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By default PHINode::removeIncomingValue will delete the phi node if the last

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incoming value is deleted!

llvm-svn: 4076
This commit is contained in:
Chris Lattner 2002-10-08 21:31:56 +00:00
parent 3cf20c3f14
commit aa8b6d047c
1 changed files with 8 additions and 1 deletions
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9
include/llvm/iPHINode.h
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@ -65,7 +65,14 @@ public:
/// removeIncomingValue - Remove an incoming value. This is useful if a
/// predecessor basic block is deleted. The value removed is returned.
Value *removeIncomingValue(const BasicBlock *BB);
///
/// If the last incoming value for a PHI node is removed (and DeletePHIIfEmpty
/// is true), the PHI node is destroyed and any uses of it are replaced with
/// dummy values. The only time there should be zero incoming values to a PHI
/// node is when the block is dead, so this strategy is sound.
///
Value *removeIncomingValue(const BasicBlock *BB,
bool DeletePHIIfEmpty = true);
/// getBasicBlockIndex - Return the first index of the specified basic
/// block in the value list for this PHI. Returns -1 if no instance.