diff options
| author | Joseph Myers <joseph@codesourcery.com> | 2015-05-15 17:47:29 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-05-15 17:47:29 +0000 |
| commit | 5a608ccc2d676aa124f6b55a7b20d071e408ca31 (patch) | |
| tree | 41c40103e1b049d25bc519ca0688f48d82d61656 /math/auto-libm-test-in | |
| parent | ff069f024ae8cf15d53429e034d67ddcece0f67a (diff) | |
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.
Diffstat (limited to 'math/auto-libm-test-in')
| -rw-r--r-- | math/auto-libm-test-in | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/math/auto-libm-test-in b/math/auto-libm-test-in index 2a88403aa7..e483569dad 100644 --- a/math/auto-libm-test-in +++ b/math/auto-libm-test-in @@ -2418,6 +2418,8 @@ tan pi/4 tan 0.75 tan 0x1p65 tan -0x1p65 +tan 0x1p-27 +tan -0x1p-27 tan 0xc.9p-4 tan 0xc.908p-4 tan 0xc.90cp-4 |