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| author | Dan Gohman <gohman@apple.com> | 2009-11-05 21:11:53 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-11-05 21:11:53 +0000 |
| commit | 03e896bd6073efc4523d8bcd0239d6ed62126db7 (patch) | |
| tree | 940b395910c450d7c9e00a014e1592e4982bdca8 /lib/Transforms/Scalar/LICM.cpp | |
| parent | 7040d6e2f5d503e9948b9caff940a66238a0c605 (diff) | |
| download | external_llvm-03e896bd6073efc4523d8bcd0239d6ed62126db7.zip external_llvm-03e896bd6073efc4523d8bcd0239d6ed62126db7.tar.gz external_llvm-03e896bd6073efc4523d8bcd0239d6ed62126db7.tar.bz2 | |
Update various Loop optimization passes to cope with the possibility that
LoopSimplify form may not be available.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86175 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/LICM.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LICM.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/Transforms/Scalar/LICM.cpp b/lib/Transforms/Scalar/LICM.cpp index 756fbf3..104c873 100644 --- a/lib/Transforms/Scalar/LICM.cpp +++ b/lib/Transforms/Scalar/LICM.cpp @@ -263,7 +263,6 @@ bool LICM::runOnLoop(Loop *L, LPPassManager &LPM) { // Get the preheader block to move instructions into... Preheader = L->getLoopPreheader(); - assert(Preheader&&"Preheader insertion pass guarantees we have a preheader!"); // Loop over the body of this loop, looking for calls, invokes, and stores. // Because subloops have already been incorporated into AST, we skip blocks in @@ -286,12 +285,14 @@ bool LICM::runOnLoop(Loop *L, LPPassManager &LPM) { // us to sink instructions in one pass, without iteration. After sinking // instructions, we perform another pass to hoist them out of the loop. // - SinkRegion(DT->getNode(L->getHeader())); - HoistRegion(DT->getNode(L->getHeader())); + if (L->hasDedicatedExits()) + SinkRegion(DT->getNode(L->getHeader())); + if (Preheader) + HoistRegion(DT->getNode(L->getHeader())); // Now that all loop invariants have been removed from the loop, promote any // memory references to scalars that we can... - if (!DisablePromotion) + if (!DisablePromotion && Preheader && L->hasDedicatedExits()) PromoteValuesInLoop(); // Clear out loops state information for the next iteration |