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Add MachineBasicBlock::isPredecessor().

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A->isPredecessor(B) is the same as B->isSuccessor(A), but it can
tolerate a B that is null or dangling. This shouldn't happen normally,
but it it useful for verification code.

llvm-svn: 160968
This commit is contained in:
Jakob Stoklund Olesen
2012-07-30 17:36:47 +00:00
parent 088e37c77a
commit fee94ca15b
2 changed files with 9 additions and 2 deletions
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7
llvm/lib/CodeGen/MachineBasicBlock.cpp
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@@ -540,9 +540,12 @@ MachineBasicBlock::transferSuccessorsAndUpdatePHIs(MachineBasicBlock *fromMBB) {
}
}
bool MachineBasicBlock::isPredecessor(const MachineBasicBlock *MBB) const {
return std::find(pred_begin(), pred_end(), MBB) != pred_end();
}
bool MachineBasicBlock::isSuccessor(const MachineBasicBlock *MBB) const {
const_succ_iterator I = std::find(Successors.begin(), Successors.end(), MBB);
return I != Successors.end();
return std::find(succ_begin(), succ_end(), MBB) != succ_end();
}
bool MachineBasicBlock::isLayoutSuccessor(const MachineBasicBlock *MBB) const {