>> >> Rune Petersen >> > > Ok commited. I didn't look too closely at this but I've a couple of comments. - COS looks too complicated & broken. If you'd want to get 2 with a LOG2, you'd need 0.25 as source. But even using RCP instead, that's 5 instructions before performing the sine, for something you can easily do in two, using another constant (just 1 add + 1 cmp needed, if you use the right constants for the add). Maybe it's not that bad though, I don't know how many rgb and a slots it will actually consume, but still, are constant slots that rare? Second, you'd really need to do range reduction of the input, otherwise results will be very wrong for inputs outside [-pi, pi]. This would be true for taylor approximation too, of course, unless you do an infinite series :-). You wouldn't need to do that for SCS.
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