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Summary: 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. Reviewers: arsenm Subscribers: MatzeB, arsenm, llvm-commits, kzhuravl Differential Revision: https://reviews.llvm.org/D23687 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279867 91177308-0d34-0410-b5e6-96231b3b80d8
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