diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-18 23:27:41 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-18 23:27:41 +0000 |
| commit | 8db3cdefefe39e9d42b05b1610a63190e9f7fba4 (patch) | |
| tree | b4ae0196406ac58ad51d28aacc95b074341c179c /sysdeps/ieee754/dbl-64 | |
| parent | a7a3c24632904b5b1d7e47eaf6b955bba6246b8f (diff) | |
| download | glibc-8db3cdefefe39e9d42b05b1610a63190e9f7fba4.tar.gz glibc-8db3cdefefe39e9d42b05b1610a63190e9f7fba4.tar.xz glibc-8db3cdefefe39e9d42b05b1610a63190e9f7fba4.zip | |
Fix asinh missing underflows (bug 16350).
Similar to various other bugs in this area, some asinh implementations do not raise the underflow exception for subnormal arguments, when the result is tiny and inexact. This patch forces the exception in a similar way to previous fixes. Tested for x86_64, x86 and mips64. [BZ #16350] * sysdeps/i386/fpu/s_asinh.S (__asinh): Force underflow exception for arguments with small absolute value. * sysdeps/i386/fpu/s_asinhf.S (__asinhf): Likewise. * sysdeps/i386/fpu/s_asinhl.S (__asinhl): Likewise. * sysdeps/ieee754/dbl-64/s_asinh.c: Include <float.h>. (__asinh): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/flt-32/s_asinhf.c: Include <float.h>. (__asinhf): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128/s_asinhl.c: Include <float.h>. (__asinhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128ibm/s_asinhl.c: Include <float.h>. (__asinhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-96/s_asinhl.c: Include <float.h>. (__asinhl): Force underflow exception for arguments with small absolute value. * math/auto-libm-test-in: Do not mark underflow exceptions as possibly missing for bug 16350. * math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'sysdeps/ieee754/dbl-64')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_asinh.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_asinh.c b/sysdeps/ieee754/dbl-64/s_asinh.c index a33758d3c9..ebe471015b 100644 --- a/sysdeps/ieee754/dbl-64/s_asinh.c +++ b/sysdeps/ieee754/dbl-64/s_asinh.c @@ -21,6 +21,7 @@ * := sign(x)*log1p(|x| + x^2/(1 + sqrt(1+x^2))) */ +#include <float.h> #include <math.h> #include <math_private.h> @@ -38,6 +39,11 @@ __asinh (double x) ix = hx & 0x7fffffff; if (__glibc_unlikely (ix < 0x3e300000)) /* |x|<2**-28 */ { + if (fabs (x) < DBL_MIN) + { + double force_underflow = x * x; + math_force_eval (force_underflow); + } if (huge + x > one) return x; /* return x inexact except 0 */ } |