mirror of git://sourceware.org/git/glibc.git
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* Return X^Y, with special cases based on exp(Y*log(X)).
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Copyright (C) 2025 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 <errno.h>
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#include <math.h>
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#include <math_private.h>
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FLOAT
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M_DECL_FUNC (__powr) (FLOAT x, FLOAT y)
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{
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if (isless (x, M_LIT (0.0))
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|| (x == M_LIT (0.0) && y == M_LIT (0.0))
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|| (x == M_LIT (1.0) && isinf (y))
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|| (isinf (x) && y == M_LIT (0.0)))
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{
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__set_errno (EDOM);
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return (x - x) / (x - x);
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}
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if (isnan (x) || isnan (y))
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return x + y;
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x = M_FABS (x);
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FLOAT ret = M_SUF (__ieee754_pow) (x, y);
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if (!isfinite (ret))
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{
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if (isfinite (x) && isfinite (y))
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__set_errno (ERANGE);
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}
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else if (ret == 0
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&& isfinite (x)
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&& x != 0
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&& isfinite (y))
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__set_errno (ERANGE);
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return ret;
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}
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declare_mgen_alias (__powr, powr);
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