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Make RecursivelyDeleteTriviallyDeadInstructions,

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RecursivelyDeleteDeadPHINode, and DeleteDeadPHIs return a flag
indicating whether they made any changes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92732 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-01-05 15:45:31 +00:00
parent ad2cee44e0
commit 90fe0bd68c
4 changed files with 25 additions and 15 deletions
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5
include/llvm/Transforms/Utils/BasicBlockUtils.h
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@ -40,8 +40,9 @@ 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.
void DeleteDeadPHIs(BasicBlock *BB);
/// it is ultimately unused or if it reaches an unused cycle. Return true
/// if any PHIs were deleted.
bool DeleteDeadPHIs(BasicBlock *BB);
/// MergeBlockIntoPredecessor - Attempts to merge a block into its predecessor,
/// if possible. The return value indicates success or failure.