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| author | Joseph Myers <joseph@codesourcery.com> | 2015-12-09 21:20:18 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-12-09 21:20:18 +0000 |
| commit | ca2fcac629b9b7781ccd52685b28741d89ff128f (patch) | |
| tree | 8c2b6491a4672a338e965e8ca1fa0f8724d189a6 /ChangeLog | |
| parent | e5a5315e2d290fe34e0fb80996c713b8b802dcc9 (diff) | |
| download | glibc-ca2fcac629b9b7781ccd52685b28741d89ff128f.tar.gz glibc-ca2fcac629b9b7781ccd52685b28741d89ff128f.tar.xz glibc-ca2fcac629b9b7781ccd52685b28741d89ff128f.zip | |
Fix ldbl-128ibm tanhl inaccuracy for small arguments (bug 19349).
The ldbl-128ibm implementation of tanhl is inaccurate for small arguments, because it returns x*(1+x) (maybe in an attempt to raise "inexact") when x itself would be the accurate return value but multiplying by 1+x introduces large errors. This patch fixes it to return x in that case (when the mathematical result is x plus a negligible remainder on the order of x^3) to avoid those errors. Tested for powerpc. [BZ #19349] * sysdeps/ieee754/ldbl-128ibm/s_tanhl.c (__tanhl): Return argument when small.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index b2eddff236..b76c54b9a5 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,9 @@ 2015-12-09 Joseph Myers <joseph@codesourcery.com> + [BZ #19349] + * sysdeps/ieee754/ldbl-128ibm/s_tanhl.c (__tanhl): Return argument + when small. + * sysdeps/unix/sysv/linux/i386/kernel-features.h [__LINUX_KERNEL_VERSION >= 0x040300] (__ASSUME_SOCKET_SYSCALL): New macro. |