diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2015-06-21 18:43:10 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-06-21 18:43:10 +0000 |
| commit | cb0937b299182e78307795081489ec1f148bdbd7 (patch) | |
| tree | 32137f8b8dde65185697602763252a45e40e8472 /NEWS | |
| parent | fea1d8d67363c8b675a4c2533769ae12dc86efff (diff) | |
| download | glibc-cb0937b299182e78307795081489ec1f148bdbd7.tar.gz glibc-cb0937b299182e78307795081489ec1f148bdbd7.tar.xz glibc-cb0937b299182e78307795081489ec1f148bdbd7.zip | |
Fix x86_64 / x86 expm1l (-min_subnorm) result sign (bug 18569).
In the x86 / x86_64 implementations of expm1l, when expm1l's result should underflow to 0 (argument minus the least subnormal, in some rounding modes), it can be a zero of the wrong sign. This patch fixes this by returning the argument with underflow forced in that case (this is a 1ulp error relative to the correctly rounded result of -0, which is OK in terms of the documented accuracy goals, whereas a result with the wrong sign never is). Tested for x86_64 and x86. [BZ #18569] * sysdeps/i386/fpu/e_expl.S (IEEE754_EXPL) [USE_AS_EXPM1L]: Force underflow and return argument in case of subnormal argument. * sysdeps/x86_64/fpu/e_expl.S (IEEE754_EXPL) [USE_AS_EXPM1L]: Likewise. * math/auto-libm-test-in: Add more tests of expm1. * math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/NEWS b/NEWS index e4a17c3b7e..90495e8e87 100644 --- a/NEWS +++ b/NEWS @@ -23,7 +23,7 @@ Version 2.22 18422, 18434, 18444, 18468, 18469, 18470, 18479, 18483, 18495, 18496, 18497, 18498, 18507, 18512, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532, 18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, - 18546, 18547, 18553, 18558. + 18546, 18547, 18553, 18558, 18569. * Cache information can be queried via sysconf() function on s390 e.g. with _SC_LEVEL1_ICACHE_SIZE as argument. |