136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/* Copyright (C) 1997 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#define __LIBC_M81_MATH_INLINES
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#include <math.h>
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#include "math_private.h"
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#ifndef SUFF
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#define SUFF
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#endif
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#ifndef float_type
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#define float_type double
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#endif
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#define __CONCATX(a,b) __CONCAT(a,b)
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float_type
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__CONCATX(__ieee754_pow,SUFF) (float_type x, float_type y)
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{
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float_type z;
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float_type ax;
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if (y == 0.0)
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return 1.0;
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if (x != x || y != y)
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return x + y;
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if (__m81_u(__CONCATX(__isinf,SUFF)) (y))
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{
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ax = __CONCATX(fabs,SUFF) (x);
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if (ax == 1)
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return y - y;
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if (ax > 1)
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return y > 0 ? y : 0;
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else
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return y < 0 ? -y : 0;
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}
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if (__CONCATX(fabs,SUFF) (y) == 1)
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return y > 0 ? x : 1 / x;
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if (y == 2)
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return x * x;
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if (y == 0 && x >= 0)
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return __m81_u(__CONCATX(__ieee754_sqrt,SUFF)) (x);
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if (x == 10.0)
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{
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__asm ("ftentox%.x %1, %0" : "=f" (z) : "f" (y));
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return z;
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}
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if (x == 2.0)
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{
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__asm ("ftwotox%.x %1, %0" : "=f" (z) : "f" (y));
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return z;
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}
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ax = __CONCATX(fabs,SUFF) (x);
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if (__m81_u(__CONCATX(__isinf,SUFF)) (x) || x == 0 || ax == 1)
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{
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z = ax;
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if (y < 0)
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z = 1 / z;
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if (signbit (x))
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{
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float_type temp = __m81_u (__CONCATX(__rint,SUFF)) (y);
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if (y != temp)
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{
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if (x == -1)
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z = (z - z) / (z - z);
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}
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else
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{
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if (sizeof (float_type) == sizeof (float))
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{
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long i = (long) y;
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if (i & 1)
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z = -z;
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}
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else
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{
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long long i = (long long) y;
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if ((float_type) i == y && i & 1)
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z = -z;
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}
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}
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}
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return z;
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}
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if (x < 0.0)
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{
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float_type temp = __m81_u (__CONCATX(__rint,SUFF)) (y);
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if (y == temp)
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{
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long long i = (long long) y;
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z = (__m81_u(__CONCATX(__ieee754_exp,SUFF))
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(y * __m81_u(__CONCATX(__ieee754_log,SUFF)) (-x)));
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if (sizeof (float_type) == sizeof (float))
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{
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long i = (long) y;
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if (i & 1)
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z = -z;
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}
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else
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{
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/* If the conversion to long long was inexact assume that y
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is an even integer. */
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if ((float_type) i == y && i & 1)
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z = -z;
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}
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}
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else
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z = (x - x) / (x - x);
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}
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else
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z = (__m81_u(__CONCATX(__ieee754_exp,SUFF))
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(y * __m81_u(__CONCATX(__ieee754_log,SUFF)) (x)));
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return z;
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}
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