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77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* Single-precision math error handling.
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Copyright (C) 2017-2018 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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<http://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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/* NOINLINE prevents fenv semantics breaking optimizations. */
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NOINLINE static float
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xflowf (unsigned long 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 (unsigned long 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 (unsigned long 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 (unsigned long 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 (unsigned long 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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