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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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include/llvm/CodeGen/MachineBasicBlock.h
+4
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@@ -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;