On 02/09/2012 01:38 PM, Tim Prince wrote: > x87 built-ins should be a fair compromise between speed, code size, and > accuracy, for long double, on most CPUs. As Richard says, it's > certainly possible to do better in the context of SSE, but gcc doesn't > know anything about the quality of math libraries present; it doesn't > even take into account whether it's glibc or something else.
Yeah. On x86_64 glibc, we should really get the sincos bg fixed. And it really is a bug: cos() and sin() are correctly rounded but sincos() isn't. Andrew.
