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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-10-31 10:01:29 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-10-31 10:01:29 +0000 |
| commit | 4ad3d981b91ac1293b8f2be29e6452d5206107b8 (patch) | |
| tree | a46424493dbc6d8e6e735e80580ef0a56a0250a5 /lib/Transforms/Utils | |
| parent | 0ceb855d5251c67c3a129c172a520c1d2682c344 (diff) | |
| download | external_llvm-4ad3d981b91ac1293b8f2be29e6452d5206107b8.zip external_llvm-4ad3d981b91ac1293b8f2be29e6452d5206107b8.tar.gz external_llvm-4ad3d981b91ac1293b8f2be29e6452d5206107b8.tar.bz2 | |
LCSSA: Add a workaround for another nasty SCEV cache invalidation issue.
I'm not entirely happy with this solution, but I don't see a smarter way currently.
Fixes PR14214.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167112 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils')
| -rw-r--r-- | lib/Transforms/Utils/LCSSA.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Utils/LCSSA.cpp b/lib/Transforms/Utils/LCSSA.cpp index 833dea5..38c1495 100644 --- a/lib/Transforms/Utils/LCSSA.cpp +++ b/lib/Transforms/Utils/LCSSA.cpp @@ -255,6 +255,11 @@ bool LCSSA::ProcessInstruction(Instruction *Inst, if (Loop *L = LI->getLoopFor(ExitBB)) SE->forgetLoop(L); } + + // If we added a PHI, drop the cache to avoid invalidating SCEV caches. + // FIXME: This is a big hammer, can we clear the cache more selectively? + if (SE && !AddedPHIs.empty()) + SE->forgetLoop(L); // Rewrite all uses outside the loop in terms of the new PHIs we just // inserted. |