================
@@ -1624,6 +1632,15 @@ bool BranchFolder::OptimizeBlock(MachineBasicBlock *MBB)
{
} else {
DidChange = true;
PMBB->ReplaceUsesOfBlockWith(MBB, CurTBB);
+ // Add rest successors of MBB to successors of CurTBB. 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 != CurTBB && !CurTBB->isSuccessor(*SI)) {
+ assert((*SI)->isEHPad() && "Bad CFG");
+ CurTBB->copySuccessor(MBB, SI);
----------------
HaohaiWen wrote:
Before this code:
```
bb.0:
successors: %bb.6(0x7ffff800), %bb.5(0x00000800); %bb.6(100.00%), %bb.5(0.00%)
JMP_1 %bb.6
bb.3:
successors: %bb.6(0x80000000), %bb.4(0x00000800); %bb.6(100.00%), %bb.4(0.00%)
bb.4 (machine-block-address-taken, landing-pad, ehfunclet-entry):
; predecessors: %bb.3
successors: %bb.5(0x80000000); %bb.5(100.00%)
CLEANUPRET
bb.5 (landing-pad, ehfunclet-entry):
; predecessors: %bb.0, %bb.4
CLEANUPRET
bb.6:
; predecessors: %bb.3, %bb.0
RET 0
```
After:
```
bb.0:
successors: %bb.6(0x7ffff800), %bb.5(0x00000800); %bb.6(100.00%), %bb.5(0.00%)
JMP_1 %bb.6
bb.3:
successors: %bb.6(0x80000000), %bb.4(0x00000800); %bb.6(100.00%), %bb.4(0.00%)
bb.4 (machine-block-address-taken, landing-pad, ehfunclet-entry):
; predecessors: %bb.3, %bb.6
successors: %bb.5(0x80000000); %bb.5(100.00%)
CLEANUPRET
bb.5 (landing-pad, ehfunclet-entry):
; predecessors: %bb.0, %bb.4
CLEANUPRET
bb.6:
; predecessors: %bb.3, %bb.0
successors: %bb.4(0x00000800); %bb.4(0.00%)
RET 0
```
https://github.com/llvm/llvm-project/pull/77608
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