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| author | Joseph Myers <joseph@codesourcery.com> | 2015-08-06 23:01:09 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-08-06 23:01:09 +0000 |
| commit | 5e29dd573777197fc4d12c1bdea8f6d04e505391 (patch) | |
| tree | 750cd162b91bfad88eaf7904cf33977a248e3817 /sysdeps/ieee754/dbl-64/e_sinh.c | |
| parent | 2ba30a182ca50ac07f45ed1f813a85ccafaed85d (diff) | |
| download | glibc-5e29dd573777197fc4d12c1bdea8f6d04e505391.tar.gz glibc-5e29dd573777197fc4d12c1bdea8f6d04e505391.tar.xz glibc-5e29dd573777197fc4d12c1bdea8f6d04e505391.zip | |
Fix sinh missing underflows (bug 16519).
Similar to various other bugs in this area, some sinh 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, mips64 and powerpc. [BZ #16519] * sysdeps/ieee754/dbl-64/e_sinh.c: Include <float.h>. (__ieee754_sinh): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/flt-32/e_sinhf.c: Include <float.h>. (__ieee754_sinhf): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128/e_sinhl.c: Include <float.h>. (__ieee754_sinhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-128ibm/e_sinhl.c: Include <float.h>. (__ieee754_sinhl): Force underflow exception for arguments with small absolute value. * sysdeps/ieee754/ldbl-96/e_sinhl.c: Include <float.h>. (__ieee754_sinhl): Force underflow exception for arguments with small absolute value. * math/auto-libm-test-in: Add more tests of sinh. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update.
Diffstat (limited to 'sysdeps/ieee754/dbl-64/e_sinh.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/e_sinh.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_sinh.c b/sysdeps/ieee754/dbl-64/e_sinh.c index 4ff28bf85d..c99d28311d 100644 --- a/sysdeps/ieee754/dbl-64/e_sinh.c +++ b/sysdeps/ieee754/dbl-64/e_sinh.c @@ -32,6 +32,7 @@ static char rcsid[] = "$NetBSD: e_sinh.c,v 1.7 1995/05/10 20:46:13 jtc Exp $"; * only sinh(0)=0 is exact for finite x. */ +#include <float.h> #include <math.h> #include <math_private.h> @@ -58,10 +59,16 @@ __ieee754_sinh (double x) /* |x| in [0,22], return sign(x)*0.5*(E+E/(E+1))) */ if (ix < 0x40360000) /* |x|<22 */ { - if (__glibc_unlikely (ix < 0x3e300000)) /* |x|<2**-28 */ + if (__glibc_unlikely (ix < 0x3e300000)) { /* |x|<2**-28 */ + if (fabs (x) < DBL_MIN) + { + double force_underflow = x * x; + math_force_eval (force_underflow); + } if (shuge + x > one) return x; - /* sinh(tiny) = tiny with inexact */ + /* sinh(tiny) = tiny with inexact */ + } t = __expm1 (fabs (x)); if (ix < 0x3ff00000) return h * (2.0 * t - t * t / (t + one)); |