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