[PATCH] D120813: AMDGPU: Skip tryFoldRegSequence if no valid regclasses for its users.

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

What's the reasoning for this? Won't this break chains of REG_SEQUENCE? In particular I do expect to see some REG_SEQUENCE (REG_SEQUENCE), (REG_SEQUENCE) patterns



================
Comment at: llvm/lib/Target/AMDGPU/SIInstrInfo.cpp:4758
 
+bool SIInstrInfo::isVariadicOrInvalidRegClassAtOpIdx(const MachineInstr &MI,
+                                                     unsigned OpIdx) const {
----------------
isUnknownRegClass?


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  https://reviews.llvm.org/D120813/new/

https://reviews.llvm.org/D120813