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Add a new MachineBasicBlock utility function, isLayoutSuccessor, that
can be used when deciding if a block can transfer control to another via a fall-through instead of a branch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56968 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -234,6 +234,13 @@ public:
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/// block.
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bool isSuccessor(MachineBasicBlock *MBB) const;
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/// isLayoutSuccessor - Return true if the specified MBB will be emitted
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/// immediately after this block, such that if this block exits by
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/// falling through, control will transfer to the specified MBB. Note
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/// that MBB need not be a successor at all, for example if this block
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/// ends with an unconditional branch to some other block.
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bool isLayoutSuccessor(MachineBasicBlock *MBB) const;
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/// getFirstTerminator - returns an iterator to the first terminator
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/// instruction of this basic block. If a terminator does not exist,
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/// it returns end()
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@ -254,6 +254,11 @@ bool MachineBasicBlock::isSuccessor(MachineBasicBlock *MBB) const {
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return I != Successors.end();
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}
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bool MachineBasicBlock::isLayoutSuccessor(MachineBasicBlock *MBB) const {
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MachineFunction::const_iterator I(this);
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return next(I) == MachineFunction::const_iterator(MBB);
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}
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/// removeFromParent - This method unlinks 'this' from the containing function,
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/// and returns it, but does not delete it.
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MachineBasicBlock *MachineBasicBlock::removeFromParent() {
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