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apparently unswitch had the same "Feature". Stop its 

claims that it preserves domfrontier if it doesn't really.

llvm-svn: 112445
This commit is contained in:
Chris Lattner 2010-08-29 17:23:19 +00:00
parent d6f46b8af8
commit bc1a65ac6c
1 changed files with 2 additions and 7 deletions
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9
llvm/lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -77,7 +77,6 @@ namespace {
bool redoLoop;
Loop *currentLoop;
DominanceFrontier *DF;
DominatorTree *DT;
BasicBlock *loopHeader;
BasicBlock *loopPreheader;
@ -93,14 +92,14 @@ namespace {
static char ID; // Pass ID, replacement for typeid
explicit LoopUnswitch(bool Os = false) :
LoopPass(ID), OptimizeForSize(Os), redoLoop(false),
currentLoop(NULL), DF(NULL), DT(NULL), loopHeader(NULL),
currentLoop(NULL), DT(NULL), loopHeader(NULL),
loopPreheader(NULL) {}
bool runOnLoop(Loop *L, LPPassManager &LPM);
bool processCurrentLoop();
/// This transformation requires natural loop information & requires that
/// loop preheaders be inserted into the CFG...
/// loop preheaders be inserted into the CFG.
///
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredID(LoopSimplifyID);
@ -110,7 +109,6 @@ namespace {
AU.addRequiredID(LCSSAID);
AU.addPreservedID(LCSSAID);
AU.addPreserved<DominatorTree>();
AU.addPreserved<DominanceFrontier>();
}
private:
@ -201,7 +199,6 @@ static Value *FindLIVLoopCondition(Value *Cond, Loop *L, bool &Changed) {
bool LoopUnswitch::runOnLoop(Loop *L, LPPassManager &LPM_Ref) {
LI = &getAnalysis<LoopInfo>();
LPM = &LPM_Ref;
DF = getAnalysisIfAvailable<DominanceFrontier>();
DT = getAnalysisIfAvailable<DominatorTree>();
currentLoop = L;
Function *F = currentLoop->getHeader()->getParent();
@ -216,8 +213,6 @@ bool LoopUnswitch::runOnLoop(Loop *L, LPPassManager &LPM_Ref) {
// FIXME: Reconstruct dom info, because it is not preserved properly.
if (DT)
DT->runOnFunction(*F);
if (DF)
DF->runOnFunction(*F);
}
return Changed;
}