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Add a verifyAnalysis to LoopInfo, LoopSimplify, and LCSSA form that verify

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that these passes are properly preserved.

Fix several transformation passes that claimed to preserve LoopSimplify
form but weren't.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80926 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-09-03 16:31:42 +00:00
parent c8b26880fd
commit 8fc5ad3369
10 changed files with 287 additions and 143 deletions
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21
include/llvm/Transforms/Utils/BasicBlockUtils.h
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@@ -126,10 +126,10 @@ 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".
///
bool SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum, Pass *P = 0,
bool MergeIdenticalEdges = false);
BasicBlock *SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum,
Pass *P = 0, bool MergeIdenticalEdges = false);
inline bool 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);
}
@@ -143,7 +143,7 @@ inline bool SplitCriticalEdge(BasicBlock *Succ, pred_iterator PI, Pass *P = 0) {
TerminatorInst *TI = (*PI)->getTerminator();
for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i)
if (TI->getSuccessor(i) == Succ)
MadeChange |= SplitCriticalEdge(TI, i, P);
MadeChange |= !!SplitCriticalEdge(TI, i, P);
return MadeChange;
}
@@ -151,8 +151,9 @@ inline bool SplitCriticalEdge(BasicBlock *Succ, pred_iterator PI, Pass *P = 0) {
/// and return true, otherwise return false. This method requires that there be
/// an edge between the two blocks. If P is specified, it updates the analyses
/// described above.
inline bool SplitCriticalEdge(BasicBlock *Src, BasicBlock *Dst, Pass *P = 0,
bool MergeIdenticalEdges = false) {
inline BasicBlock *SplitCriticalEdge(BasicBlock *Src, BasicBlock *Dst,
Pass *P = 0,
bool MergeIdenticalEdges = false) {
TerminatorInst *TI = Src->getTerminator();
unsigned i = 0;
while (1) {
@@ -180,8 +181,12 @@ BasicBlock *SplitBlock(BasicBlock *Old, Instruction *SplitPt, Pass *P);
/// Preds array, which has NumPreds elements in it. The new block is given a
/// suffix of 'Suffix'. This function returns the new block.
///
/// This currently updates the LLVM IR, AliasAnalysis, DominatorTree and
/// DominanceFrontier, but no other analyses.
/// This currently updates the LLVM IR, AliasAnalysis, DominatorTree,
/// DominanceFrontier, LoopInfo, and LCCSA but no other analyses.
/// In particular, it does not preserve LoopSimplify (because it's
/// complicated to handle the case where one of the edges being split
/// is an exit of a loop with other exits).
///
BasicBlock *SplitBlockPredecessors(BasicBlock *BB, BasicBlock *const *Preds,
unsigned NumPreds, const char *Suffix,
Pass *P = 0);