On Wednesday, April 01, 2015 07:22:40 PM Connor Abbott wrote: > I think it might be better here if we had a callback that backends can > fill in that tells you when an instruction can be pulled out by the > sel peephole. As Jason noted, you won't be able to do this for > everything (notably, output writes and variable writes) and we'll > probably need special handling for predicating discards if we want to > be able to flatten everything. There are also a few cases where on > i965 we aren't activating it when we could. Even then, I didn't think > we'd need something this general, but with different backends with > such varying needs I guess it makes more sense to go with the more > general solution.
NIR does have nir_intrinsic_discard_if, which performs a conditional discard. Assignments can be handled by conditional selects. In the absence of other memory writes (atomics, images, etc), that's probably sufficient, no? --Ken
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