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| author | nsz <nsz@port70.net> | 2012-03-22 14:54:47 +0100 |
|---|---|---|
| committer | nsz <nsz@port70.net> | 2012-03-22 14:54:47 +0100 |
| commit | a4a0c91275788407763b1e5a9da17b777495ca85 (patch) | |
| tree | 1c4e53cfe0c6b0ab80df621813acb74715e9ab3b /include | |
| parent | 2e0c1fed36be1f1435de79bfc7cdc34824cb5614 (diff) | |
| download | musl-a4a0c91275788407763b1e5a9da17b777495ca85.tar.gz musl-a4a0c91275788407763b1e5a9da17b777495ca85.tar.xz musl-a4a0c91275788407763b1e5a9da17b777495ca85.zip | |
acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))
the old formula atan2(1,sqrt((1+x)/(1-x))) was faster but could give nan result at x=1 when the rounding mode is FE_DOWNWARD (so 1-1 == -0 and 2/-0 == -inf), the new formula gives -0 at x=+-1 with downward rounding.
Diffstat (limited to 'include')
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