[Bug math/13942] x86 acos inaccurate near 1

[joseph at codesourcery dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13942

--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-04-05 00:12:54 UTC ---
fabs instructions could be used to avoid issues with sqrt(-0) = -0 (if 
that's the round-downward issue you mean) and may be cheaper than taking 
two square roots.

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