diff options
Diffstat (limited to 'sysdeps/m68k/fpu/e_pow.c')
| -rw-r--r-- | sysdeps/m68k/fpu/e_pow.c | 137 |
1 files changed, 135 insertions, 2 deletions
diff --git a/sysdeps/m68k/fpu/e_pow.c b/sysdeps/m68k/fpu/e_pow.c index 29798a15ca..970e8b821b 100644 --- a/sysdeps/m68k/fpu/e_pow.c +++ b/sysdeps/m68k/fpu/e_pow.c @@ -1,2 +1,135 @@ -#define FUNC __ieee754_pow -#include <e_fmod.c> +/* Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#define __LIBC_M81_MATH_INLINES +#include <math.h> +#include "math_private.h" + +#ifndef SUFF +#define SUFF +#endif +#ifndef float_type +#define float_type double +#endif + +#define __CONCATX(a,b) __CONCAT(a,b) + +float_type +__CONCATX(__ieee754_pow,SUFF) (float_type x, float_type y) +{ + float_type z; + float_type ax; + + if (y == 0.0) + return 1.0; + if (x != x || y != y) + return x + y; + + if (__m81_u(__CONCATX(__isinf,SUFF)) (y)) + { + ax = __CONCATX(fabs,SUFF) (x); + if (ax == 1) + return y - y; + if (ax > 1) + return y > 0 ? y : 0; + else + return y < 0 ? -y : 0; + } + + if (__CONCATX(fabs,SUFF) (y) == 1) + return y > 0 ? x : 1 / x; + + if (y == 2) + return x * x; + if (y == 0 && x >= 0) + return __m81_u(__CONCATX(__ieee754_sqrt,SUFF)) (x); + + if (x == 10.0) + { + __asm ("ftentox%.x %1, %0" : "=f" (z) : "f" (y)); + return z; + } + if (x == 2.0) + { + __asm ("ftwotox%.x %1, %0" : "=f" (z) : "f" (y)); + return z; + } + + ax = __CONCATX(fabs,SUFF) (x); + if (__m81_u(__CONCATX(__isinf,SUFF)) (x) || x == 0 || ax == 1) + { + z = ax; + if (y < 0) + z = 1 / z; + if (signbit (x)) + { + float_type temp = __m81_u (__CONCATX(__rint,SUFF)) (y); + if (y != temp) + { + if (x == -1) + z = (z - z) / (z - z); + } + else + { + if (sizeof (float_type) == sizeof (float)) + { + long i = (long) y; + if (i & 1) + z = -z; + } + else + { + long long i = (long long) y; + if ((float_type) i == y && i & 1) + z = -z; + } + } + } + return z; + } + + if (x < 0.0) + { + float_type temp = __m81_u (__CONCATX(__rint,SUFF)) (y); + if (y == temp) + { + long long i = (long long) y; + z = (__m81_u(__CONCATX(__ieee754_exp,SUFF)) + (y * __m81_u(__CONCATX(__ieee754_log,SUFF)) (-x))); + if (sizeof (float_type) == sizeof (float)) + { + long i = (long) y; + if (i & 1) + z = -z; + } + else + { + /* If the conversion to long long was inexact assume that y + is an even integer. */ + if ((float_type) i == y && i & 1) + z = -z; + } + } + else + z = (x - x) / (x - x); + } + else + z = (__m81_u(__CONCATX(__ieee754_exp,SUFF)) + (y * __m81_u(__CONCATX(__ieee754_log,SUFF)) (x))); + return z; +} |