[llvm-branch-commits] [llvm] [AMDGPU] Don't spill an SGPR while SCC is live in frame index lowering (PR #224080)

[Pankaj Dwivedi via llvm-branch-commits]

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@@ -3641,8 +3659,9 @@ bool SIRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator MI,
 
         if (Offset) {
           int64_t ScaledOffset = -Offset * ST.getWavefrontSize();
-          bool SCCLiveAfterMI = MI->definesRegister(AMDGPU::SCC, this) &&
-                                !MI->registerDefIsDead(AMDGPU::SCC, this);
+          bool SCCLiveAfterMI = MI->definesRegister(AMDGPU::SCC, this)
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PankajDwivedi-25 wrote:

I believe to answer "is SCC live after MI" only need
RS->isRegUsed(AMDGPU::SCC) ?

https://github.com/llvm/llvm-project/pull/224080