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| author | Joseph Myers <joseph@codesourcery.com> | 2015-05-15 17:47:29 +0000 |
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| committer | Joseph Myers <joseph@codesourcery.com> | 2015-05-15 17:47:29 +0000 |
| commit | 5a608ccc2d676aa124f6b55a7b20d071e408ca31 (patch) | |
| tree | 41c40103e1b049d25bc519ca0688f48d82d61656 /dirent | |
| parent | ff069f024ae8cf15d53429e034d67ddcece0f67a (diff) | |
| download | glibc-5a608ccc2d676aa124f6b55a7b20d071e408ca31.tar.gz glibc-5a608ccc2d676aa124f6b55a7b20d071e408ca31.tar.xz glibc-5a608ccc2d676aa124f6b55a7b20d071e408ca31.zip | |
Fix tanf spurious underflows (bug 18221).
The flt-32 implementation of tanf produces spurious underflow exceptions for some small arguments, through computing values on the order of x^5. This patch fixes this by adjusting the threshold for returning x (or, as applicable, +/- 1/x) to 2**-13 (the next term in the power series being x^3/3). Tested for x86_64 and x86. [BZ #18221] * sysdeps/ieee754/flt-32/k_tanf.c (__kernel_tanf): Use 2**-13 not 2**-28 as threshold for returning x or +/- 1/x. * math/auto-libm-test-in: Add more tests of tan. * math/auto-libm-test-out: Regenerated.
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