This was a bad idea because:
- it diverges too much with the fragment shader epilog
- it doesn't allow to implement alpha-to-coverage via MRTZ correctly
- it was supposed to be used by LLVM but this never happened
Reverting this back allows us to fix alpha-to-coverage via MRTZ
on GFX11 easily, including for fragment shader epilogs.
fossils-db (NAVI21):
Totals from 20411 (15.13% of 134913) affected shaders:
VGPRs: 972056 -> 971400 (-0.07%); split: -0.08%, +0.01%
CodeSize: 92284804 -> 92295392 (+0.01%); split: -0.05%, +0.06%
MaxWaves: 465010 -> 465166 (+0.03%); split: +0.03%, -0.00%
Instrs: 17034162 -> 17034963 (+0.00%); split: -0.00%, +0.01%
Latency: 252013190 -> 251971764 (-0.02%); split: -0.03%, +0.02%
InvThroughput: 45859625 -> 45842556 (-0.04%); split: -0.04%, +0.01%
VClause: 324627 -> 324629 (+0.00%); split: -0.03%, +0.03%
SClause: 672918 -> 672826 (-0.01%); split: -0.05%, +0.04%
Copies: 1172126 -> 1158152 (-1.19%); split: -1.20%, +0.01%
Branches: 420602 -> 420604 (+0.00%); split: -0.00%, +0.00%
PreSGPRs: 1025441 -> 1025481 (+0.00%)
PreVGPRs: 861787 -> 860650 (-0.13%); split: -0.17%, +0.03%
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20126>
Samuel Pitoiset
a297ac10a4