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.
23 lines
538 B
C
23 lines
538 B
C
/*
|
|
* wrapper exp2f(x)
|
|
*/
|
|
|
|
#include <float.h>
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
|
|
static const float o_threshold = (float) FLT_MAX_EXP;
|
|
static const float u_threshold = (float) (FLT_MIN_EXP - FLT_MANT_DIG - 1);
|
|
|
|
float
|
|
__exp2f (float x)
|
|
{
|
|
if (__builtin_expect (x <= u_threshold || x > o_threshold, 0)
|
|
&& _LIB_VERSION != _IEEE_ && __finitef (x))
|
|
/* exp2 overflow: 144, exp2 underflow: 145 */
|
|
return __kernel_standard_f (x, x, 144 + (x <= o_threshold));
|
|
|
|
return __ieee754_exp2f (x);
|
|
}
|
|
weak_alias (__exp2f, exp2f)
|