) : y;
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}
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HIDDEN double
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__math_check_oflow (double y)
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{
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return isinf (y) ? with_errno (y, ERANGE) : y;
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}
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