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authorJoseph Myers <joseph@codesourcery.com>2012-03-21 12:17:26 +0000
committerJoseph Myers <joseph@codesourcery.com>2012-03-21 12:17:26 +0000
commit0cb7efc517a293417880f02e2991483b7ce1e3f9 (patch)
tree6c0c2e224abce394aa9713bf8de43d4ff8012bdb /math/w_exp2f.c
parent2460d3aa21f04cdf28497683bd3e29183189f779 (diff)
downloadglibc-0cb7efc517a293417880f02e2991483b7ce1e3f9.tar.gz
Fix missing exp2 overflow exception (bug 13871).
Diffstat (limited to 'math/w_exp2f.c')
-rw-r--r--math/w_exp2f.c14
1 files changed, 5 insertions, 9 deletions
diff --git a/math/w_exp2f.c b/math/w_exp2f.c
index c4e9e94164..7c277ef390 100644
--- a/math/w_exp2f.c
+++ b/math/w_exp2f.c
@@ -2,22 +2,18 @@
* 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 (islessequal (x, u_threshold)
- || isgreater (x, o_threshold), 0)
- && _LIB_VERSION != _IEEE_ && __finitef (x))
+ float z = __ieee754_exp2f (x);
+ if (__builtin_expect (!__finitef (z), 0)
+ && __finitef (x) && _LIB_VERSION != _IEEE_)
/* exp2 overflow: 144, exp2 underflow: 145 */
- return __kernel_standard_f (x, x, 144 + (x <= o_threshold));
+ return __kernel_standard_f (x, x, 144 + !!__signbitf (x));
- return __ieee754_exp2f (x);
+ return z;
}
weak_alias (__exp2f, exp2f)