0ac5ae2335
libm is now somewhat integrated with gcc's -ffinite-math-only option and lots of the wrapper functions have been optimized.
60 lines
1.6 KiB
C
60 lines
1.6 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 <fenv.h>
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
|
|
|
|
static float
|
|
__attribute__ ((noinline))
|
|
invalid_fn (float x, float fn)
|
|
{
|
|
if (__rintf (fn) != fn)
|
|
{
|
|
feraiseexcept (FE_INVALID);
|
|
return __nan ("");
|
|
}
|
|
else if (fn > 65000.0f)
|
|
return __scalbnf (x, 65000);
|
|
else
|
|
return __scalbnf (x,-65000);
|
|
}
|
|
|
|
|
|
float
|
|
__ieee754_scalbf (float x, float fn)
|
|
{
|
|
if (__builtin_expect (__isnanf (x), 0))
|
|
return x * fn;
|
|
if (__builtin_expect (!__finitef (fn), 0))
|
|
{
|
|
if (__isnanf (fn) || fn > 0.0f)
|
|
return x * fn;
|
|
if (x == 0.0f)
|
|
return x;
|
|
return x / -fn;
|
|
}
|
|
if (__builtin_expect ((float) (int) fn != fn, 0))
|
|
return invalid_fn (x, fn);
|
|
|
|
return __scalbnf (x, (int) fn);
|
|
}
|
|
strong_alias (__ieee754_scalbf, __scalbf_finite)
|