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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 /sysdeps/i386 | |
| parent | eb32b0d40308166c4d8f6330cc2958cb1e545075 (diff) | |
| download | glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.tar glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.tar.gz glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.tar.bz2 glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.zip | |
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 'sysdeps/i386')
| -rw-r--r-- | sysdeps/i386/fpu/libm-test-ulps | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/sysdeps/i386/fpu/libm-test-ulps b/sysdeps/i386/fpu/libm-test-ulps index eddb3dc990..dbc8f2f331 100644 --- a/sysdeps/i386/fpu/libm-test-ulps +++ b/sysdeps/i386/fpu/libm-test-ulps @@ -1924,7 +1924,7 @@ double: 1 float: 1 idouble: 1 ifloat: 1 -ildouble: 5 +ildouble: 7 ldouble: 4 Function: "tanh_towardzero": |