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| author | Joseph Myers <joseph@codesourcery.com> | 2015-08-05 15:01:58 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-08-05 15:01:58 +0000 |
| commit | cf36e5034fa8ed5d44036bce09a55a7f00d19252 (patch) | |
| tree | 9fca061d81056a70793ebee9bf828b4e5b97f724 /ChangeLog | |
| parent | 2aa6c8af26e65695e9daf382a6e508574a30cdf2 (diff) | |
| download | glibc-cf36e5034fa8ed5d44036bce09a55a7f00d19252.tar.gz glibc-cf36e5034fa8ed5d44036bce09a55a7f00d19252.tar.xz glibc-cf36e5034fa8ed5d44036bce09a55a7f00d19252.zip | |
Fix powf (close to -1, large) (bug 18647).
The flt-32 implementation of powf wrongly uses x-1 instead of |x|-1 when computing log (x) for the case where |x| is close to 1 and y is large. This patch fixes the logic accordingly. Relevant tests existed for x close to 1, and corresponding tests are added for x close to -1, as well as for some new variant cases. Tested for x86_64 and x86. [BZ #18647] * sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): For large y and |x| close to 1, use absolute value of x when computing log. * math/auto-libm-test-in: Add more tests of pow. * math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index fd0fd74e39..8d7a8b4f61 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,11 @@ +2015-08-05 Joseph Myers <joseph@codesourcery.com> + + [BZ #18647] + * sysdeps/ieee754/flt-32/e_powf.c (__ieee754_powf): For large y + and |x| close to 1, use absolute value of x when computing log. + * math/auto-libm-test-in: Add more tests of pow. + * math/auto-libm-test-out: Regenerated. + 2015-08-05 Adhemerval Zanella <adhemerval.zanella@linaro.org> * sysdeps/unix/sysv/linux/arm/mmap.c: Add file. |