| commit | 5a608ccc2d676aa124f6b55a7b20d071e408ca31 | |
| author | Joseph Myers <joseph@codesourcery.com> | |
| Fri, 15 May 2015 17:47:29 +0000 (15 17:47 +0000) | ||
| committer | Joseph Myers <joseph@codesourcery.com> | |
| Fri, 15 May 2015 17:47:29 +0000 (15 17:47 +0000) | ||
| tree | 41c40103e1b049d25bc519ca0688f48d82d61656 | treesnapshot (tar.gz zip) |
| parent | ff069f024ae8cf15d53429e034d67ddcece0f67a | commitdiff |
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.
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.
| ChangeLog | diffblobblamehistory | |
| NEWS | diffblobblamehistory | |
| math/auto-libm-test-in | diffblobblamehistory | |
| math/auto-libm-test-out | diffblobblamehistory | |
| sysdeps/ieee754/flt-32/k_tanf.c | diffblobblamehistory |