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authornsz <nsz@port70.net>2012-03-22 14:54:47 +0100
committernsz <nsz@port70.net>2012-03-22 14:54:47 +0100
commita4a0c91275788407763b1e5a9da17b777495ca85 (patch)
tree1c4e53cfe0c6b0ab80df621813acb74715e9ab3b /include
parent2e0c1fed36be1f1435de79bfc7cdc34824cb5614 (diff)
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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.
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