4 Dec
2014
4 Dec
'14
2:13 p.m.
https://bugs.freedesktop.org/show_bug.cgi?id=83510
--- Comment #11 from Henri Verbeet hverbeet@gmail.com --- (In reply to Marek Olšák from comment #10)
However, Tonga and later hardware doesn't have the legacy dx9 opcodes for MUL, MAD, RCP, RSQ, and LOG and they must be emulated with a comparison (or V_CLASS_F32 that returns whether it's NaN/+-Inf/Denorm/+-0/etc) + conditional assignment. It's better to do the conditional assignment after every RCP than after every MUL.
Interesting, I wonder how that works out for Direct3D 9 applications. I don't suppose there's a global switch instead like (at least some) Intel and NVIDIA hardware has?
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