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| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-29 17:51:32 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-29 17:51:32 +0000 |
| commit | 4aa10d01b654b7395c6e856b8e1e0959cfc80739 (patch) | |
| tree | 01a52e164acecacf0e5b0e1851740d5defcd9d34 /ChangeLog | |
| parent | 63dbe5f32238858c7b953b867ed0588c7808dd4f (diff) | |
| download | glibc-4aa10d01b654b7395c6e856b8e1e0959cfc80739.zip glibc-4aa10d01b654b7395c6e856b8e1e0959cfc80739.tar.gz glibc-4aa10d01b654b7395c6e856b8e1e0959cfc80739.tar.bz2 | |
Fix ldbl-128 j1l spurious underflows (bug 18612).
The ldbl-128 implementation of j1l produces spurious underflow
exceptions for some small arguments, as a result of squaring the
argument. This patch fixes it just to use a linear approximation for
sufficiently small arguments, and then to force an underflow exception
only in the cases where it is required.
Tested for mips64.
[BZ #18612]
* sysdeps/ieee754/ldbl-128/e_j1l.c (__ieee754_j1l): For small
arguments, just return 0.5 times the argument, with underflow
forced as needed.
* math/auto-libm-test-in: Add more tests of j1.
* math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 7 |
1 files changed, 7 insertions, 0 deletions
@@ -1,5 +1,12 @@ 2015-06-29 Joseph Myers <joseph@codesourcery.com> + [BZ #18612] + * sysdeps/ieee754/ldbl-128/e_j1l.c (__ieee754_j1l): For small + arguments, just return 0.5 times the argument, with underflow + forced as needed. + * math/auto-libm-test-in: Add more tests of j1. + * math/auto-libm-test-out: Regenerated. + [BZ #16559] * sysdeps/ieee754/dbl-64/e_j1.c: Include <float.h>. (__ieee754_j1): Force underflow exception for small results. |