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update the comment above llvm::SplitCriticalEdge, and make

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it abort on IndirectBrInst as describe in the comment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85688 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2009-10-31 21:51:10 +00:00
parent bcf2f2c159
commit 1b98ff3e4f
2 changed files with 30 additions and 9 deletions
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12
include/llvm/Transforms/Utils/BasicBlockUtils.h
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@@ -116,8 +116,8 @@ bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
/// SplitCriticalEdge - If this edge is a critical edge, insert a new node to
/// split the critical edge. This will update DominatorTree and
/// DominatorFrontier information if it is available, thus calling this pass
/// will not invalidate either of them. This returns true if the edge was split,
/// false otherwise.
/// will not invalidate either of them. This returns the new block if the edge
/// was split, null otherwise.
///
/// If MergeIdenticalEdges is true (not the default), *all* edges from TI to the
/// specified successor will be merged into the same critical edge block.
@@ -126,10 +126,16 @@ bool isCriticalEdge(const TerminatorInst *TI, unsigned SuccNum,
/// dest go to one block instead of each going to a different block, but isn't
/// the standard definition of a "critical edge".
///
/// It is invalid to call this function on a critical edge that starts at an
/// IndirectBrInst. Splitting these edges will almost always create an invalid
/// program because the addr of the new block won't be the one that is jumped
/// to.
///
BasicBlock *SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum,
Pass *P = 0, bool MergeIdenticalEdges = false);
inline BasicBlock *SplitCriticalEdge(BasicBlock *BB, succ_iterator SI, Pass *P = 0) {
inline BasicBlock *SplitCriticalEdge(BasicBlock *BB, succ_iterator SI,
Pass *P = 0) {
return SplitCriticalEdge(BB->getTerminator(), SI.getSuccessorIndex(), P);
}