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| author | Joseph Myers <joseph@codesourcery.com> | 2013-04-26 19:26:22 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2013-04-26 19:26:22 +0000 |
| commit | 9457fd952cafc701375fc9fae575a4aca1374de3 (patch) | |
| tree | 0116832c92205eb0c42197ce9c269a7f52d09c5e /math/s_catanh.c | |
| parent | f0302940e7c2acb587971e3c99dfbd00aa4e2134 (diff) | |
| download | glibc-9457fd952cafc701375fc9fae575a4aca1374de3.tar.gz glibc-9457fd952cafc701375fc9fae575a4aca1374de3.tar.xz glibc-9457fd952cafc701375fc9fae575a4aca1374de3.zip | |
Fix catan, catanh missing underflows (bug 15406).
Diffstat (limited to 'math/s_catanh.c')
| -rw-r--r-- | math/s_catanh.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/math/s_catanh.c b/math/s_catanh.c index 0ee8c64b6f..5d18cd639f 100644 --- a/math/s_catanh.c +++ b/math/s_catanh.c @@ -20,7 +20,7 @@ #include <complex.h> #include <math.h> #include <math_private.h> - +#include <float.h> __complex__ double __catanh (__complex__ double x) @@ -76,6 +76,17 @@ __catanh (__complex__ double x) den = 1 - __real__ x * __real__ x - i2; __imag__ res = 0.5 * __ieee754_atan2 (2.0 * __imag__ x, den); + + if (fabs (__real__ res) < DBL_MIN) + { + volatile double force_underflow = __real__ res * __real__ res; + (void) force_underflow; + } + if (fabs (__imag__ res) < DBL_MIN) + { + volatile double force_underflow = __imag__ res * __imag__ res; + (void) force_underflow; + } } return res; |