diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-21 17:48:04 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-21 17:48:04 +0000 |
| commit | 7540cfc5a8c39eca9ba7b631dd30b35f6530f54d (patch) | |
| tree | c24b888cf113ef3ec9a6e55ad495a1917c6e57bb /ChangeLog | |
| parent | d6cc0b4feaacf7514167cde0b3935f0c9b2c2d88 (diff) | |
| download | glibc-7540cfc5a8c39eca9ba7b631dd30b35f6530f54d.tar.gz | |
Fix x86 / x86_64 expl, exp10l missing underflows (bug 16361).
Similar to various other bugs in this area, the x86 and x86_64
implementations of expl / exp10l can fail to produce underflow
exceptions when the unscaled result has trailing 0 bits so the scaling
down to subnormal precision is exact. This patch fixes this by
forcing the exception in the case of tiny results.
Tested for x86_64 and x86.
[BZ #16361]
* sysdeps/i386/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object.
[!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for
tiny results.
* sysdeps/x86_64/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object.
[!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for
tiny results.
* math/auto-libm-test-in: Add more tests of exp and exp10. Do not
mark underflow exceptions as possibly missing for bug 16361.
* math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 13 |
1 files changed, 13 insertions, 0 deletions
@@ -1,3 +1,16 @@ +2015-06-21 Joseph Myers <joseph@codesourcery.com> + + [BZ #16361] + * sysdeps/i386/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object. + [!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for + tiny results. + * sysdeps/x86_64/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object. + [!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for + tiny results. + * math/auto-libm-test-in: Add more tests of exp and exp10. Do not + mark underflow exceptions as possibly missing for bug 16361. + * math/auto-libm-test-out: Regenerated. + 2015-06-19 Joseph Myers <joseph@codesourcery.com> * conform/data/sys/select.h-data [XOPEN2K8] (pselect): Expect. |