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Don't try to move a MBB into the fall-through position if it's a landing pad or

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branches only to a landing pad. Without this check, the compiler would go into
an infinite loop because the branch to a landing pad is an "abnormal" edge which
wasn't being taken into account.

This is the meat of that fix:

  if (!PrevBB.canFallThrough() && !MBB->BranchesToLandingPad(MBB)) {

The other stuff is simplification of the "branches to a landing pad" code.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91161 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2009-12-11 21:47:36 +00:00
parent d037d7a497
commit c42a0b75a4
2 changed files with 26 additions and 29 deletions
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13
lib/CodeGen/MachineBasicBlock.cpp
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@ -457,16 +457,9 @@ MachineBasicBlock::BranchesToLandingPad(const MachineBasicBlock *MBB) const {
SmallSet<const MachineBasicBlock*, 32> Visited;
const MachineBasicBlock *CurMBB = MBB;
while (!Visited.count(CurMBB) && !CurMBB->isLandingPad()) {
if (CurMBB->size() != 1 || CurMBB->succ_empty() || CurMBB->succ_size() != 1)
break;
const TargetInstrInfo *TII =
CurMBB->getParent()->getTarget().getInstrInfo();
if (!TII->isUnpredicatedTerminator(CurMBB->begin()))
break;
Visited.insert(CurMBB);
while (!CurMBB->isLandingPad()) {
if (CurMBB->succ_size() != 1) break;
if (!Visited.insert(CurMBB)) break;
CurMBB = *CurMBB->succ_begin();
}