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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160968 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-07-30 17:36:47 +00:00
parent 97baaeaeb2
commit f192b507a3
2 changed files with 9 additions and 2 deletions
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4
include/llvm/CodeGen/MachineBasicBlock.h
View File

@ -379,6 +379,10 @@ public:
/// which refer to fromMBB to refer to this.
void transferSuccessorsAndUpdatePHIs(MachineBasicBlock *fromMBB);
/// isPredecessor - Return true if the specified MBB is a predecessor of this
/// block.
bool isPredecessor(const MachineBasicBlock *MBB) const;
/// isSuccessor - Return true if the specified MBB is a successor of this
/// block.
bool isSuccessor(const MachineBasicBlock *MBB) const;

7
lib/CodeGen/MachineBasicBlock.cpp
View File

@ -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 {