61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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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.h>
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#include <math_private.h>
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/* wrapper powf */
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float
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__powf (float x, float y)
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{
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float z = __ieee754_powf (x, y);
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if (__glibc_unlikely (!isfinite (z)))
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{
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if (_LIB_VERSION != _IEEE_)
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{
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if (isfinite (x) && isfinite (y))
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{
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if (isnan (z))
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/* pow neg**non-int */
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return __kernel_standard_f (x, y, 124);
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else if (x == 0.0f && y < 0.0f)
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{
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if (signbit (x) && signbit (z))
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/* pow(-0.0,negative) */
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return __kernel_standard_f (x, y, 123);
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else
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/* pow(+0.0,negative) */
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return __kernel_standard_f (x, y, 143);
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}
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else
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/* pow overflow */
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return __kernel_standard_f (x, y, 121);
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}
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}
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}
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else if (__builtin_expect (z == 0.0f, 0)
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&& isfinite (x) && x != 0 && isfinite (y)
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&& _LIB_VERSION != _IEEE_)
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/* pow underflow */
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return __kernel_standard_f (x, y, 122);
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return z;
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}
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weak_alias (__powf, powf)
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