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author | Joseph Myers <joseph@codesourcery.com> | 2013-12-18 11:38:27 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2013-12-18 11:38:27 +0000 |
commit | 2dec468fd82c6d968f622c2c519fcb8dc09bddac (patch) | |
tree | ebc7e3f72a6474d7aa3f6a042bb01a2917562bc3 /nptl_db/td_thr_get_info.c | |
parent | 4d84e6addd62bdc256627af334ba85489112e008 (diff) | |
download | glibc-2dec468fd82c6d968f622c2c519fcb8dc09bddac.tar.gz glibc-2dec468fd82c6d968f622c2c519fcb8dc09bddac.tar.xz glibc-2dec468fd82c6d968f622c2c519fcb8dc09bddac.zip |
Fix ldbl-128 logl for subnormals (bug 16338).
This patch fixes bug 16338, ldbl-128 logl not handling subnormals (with consequent inaccuracy for lgammal as well). The fix is simply to use __frexpl when determining the exponent, as done already in log2l and log10l. Given the lack of testing of small arguments to any of the log* functions, appropriate tests are added for all of them. Tested x86_64 and x86 and ulps updated accordingly, and spot tests also run for mips64 to confirm the ldbl-128 fix. Note that while this fixes lgammal inaccuracy for small positive arguments, I suspect that there will still be problems with spurious underflows in that case. * sysdeps/ieee754/ldbl-128/e_logl.c (__ieee754_logl): Use __frexpl to determine exponent and adjust argument to have exponent of -1. * math/auto-libm-test-in: Add more tests of log, log10, log1p and log2. * math/auto-libm-test-out: Regenerated. * sysdeps/x86_64/fpu/libm-test-ulps: Update.
Diffstat (limited to 'nptl_db/td_thr_get_info.c')
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