[PATCH] D127281: [Greedy RegAlloc] Fix the handling of split register in last chance re-coloring.

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


================
Comment at: llvm/lib/CodeGen/RegAllocGreedy.cpp:1907
       std::tie(LI, PhysReg) = RecolorStack[I];
-      Matrix->assign(*LI, PhysReg);
+      if (!LI->empty() && !MRI->reg_nodbg_empty(LI->reg()))
+        Matrix->assign(*LI, PhysReg);
----------------
The possibility for splitting during last chance recoloring confused me when I was last looking at this here. Is it a problem that the split was also not rolled back as well?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D127281/new/

https://reviews.llvm.org/D127281