[PATCH] D37595: AMDGPU: Recompute scc liveness

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.

The various scalar bit operations set SCC,
so one is erased or moved it needs to be recomputed.
Not sure why the existing tests don't fail on this.


https://reviews.llvm.org/D37595

Files:
  lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp


Index: lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
===================================================================
--- lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
+++ lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
@@ -111,7 +111,7 @@
   const SIInstrInfo *TII = ST.getInstrInfo();
   MachineRegisterInfo &MRI = MF.getRegInfo();
   LiveIntervals *LIS = &getAnalysis<LiveIntervals>();
-  DenseSet<unsigned> RecalcRegs({AMDGPU::EXEC_LO, AMDGPU::EXEC_HI});
+  DenseSet<unsigned> RecalcRegs({AMDGPU::EXEC_LO, AMDGPU::EXEC_HI, AMDGPU::SCC});
   bool Changed = false;
 
   for (MachineBasicBlock &MBB : MF) {


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