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| author | Joseph Myers <joseph@codesourcery.com> | 2015-08-10 20:35:30 +0000 |
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| committer | Joseph Myers <joseph@codesourcery.com> | 2015-08-10 20:35:30 +0000 |
| commit | 7ee06ef15827f8f2582a94b1ceaad47eaf502744 (patch) | |
| tree | a9708093ad2f011a6a92b76e7aab574b72593649 /ChangeLog.2 | |
| parent | eb32b0d40308166c4d8f6330cc2958cb1e545075 (diff) | |
| download | glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.tar.gz glibc-7ee06ef15827f8f2582a94b1ceaad47eaf502744.tar.xz 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.
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