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| author | Joseph Myers <joseph@codesourcery.com> | 2015-08-10 20:35:30 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-08-10 20:35:30 +0000 |
| commit | 7ee06ef15827f8f2582a94b1ceaad47eaf502744 (patch) | |
| tree | a9708093ad2f011a6a92b76e7aab574b72593649 /ChangeLog | |
| parent | eb32b0d40308166c4d8f6330cc2958cb1e545075 (diff) | |
| download | glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.zip glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.tar.gz glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.tar.bz2 | |
Fix ldbl-128ibm tanhl inaccuracy (bug 18790).
ldbl-128ibm tanhl uses a too-small threshold to decide when to return
+/-1, resulting in large errors. This patch changes it to a more
appropriate threshold (the requirement is for 2*exp(-2|x|) to be small
in terms of ulps of 1).
Tested for x86_64, x86 and powerpc.
[BZ #18790]
* sysdeps/ieee754/ldbl-128ibm/s_tanhl.c (__tanhl): Increase
threshold for returning +/- 1.
* math/auto-libm-test-in: Add more tests of tanh.
* math/auto-libm-test-out: Regenerated.
* sysdeps/i386/fpu/libm-test-ulps: Update.
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 9 |
1 files changed, 9 insertions, 0 deletions
@@ -1,3 +1,12 @@ +2015-08-10 Joseph Myers <joseph@codesourcery.com> + + [BZ #18790] + * sysdeps/ieee754/ldbl-128ibm/s_tanhl.c (__tanhl): Increase + threshold for returning +/- 1. + * math/auto-libm-test-in: Add more tests of tanh. + * math/auto-libm-test-out: Regenerated. + * sysdeps/i386/fpu/libm-test-ulps: Update. + 2015-08-10 Andreas Schwab <schwab@suse.de> [BZ #18781] |