[PATCH] D91358: [ARM][RegAlloc] Add t2LoopEndDec
Bjorn Pettersson via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Nov 25 13:06:00 PST 2020
bjope added inline comments.
Comment at: llvm/lib/CodeGen/PHIElimination.cpp:452
+ "Expected operand 0 to be a reg def!");
This is only valid if there are no other uses of SrcReg (no anywhere else, and not in the current MBB that we are eliminating PHI nodes inside, such as another PHI node in MBB).
Haven't analyzed it more closely than that. But I don't know if it can be generally guaranteed that the def in an UnspillableTerminator only has a single use. Is such a rule guaranteed here (or even feasible)?
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