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| author | Joseph Myers <joseph@codesourcery.com> | 2015-02-26 21:06:34 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2015-02-26 21:06:34 +0000 |
| commit | 1d9ab20c14211abbf45514e63c190dfeec27fa5e (patch) | |
| tree | cbe705e320799863f477d32c3062f6260c0c72a2 /hurd/Notes | |
| parent | ec0ce0d3be4ae21add09139c705852ed8bb114c7 (diff) | |
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Fix ldbl-128/ldbl-128ibm acosl inaccuracy (bug 18038, bug 18039).
The ldbl-128 and ldbl-128ibm implementations of acosl have similar
bugs, using a threshold of 0x1p-57L to determine when they just return
pi/2. Since the result pi/2 - asinl (x) is roughly pi/2 - x for small
x, the relevant cut-off is actually x being < 0.5ulp of 1. This patch
fixes the implementations to use that cut-off and adds tests of small
acos arguments.
Tested for powerpc and mips64. Also tested for x86_64 and x86; no
ulps updates needed.
[BZ #18038]
[BZ #18039]
* sysdeps/ieee754/ldbl-128/e_acosl.c (__ieee754_acosl): Only
return pi/2 for arguments below 0x1p-113L.
* sysdeps/ieee754/ldbl-128ibm/e_acosl.c (__ieee754_acosl): Only
return pi/2 for arguments below 0x1p-106L.
* math/auto-libm-test-in: Add more tests of acos.
* math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'hurd/Notes')
0 files changed, 0 insertions, 0 deletions