[PATCH] D87427: [GlobalISel] Add a `X, Y = G_UNMERGE(G_ZEXT Z)` -> X = G_ZEXT Z; Y = 0 combine

[Matt Arsenault via Phabricator via llvm-commits]

arsenm accepted this revision.
arsenm added a comment.
This revision is now accepted and ready to land.

LGTM with nit. Could possibly use a legality check but I could't come up with an example where it would matter



================
Comment at: llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp:1743
+
+  Register ZeroReg = 0;
+  for (unsigned Idx = 1, EndIdx = MI.getNumDefs(); Idx != EndIdx; ++Idx) {
----------------
Don't need = 0


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D87427/new/

https://reviews.llvm.org/D87427