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Add a new assertion to check that stuff is happening right 

Ironically the exit block modification code wasn't updating the exit block
information itself.  Fix this.

llvm-svn: 5659
This commit is contained in:
Chris Lattner 2003-02-27 22:31:07 +00:00
parent 1ad80e2511
commit 10b2b055e8
1 changed files with 8 additions and 3 deletions
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9
llvm/lib/Transforms/Scalar/LoopSimplify.cpp
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@ -95,6 +95,8 @@ bool Preheaders::ProcessLoop(Loop *L) {
for (unsigned i = 0, e = L->getExitBlocks().size(); i != e; ++i)
if (!DS.dominates(Header, L->getExitBlocks()[i])) {
RewriteLoopExitBlock(L, L->getExitBlocks()[i]);
assert(DS.dominates(Header, L->getExitBlocks()[i]) &&
"RewriteLoopExitBlock failed?");
NumInserted++;
Changed = true;
}
@ -270,19 +272,22 @@ void Preheaders::RewriteLoopExitBlock(Loop *L, BasicBlock *Exit) {
DominatorSet &DS = getAnalysis<DominatorSet>();
assert(!DS.dominates(L->getHeader(), Exit) &&
"Loop already dominates exit block??");
assert(std::find(L->getExitBlocks().begin(), L->getExitBlocks().end(), Exit)
!= L->getExitBlocks().end() && "Not a current exit block!");
std::vector<BasicBlock*> LoopBlocks;
for (pred_iterator I = pred_begin(Exit), E = pred_end(Exit); I != E; ++I)
if (L->contains(*I))
LoopBlocks.push_back(*I);
BasicBlock *NewBB =
SplitBlockPredecessors(Exit, ".loopexit", LoopBlocks);
assert(!LoopBlocks.empty() && "No edges coming in from outside the loop?");
BasicBlock *NewBB = SplitBlockPredecessors(Exit, ".loopexit", LoopBlocks);
// Update Loop Information - we know that the new block will be in the parent
// loop of L.
if (Loop *Parent = L->getParentLoop())
Parent->addBasicBlockToLoop(NewBB, getAnalysis<LoopInfo>());
L->changeExitBlock(Exit, NewBB); // Update exit block information
// Update dominator information... The blocks that dominate NewBB are the
// intersection of the dominators of predecessors, plus the block itself.