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Fix for LoopInfo::updateUnloop. Remove subloop blocks from former

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ancestor loops.

I have a unit test that depends on scev-unroll, which unfortunately
isn't checked in. But I will check it in when I can.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick 2011-08-11 20:27:32 +00:00
parent 26d2f0ac91
commit c12d9b9dfb
1 changed files with 29 additions and 16 deletions
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45
lib/Analysis/LoopInfo.cpp
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@ -411,6 +411,8 @@ public:
void updateBlockParents();
void removeBlocksFromAncestors();
void updateSubloopParents();
protected:
@ -467,6 +469,31 @@ void UnloopUpdater::updateBlockParents() {
}
}
/// removeBlocksFromAncestors - Remove unloop's blocks from all ancestors below
/// their new parents.
void UnloopUpdater::removeBlocksFromAncestors() {
// Remove unloop's blocks from all ancestors below their new parents.
for (Loop::block_iterator BI = Unloop->block_begin(),
BE = Unloop->block_end(); BI != BE; ++BI) {
Loop *NewParent = LI->getLoopFor(*BI);
// If this block is an immediate subloop, remove all blocks (including
// nested subloops) from ancestors below the new parent loop.
// Otherwise, if this block is in a nested subloop, skip it.
if (SubloopParents.count(NewParent))
NewParent = SubloopParents[NewParent];
else if (Unloop->contains(NewParent))
continue;
// Remove blocks from former Ancestors except Unloop itself which will be
// deleted.
for (Loop *OldParent = Unloop->getParentLoop(); OldParent != NewParent;
OldParent = OldParent->getParentLoop()) {
assert(OldParent && "new loop is not an ancestor of the original");
OldParent->removeBlockFromLoop(*BI);
}
}
}
/// updateSubloopParents - Update the parent loop for all subloops directly
/// nested within unloop.
void UnloopUpdater::updateSubloopParents() {
@ -605,22 +632,8 @@ void LoopInfo::updateUnloop(Loop *Unloop) {
UnloopUpdater Updater(Unloop, this);
Updater.updateBlockParents();
// Remove unloop's blocks from all ancestors below their new parents.
for (Loop::block_iterator BI = Unloop->block_begin(),
BE = Unloop->block_end(); BI != BE; ++BI) {
Loop *NewParent = getLoopFor(*BI);
// If this block is in a subloop, skip it.
if (Unloop->contains(NewParent))
continue;
// Remove blocks from former Ancestors except Unloop itself which will be
// deleted.
for (Loop *OldParent = Unloop->getParentLoop(); OldParent != NewParent;
OldParent = OldParent->getParentLoop()) {
assert(OldParent && "new loop is not an ancestor of the original");
OldParent->removeBlockFromLoop(*BI);
}
}
// Remove blocks from former ancestor loops.
Updater.removeBlocksFromAncestors();
// Add direct subloops as children in their new parent loop.
Updater.updateSubloopParents();