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| author | Joseph Myers <joseph@codesourcery.com> | 2012-03-21 12:17:26 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2012-03-21 12:17:26 +0000 |
| commit | 0cb7efc517a293417880f02e2991483b7ce1e3f9 (patch) | |
| tree | 6c0c2e224abce394aa9713bf8de43d4ff8012bdb /math/w_exp2.c | |
| parent | 2460d3aa21f04cdf28497683bd3e29183189f779 (diff) | |
| download | glibc-0cb7efc517a293417880f02e2991483b7ce1e3f9.tar.gz glibc-0cb7efc517a293417880f02e2991483b7ce1e3f9.tar.xz glibc-0cb7efc517a293417880f02e2991483b7ce1e3f9.zip | |
Fix missing exp2 overflow exception (bug 13871).
Diffstat (limited to 'math/w_exp2.c')
| -rw-r--r-- | math/w_exp2.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/math/w_exp2.c b/math/w_exp2.c index 7a3b0afb74..b5d8e25702 100644 --- a/math/w_exp2.c +++ b/math/w_exp2.c @@ -2,23 +2,19 @@ * wrapper exp2(x) */ -#include <float.h> #include <math.h> #include <math_private.h> -static const double o_threshold = (double) DBL_MAX_EXP; -static const double u_threshold = (double) (DBL_MIN_EXP - DBL_MANT_DIG - 1); - double __exp2 (double x) { - if (__builtin_expect (islessequal (x, u_threshold) - || isgreater (x, o_threshold), 0) - && _LIB_VERSION != _IEEE_ && __finite (x)) + double z = __ieee754_exp2 (x); + if (__builtin_expect (!__finite (z), 0) + && __finite (x) && _LIB_VERSION != _IEEE_) /* exp2 overflow: 44, exp2 underflow: 45 */ - return __kernel_standard (x, x, 44 + (x <= o_threshold)); + return __kernel_standard (x, x, 44 + !!__signbit (x)); - return __ieee754_exp2 (x); + return z; } weak_alias (__exp2, exp2) #ifdef NO_LONG_DOUBLE |