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| author | Szabolcs Nagy <nsz@port70.net> | 2012-11-13 00:45:51 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <nsz@port70.net> | 2012-11-13 00:45:51 +0100 |
| commit | 52bcf3f5fb3251dca4df5b97b01543160340b31b (patch) | |
| tree | e74784aa10dc7a82f9b625462142be80fc4905b6 /src/math/logb.c | |
| parent | 37aa7f7301d6526c14635375886acd881b471f6c (diff) | |
| download | musl-52bcf3f5fb3251dca4df5b97b01543160340b31b.tar.gz musl-52bcf3f5fb3251dca4df5b97b01543160340b31b.tar.bz2 musl-52bcf3f5fb3251dca4df5b97b01543160340b31b.tar.xz musl-52bcf3f5fb3251dca4df5b97b01543160340b31b.zip | |
math: fix logb*.c exceptions now that ilogb raises invalid
Diffstat (limited to 'src/math/logb.c')
| -rw-r--r-- | src/math/logb.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/src/math/logb.c b/src/math/logb.c index f7cd7613..624425a8 100644 --- a/src/math/logb.c +++ b/src/math/logb.c @@ -1,20 +1,17 @@ -#include <limits.h> #include "libm.h" /* special cases: - logb(+-0) = -inf + logb(+-0) = -inf, and raise divbyzero logb(+-inf) = +inf logb(nan) = nan -these are calculated at runtime to raise fp exceptions */ -double logb(double x) { - int i = ilogb(x); - - if (i == FP_ILOGB0) - return -1.0/fabs(x); - if (i == FP_ILOGBNAN || i == INT_MAX) +double logb(double x) +{ + if (!isfinite(x)) return x * x; - return i; + if (x == 0) + return -1/(x+0); + return ilogb(x); } |