[PATCH] D136169: [AMDGPU] Avoid SCC clobbering before S_CSELECT_B32

[Jay Foad via Phabricator via llvm-commits]

foad added inline comments.


================
Comment at: llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp:2263
+          Register SCCCopy =
+              RS->scavengeRegister(getBoolRC(), std::prev(P), 0, !UseSGPR);
+          if (!SCCCopy)
----------------
None of this code should depend on wave size. You don't want getBoolRC here - that's for VCC which might be a register pair in wave64. You can always save SCC in a single 32-bit SGPR.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D136169/new/

https://reviews.llvm.org/D136169