Scott, > I still maintain that hardware fsin and fcos are valid and > valuable for certain classes of applications,
I agree. I've just been trying to demonstrate that your test doesn't check sin and cos accuracies, but that sin^2 + cos^2 == 1. If I had a sin that always returned 1.0 and a cos that always returned 0.0 they would pass your test. :-) > and that we > need better options and documentation -- both of which I'm > more than happy to work on. I look forward to your future comments. By all means, there are many holes in GCC documentation and you've probably tripped at one. Yet, I think that enabling x87 transcendentals on x86 only with -funsafe-math-optimizations makes sense, because they're anything but safe: "(a) assume that arguments and results are valid and (b) may violate IEEE or ANSI standards." And it doesn't make sense to enable them on x86_64 because they're not more optimal than the SSE routines. Regards, -- _______________________________________________________ Evandro Menezes AMD Austin, TX
