[PATCH] D139852: [amdgpu] Lower CopyToReg into SGPR explicitly to avoid illegal vgpr to sgpr copy

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


================
Comment at: llvm/lib/Target/AMDGPU/SIISelLowering.cpp:11916-11918
+      // CopyToReg may be writing a constant to a sgpr as part of a calling
+      // convention. If that constant is selected to a vgpr then we later need
+      // to copy it into a sgpr. Instead, special case the copying-to-sgpr here to
----------------
Can you teach isVGPRImm to deal with this


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D139852/new/

https://reviews.llvm.org/D139852