[llvm] [BranchFolding] Fix missing predecessors of landing-pad (PR #77608)
Phoebe Wang via llvm-commits
llvm-commits at lists.llvm.org
Wed Jan 10 06:14:45 PST 2024
================
@@ -1363,6 +1363,14 @@ bool BranchFolder::OptimizeBlock(MachineBasicBlock *MBB) {
MachineBasicBlock *Pred = *(MBB->pred_end()-1);
Pred->ReplaceUsesOfBlockWith(MBB, &*FallThrough);
}
+ // Add rest successors of MBB to successors of FallThrough. Those
+ // successors are not directly reachable via MBB, so it should be
+ // landing-pad.
+ for (auto SI = MBB->succ_begin(), SE = MBB->succ_end(); SI != SE; ++SI)
+ if (*SI != &*FallThrough && !FallThrough->isSuccessor(*SI)) {
+ assert((*SI)->isEHPad() && "Bad CFG");
+ FallThrough->copySuccessor(MBB, SI);
+ }
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phoebewang wrote:
Can be put the code to `ReplaceUsesOfBlockWith`?
https://github.com/llvm/llvm-project/pull/77608
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