diff options
| 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/exp10l.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/exp10l.c')
| -rw-r--r-- | src/math/exp10l.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/math/exp10l.c b/src/math/exp10l.c index 4f9469ae..b758ebff 100644 --- a/src/math/exp10l.c +++ b/src/math/exp10l.c @@ -2,13 +2,14 @@ #include <float.h> #include <math.h> #include "libc.h" +#include "libm.h" #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 long double exp10l(long double x) { return exp10(x); } -#else +#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384 long double exp10l(long double x) { static const long double p10[] = { @@ -18,7 +19,9 @@ long double exp10l(long double x) 1e10, 1e11, 1e12, 1e13, 1e14, 1e15 }; long double n, y = modfl(x, &n); - if (fabsl(n) < 16) { + union ldshape u = {n}; + /* fabsl(n) < 16 without raising invalid on nan */ + if ((u.i.se & 0x7fff) < 0x3fff+4) { if (!y) return p10[(int)n+15]; y = exp2l(3.32192809488736234787031942948939L * y); return y * p10[(int)n+15]; |