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Re-apply r80926, with fixes: keep the domtree informed of new blocks

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that get created during loop unswitching, and fix SplitBlockPredecessors'
LCSSA updating code to create new PHIs instead of trying to just move
existing ones.

Also, optimize Loop::verifyLoop, since it gets called a lot. Use
searches on a sorted list of blocks instead of calling the "contains"
function, as is done in other places in the Loop class, since "contains"
does a linear search. Also, don't call verifyLoop from LoopSimplify or
LCSSA, as the PassManager is already calling verifyLoop as part of
LoopInfo's verifyAnalysis.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81221 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-09-08 15:45:00 +00:00
parent 6ca0b9e722
commit 5c89b5240c
12 changed files with 959 additions and 197 deletions
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17
lib/Transforms/Utils/LCSSA.cpp
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@ -58,6 +58,7 @@ namespace {
DominatorTree *DT;
std::vector<BasicBlock*> LoopBlocks;
PredIteratorCache PredCache;
Loop *L;
virtual bool runOnLoop(Loop *L, LPPassManager &LPM);
@ -72,9 +73,9 @@ namespace {
AU.setPreservesCFG();
AU.addRequiredID(LoopSimplifyID);
AU.addPreservedID(LoopSimplifyID);
AU.addRequired<LoopInfo>();
AU.addRequiredTransitive<LoopInfo>();
AU.addPreserved<LoopInfo>();
AU.addRequired<DominatorTree>();
AU.addRequiredTransitive<DominatorTree>();
AU.addPreserved<ScalarEvolution>();
AU.addPreserved<DominatorTree>();
@ -86,6 +87,15 @@ namespace {
AU.addPreserved<DominanceFrontier>();
}
private:
/// verifyAnalysis() - Verify loop nest.
virtual void verifyAnalysis() const {
#ifndef NDEBUG
// Check the special guarantees that LCSSA makes.
assert(L->isLCSSAForm());
#endif
}
void getLoopValuesUsedOutsideLoop(Loop *L,
SetVector<Instruction*> &AffectedValues,
const SmallVector<BasicBlock*, 8>& exitBlocks);
@ -107,7 +117,8 @@ Pass *llvm::createLCSSAPass() { return new LCSSA(); }
const PassInfo *const llvm::LCSSAID = &X;
/// runOnFunction - Process all loops in the function, inner-most out.
bool LCSSA::runOnLoop(Loop *L, LPPassManager &LPM) {
bool LCSSA::runOnLoop(Loop *l, LPPassManager &LPM) {
L = l;
PredCache.clear();
LI = &LPM.getAnalysis<LoopInfo>();