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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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6
include/llvm/Transforms/Utils/BasicBlockUtils.h
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@@ -25,7 +25,6 @@ namespace llvm {
class Instruction;
class Pass;
class AliasAnalysis;
class ValueDeletionListener;
/// DeleteDeadBlock - Delete the specified block, which must have no
/// predecessors.
@@ -41,9 +40,8 @@ void 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 DeleteDeadPHIs(BasicBlock *BB, ValueDeletionListener *VDL = 0);
/// it is ultimately unused or if it reaches an unused cycle.
void DeleteDeadPHIs(BasicBlock *BB);
/// MergeBlockIntoPredecessor - Attempts to merge a block into its predecessor,
/// if possible. The return value indicates success or failure.