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Add a basic verifier for SCEV's backedge taken counts.

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Enabled with -verify-scev. This could be extended significantly but hopefully
catches the common cases now. Note that it's not enabled by default in any
configuration because the way it tries to distinguish SCEVs is still fragile and
may produce false positives. Also the test-suite isn't clean yet, one example
is that it fails if a pass drops an NSW bit but it's still present in SCEV's
cached. Cleaning up all those cases will take some time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166786 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2012-10-26 17:31:32 +00:00
parent 12145f0339
commit ff18310274
2 changed files with 69 additions and 0 deletions
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include/llvm/Analysis/ScalarEvolution.h
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@@ -874,6 +874,7 @@ namespace llvm {
virtual void releaseMemory();
virtual void getAnalysisUsage(AnalysisUsage &AU) const;
virtual void print(raw_ostream &OS, const Module* = 0) const;
virtual void verifyAnalysis() const;
private:
FoldingSet<SCEV> UniqueSCEVs;