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Make LoopUnswitch preserve ScalarEvolution by just forgetting everything about

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a loop when unswitching it. It only does this in the complex case, because
everything should be fine already in the simple case.

llvm-svn: 125369
This commit is contained in:
Cameron Zwarich 2011-02-11 06:08:28 +00:00
parent a71a5e4f90
commit ef11d9219e
1 changed files with 5 additions and 0 deletions
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5
lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -37,6 +37,7 @@
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/LoopPass.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Transforms/Utils/Cloning.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
@ -110,6 +111,7 @@ namespace {
AU.addRequiredID(LCSSAID);
AU.addPreservedID(LCSSAID);
AU.addPreserved<DominatorTree>();
AU.addPreserved<ScalarEvolution>();
}
private:
@ -574,6 +576,9 @@ void LoopUnswitch::UnswitchNontrivialCondition(Value *LIC, Constant *Val,
<< " blocks] in Function " << F->getName()
<< " when '" << *Val << "' == " << *LIC << "\n");
if (ScalarEvolution *SE = getAnalysisIfAvailable<ScalarEvolution>())
SE->forgetLoop(L);
LoopBlocks.clear();
NewBlocks.clear();