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Preserve ScalarEvolution in the loop unroller.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109412 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-07-26 18:02:06 +00:00
parent 3d0c7231fd
commit 572365ec88
1 changed files with 6 additions and 0 deletions
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6
lib/Transforms/Utils/LoopUnroll.cpp
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@@ -24,6 +24,7 @@
#include "llvm/ADT/Statistic.h" #include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/ConstantFolding.h" #include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/LoopPass.h" #include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Support/Debug.h" #include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h" #include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h" #include "llvm/Transforms/Utils/BasicBlockUtils.h"
@@ -127,6 +128,11 @@ bool llvm::UnrollLoop(Loop *L, unsigned Count, LoopInfo* LI, LPPassManager* LPM)
return false; return false;
} }
// Notify ScalarEvolution that the loop will be substantially changed,
// if not outright eliminated.
if (ScalarEvolution *SE = LPM->getAnalysisIfAvailable<ScalarEvolution>())
SE->forgetLoop(L);
// Find trip count // Find trip count
unsigned TripCount = L->getSmallConstantTripCount(); unsigned TripCount = L->getSmallConstantTripCount();
// Find trip multiple if count is not available // Find trip multiple if count is not available