Comment # 14
on bug 97988
from Christian König
(In reply to Marek Olšák from comment #13) > (In reply to Tom Stellard from comment #12) > > > > I think the best solution here would be to teach the backend how to do a > > scalar select based on value of vccz. > > You are missing the point. The condition code (VCC) isn't the same across > all threads. The problem is that the conditional assignment is transformed > into a form that makes descriptor load addresses non-uniform (dependent on a > VGPR). There is nothing the AMDGPU backend can do about it. It's not a > problem in the backend. Well the backend could iterate over all the variants to handle that, but I have strong doubts that this would result in optimal performance. So I think the best solution for now would be to mark the texture intrinsic in a way which disallows such optimizations.
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