[llvm-branch-commits] [llvm] CodeGen: Check liveness before PHI sources when splitting a critical edge (PR #230375)

[Nikita Popov via llvm-branch-commits]

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@@ -1332,11 +1332,11 @@ MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ,
     MachineRegisterInfo *MRI = &getParent()->getRegInfo();
     for (unsigned i = 0, e = MRI->getNumVirtRegs(); i != e; ++i) {
       Register Reg = Register::index2VirtReg(i);
-      if (PHISrcRegs.count(Reg) || !LIS->hasInterval(Reg))
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nikic wrote:

Why can't we iterate over PHISrcRegs in the first place here (possibly after stabilizing it)?

https://github.com/llvm/llvm-project/pull/230375