[PATCH] D75743: [GlobalISel] fix crash in narrowScalarExtract if DstRegs only has one register

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added inline comments.


================
Comment at: llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp:3688-3694
   Register DstReg = MI.getOperand(0).getReg();
-  if(MRI.getType(DstReg).isVector())
+  if (MRI.getType(DstReg).isVector())
     MIRBuilder.buildBuildVector(DstReg, DstRegs);
-  else
+  else if (DstRegs.size() > 1)
     MIRBuilder.buildMerge(DstReg, DstRegs);
+  else
+    MIRBuilder.buildCopy(DstReg, DstRegs[0]);
----------------
Could this just write the original result into DstReg and avoid the copy?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D75743/new/

https://reviews.llvm.org/D75743