[PATCH] D108830: [AMDGPU] Propagate defining src reg for AGPR to AGPR Copys

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec added inline comments.


================
Comment at: llvm/lib/Target/AMDGPU/GCNPreRAOptimizations.cpp:119
+      for (auto &Def : MRI->def_instructions(SrcReg)) {
+        if (SrcSubReg != Def.getOperand(0).getSubReg())
+          continue;
----------------
I am no sure why do you need to match SRC and DST subregs. Why not just copy a source from Def here whatever it is?


Repository:
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CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D108830/new/

https://reviews.llvm.org/D108830