[PATCH] D147721: [AMDGPU] Fix a case of updating LiveIntervals in SIOptimizeExecMaskingPreRA

[Jay Foad via Phabricator via llvm-commits]

foad updated this revision to Diff 511652.
foad added a comment.

Rebase.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D147721/new/

https://reviews.llvm.org/D147721

Files:
  llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp


Index: llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
===================================================================
--- llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
+++ llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
@@ -294,7 +294,13 @@
 
       LIS->removeVRegDefAt(*SelLI, SelIdx.getRegSlot());
       LIS->RemoveMachineInstrFromMaps(*Sel);
+      bool ShrinkSel = Sel->getOperand(0).readsReg();
       Sel->eraseFromParent();
+      if (ShrinkSel) {
+        // The result of the V_CNDMASK was a subreg def which counted as a read
+        // from the other parts of the reg. Shrink their live ranges.
+        LIS->shrinkToUses(SelLI);
+      }
     }
   }
 


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