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Re-apply 70645, converting ScalarEvolution to use

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CallbackVH, with fixes. allUsesReplacedWith need to
walk the def-use chains and invalidate all users of a
value that is replaced. SCEVs of users need to be
recalcualted even if the new value is equivalent. Also,
make forgetLoopPHIs walk def-use chains, since any
SCEV that depends on a PHI should be recalculated when
more information about that PHI becomes available.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70927 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-05-04 22:30:44 +00:00
parent bf2176a000
commit 35738ac150
9 changed files with 157 additions and 182 deletions
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7
lib/Transforms/Utils/BasicBlockUtils.cpp
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@ -78,9 +78,8 @@ void llvm::FoldSingleEntryPHINodes(BasicBlock *BB) {
/// DeleteDeadPHIs - Examine each PHI in the given block and delete it if it
/// is dead. Also recursively delete any operands that become dead as
/// a result. This includes tracing the def-use list from the PHI to see if
/// it is ultimately unused or if it reaches an unused cycle. If a
/// ValueDeletionListener is specified, it is notified of the deletions.
void llvm::DeleteDeadPHIs(BasicBlock *BB, ValueDeletionListener *VDL) {
/// it is ultimately unused or if it reaches an unused cycle.
void llvm::DeleteDeadPHIs(BasicBlock *BB) {
// Recursively deleting a PHI may cause multiple PHIs to be deleted
// or RAUW'd undef, so use an array of WeakVH for the PHIs to delete.
SmallVector<WeakVH, 8> PHIs;
@ -90,7 +89,7 @@ void llvm::DeleteDeadPHIs(BasicBlock *BB, ValueDeletionListener *VDL) {
for (unsigned i = 0, e = PHIs.size(); i != e; ++i)
if (PHINode *PN = dyn_cast_or_null<PHINode>(PHIs[i].operator Value*()))
RecursivelyDeleteDeadPHINode(PN, VDL);
RecursivelyDeleteDeadPHINode(PN);
}
/// MergeBlockIntoPredecessor - Attempts to merge a block into its predecessor,