[PATCH] D23687: AMDGPU/SI: Use a better method for determining the largest pressure sets

[Tom Stellard via llvm-commits]

tstellarAMD created this revision.
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Herald added subscribers: kzhuravl, arsenm, MatzeB.

There are a few different sgpr pressure sets, but we only care about
the one which covers all of the sgprs.  We were using hard-coded
register pressure set names to determine the reg set id for the
biggest sgpr set.  However, we were using the wrong name, and this
method is pretty fragile, since the reg pressure set names may
change.

The new method just looks for the pressure set that contains the most
reg units and sets that set as our SGPR pressure set.  We've also
adopted the same technique for determining our VGPR pressure set.

https://reviews.llvm.org/D23687

Files:
  lib/Target/AMDGPU/SIMachineScheduler.cpp
  lib/Target/AMDGPU/SIRegisterInfo.cpp
  lib/Target/AMDGPU/SIRegisterInfo.h

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