diff options
Diffstat (limited to 'math/w_powl.c')
| -rw-r--r-- | math/w_powl.c | 115 |
1 files changed, 61 insertions, 54 deletions
diff --git a/math/w_powl.c b/math/w_powl.c index 0bb09518d5..1ad581ad94 100644 --- a/math/w_powl.c +++ b/math/w_powl.c @@ -1,68 +1,75 @@ -/* w_powl.c -- long double version of w_pow.c. - * Conversion to long double by Ulrich Drepper, - * Cygnus Support, drepper@cygnus.com. - */ +/* Copyright (C) 2011 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. -/* - * wrapper powl(x,y) return x**y - */ + 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ #include <math.h> #include <math_private.h> -#ifdef __STDC__ - long double __powl(long double x, long double y)/* wrapper powl */ -#else - long double __powl(x,y) /* wrapper powl */ - long double x,y; -#endif +/* wrapper powl */ +long double +__powl (long double x, long double y) { -#ifdef _IEEE_LIBM - return __ieee754_powl(x,y); -#else - long double z; - z=__ieee754_powl(x,y); - if(_LIB_VERSION == _IEEE_|| __isnanl(y)) return z; - if(__isnanl(x)) { - if(y==0.0) - return __kernel_standard(x,y,242); /* pow(NaN,0.0) */ - else - return z; - } - if(x==0.0) { - if(y==0.0) - return __kernel_standard(x,y,220); /* pow(0.0,0.0) */ - if(__finitel(y)&&y<0.0) { - if (signbit (x) && signbit (z)) - return __kernel_standard(x,y,223); /* pow(-0.0,negative) */ + long double z = __ieee754_powl (x, y); + if (__builtin_expect (!__finitel (z), 0)) + { + if (_LIB_VERSION != _IEEE_) + { + if (__isnanl (x)) + { + if (y == 0.0L) + /* pow(NaN,0.0) */ + return __kernel_standard (x, y, 242); + } + else if (__finitel (x) && __finitel (y)) + { + if (__isnanl (z)) + /* pow neg**non-int */ + return __kernel_standard (x, y, 224); + else if (x == 0.0L && y < 0.0L) + { + if (signbit (x) && signbit (z)) + /* pow(-0.0,negative) */ + return __kernel_standard (x, y, 223); + else + /* pow(+0.0,negative) */ + return __kernel_standard (x, y, 243); + } else - return __kernel_standard(x,y,243); /* pow(+0.0,negative) */ + /* pow overflow */ + return __kernel_standard (x, y, 221); } - return z; } - if(!__finitel(z)) { - if(__finitel(x)&&__finitel(y)) { - if(__isnanl(z)) - return __kernel_standard(x,y,224); /* pow neg**non-int */ - else - return __kernel_standard(x,y,221); /* pow overflow */ - } + } + else if (__builtin_expect (z == 0.0L, 0) && __finitel (x) && __finitel (y) + && _LIB_VERSION != _IEEE_) + { + if (x == 0.0L) + { + if (y == 0.0L) + /* pow(0.0,0.0) */ + return __kernel_standard (x, y, 220); } - if(z==0.0&&__finitel(x)&&__finitel(y)) - return __kernel_standard(x,y,222); /* pow underflow */ - return z; -#endif + else + /* pow underflow */ + return __kernel_standard (x, y, 222); + } + + return z; } weak_alias (__powl, powl) |