mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
0ac5ae2335
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
/* Copyright (C) 2011 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
|
|
|
|
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.
|
|
|
|
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>
|
|
|
|
|
|
/* wrapper pow */
|
|
double
|
|
__pow (double x, double y)
|
|
{
|
|
double z = __ieee754_pow (x, y);
|
|
if (__builtin_expect (!__finite (z), 0))
|
|
{
|
|
if (_LIB_VERSION != _IEEE_)
|
|
{
|
|
if (__isnan (x))
|
|
{
|
|
if (y == 0.0)
|
|
/* pow(NaN,0.0) */
|
|
return __kernel_standard (x, y, 42);
|
|
}
|
|
else if (__finite (x) && __finite (y))
|
|
{
|
|
if (__isnan (z))
|
|
/* pow neg**non-int */
|
|
return __kernel_standard (x, y, 24);
|
|
else if (x == 0.0 && y < 0.0)
|
|
{
|
|
if (signbit (x) && signbit (z))
|
|
/* pow(-0.0,negative) */
|
|
return __kernel_standard (x, y, 23);
|
|
else
|
|
/* pow(+0.0,negative) */
|
|
return __kernel_standard (x, y, 43);
|
|
}
|
|
else
|
|
/* pow overflow */
|
|
return __kernel_standard (x, y, 21);
|
|
}
|
|
}
|
|
}
|
|
else if (__builtin_expect (z == 0.0, 0) && __finite (x) && __finite (y)
|
|
&& _LIB_VERSION != _IEEE_)
|
|
{
|
|
if (x == 0.0)
|
|
{
|
|
if (y == 0.0)
|
|
/* pow(0.0,0.0) */
|
|
return __kernel_standard (x, y, 20);
|
|
}
|
|
else
|
|
/* pow underflow */
|
|
return __kernel_standard (x, y, 22);
|
|
}
|
|
|
|
return z;
|
|
}
|
|
weak_alias (__pow, pow)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__pow, __powl)
|
|
weak_alias (__pow, powl)
|
|
#endif
|