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| author | Joseph Myers <joseph@codesourcery.com> | 2015-02-27 17:48:37 +0000 |
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| committer | Joseph Myers <joseph@codesourcery.com> | 2015-02-27 17:48:37 +0000 |
| commit | 2ca725c594e0c186d928dc0823be7d8b5976112c (patch) | |
| tree | 8f477bda16d5f94bb925301798e653d3064ee75d /ChangeLog.old-ports | |
| parent | af96be34825586536ebcfbf5c675e795ddd3c8fa (diff) | |
| download | glibc-2ca725c594e0c186d928dc0823be7d8b5976112c.tar.gz glibc-2ca725c594e0c186d928dc0823be7d8b5976112c.tar.xz glibc-2ca725c594e0c186d928dc0823be7d8b5976112c.zip | |
Fix ldbl-96, ldbl-128ibm atanhl inaccuracy (bug 18046, bug 18047).
The threshold in ldbl-96 atanhl for when to return the argument, 0x1p-28, is a bit too big, and that in ldbl-128ibm atanhl is much too big (the relevant condition being x^3/3 being < 0.5ulp of x), resulting in errors a bit above the limits of those considered acceptable in glibc in the ldbl-96 case, and in large errors in the ldbl-128ibm case. This patch changes those implementations to use more appropriate thresholds and adds tests around the thresholds for various formats. Tested for x86_64, x86 and powerpc. x86_64 and x86 ulps updated accordingly. [BZ #18046] [BZ #18047] * sysdeps/ieee754/ldbl-128ibm/e_atanhl.c (__ieee754_atanhl): Use 0x1p-56L as threshold for just returning the argument. * sysdeps/ieee754/ldbl-96/e_atanhl.c (__ieee754_atanhl): Use 0x1p-32L as threshold for just returning the argument. * math/auto-libm-test-in: Add more tests of atanh. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulp: Likewise.
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