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| author | Szabolcs Nagy <nsz@port70.net> | 2014-09-18 17:02:24 +0200 |
|---|---|---|
| committer | Szabolcs Nagy <nsz@port70.net> | 2014-09-18 17:52:50 +0200 |
| commit | 18daae313531ed597d0f6227d15af00b04b104c8 (patch) | |
| tree | 9e4ccc417560cdad1bec3e7933855977139cd8fd /src/math/exp10.c | |
| parent | e2e1bb81485a37321d928a8d8b63f40b9d8fa228 (diff) | |
| download | musl-18daae313531ed597d0f6227d15af00b04b104c8.tar.gz musl-18daae313531ed597d0f6227d15af00b04b104c8.tar.xz musl-18daae313531ed597d0f6227d15af00b04b104c8.zip | |
math: fix exp10 not to raise invalid exception on NaN
This was not caught earlier because gcc incorrectly generates quiet relational operators that never raise exceptions.
Diffstat (limited to 'src/math/exp10.c')
| -rw-r--r-- | src/math/exp10.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/math/exp10.c b/src/math/exp10.c index 16d704a7..9f5e3c2c 100644 --- a/src/math/exp10.c +++ b/src/math/exp10.c @@ -1,5 +1,6 @@ #define _GNU_SOURCE #include <math.h> +#include <stdint.h> #include "libc.h" double exp10(double x) @@ -11,7 +12,9 @@ double exp10(double x) 1e10, 1e11, 1e12, 1e13, 1e14, 1e15 }; double n, y = modf(x, &n); - if (fabs(n) < 16) { + union {double f; uint64_t i;} u = {n}; + /* fabs(n) < 16 without raising invalid on nan */ + if ((u.i>>52 & 0x7ff) < 0x3ff+4) { if (!y) return p10[(int)n+15]; y = exp2(3.32192809488736234787031942948939 * y); return y * p10[(int)n+15]; |