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| author | Andrew Trick <atrick@apple.com> | 2011-04-27 05:42:17 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2011-04-27 05:42:17 +0000 |
| commit | 104f4adeac9f555530ad24be609dae9d09baea18 (patch) | |
| tree | a3e5c7f63cd95f20a008ed0cbfa82108cd0f0523 /lib/Analysis/ScalarEvolution.cpp | |
| parent | 3f5c8329098abbd885f69ff8a11af62561d9d41b (diff) | |
Test case and comment for PR9633.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130294 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | lib/Analysis/ScalarEvolution.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp index 9396b07dab..1bef857e70 100644 --- a/lib/Analysis/ScalarEvolution.cpp +++ b/lib/Analysis/ScalarEvolution.cpp @@ -4705,8 +4705,9 @@ const SCEV *ScalarEvolution::computeSCEVAtScope(const SCEV *V, const Loop *L) { getAddRecExpr(NewOps, AddRec->getLoop(), AddRec->getNoWrapFlags(SCEV::FlagNW)); AddRec = dyn_cast<SCEVAddRecExpr>(FoldedRec); - // In cases with "undef" values, a loop's own recurrence may - // fold into a constant. Go ahead and return the optimistic value. + // The addrec may be folded to a nonrecurrence, for example, if the + // induction variable is multiplied by zero after constant folding. Go + // ahead and return the folded value. if (!AddRec) return FoldedRec; break; |