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We need to update PHIs containing the exiting block, not the exit block. We really should come up with better names for these.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50770 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-05-06 20:55:16 +00:00
parent 919852b0e6
commit 8b23bb792e
1 changed files with 8 additions and 3 deletions
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11
lib/Transforms/Scalar/LoopDeletion.cpp
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@ -192,8 +192,9 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
return false;
// Now that we know the removal is safe, remove the loop by changing the
// branch from the preheader to go to the single exiting block.
// branch from the preheader to go to the single exit block.
BasicBlock* exitBlock = exitBlocks[0];
BasicBlock* exitingBlock = exitingBlocks[0];
// Because we're deleting a large chunk of code at once, the sequence in which
// we remove things is very important to avoid invalidation issues. Don't
@ -218,7 +219,7 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
// the preheader instead of the exiting block.
BasicBlock::iterator BI = exitBlock->begin();
while (PHINode* P = dyn_cast<PHINode>(BI)) {
P->replaceUsesOfWith(exitBlock, preheader);
P->replaceUsesOfWith(exitingBlock, preheader);
BI++;
}
@ -253,8 +254,12 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
// NOTE: This iteration is safe because erasing the block does not remove its
// entry from the loop's block list. We do that in the next section.
for (Loop::block_iterator LI = L->block_begin(), LE = L->block_end();
LI != LE; ++LI)
LI != LE; ++LI) {
for (Value::use_iterator UI = (*LI)->use_begin(), UE = (*LI)->use_end();
UI != UE; ++UI)
(*UI)->dump();
(*LI)->eraseFromParent();
}
// Finally, the blocks from loopinfo. This has to happen late because
// otherwise our loop iterators won't work.