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Factor some code into a new FoldSingleEntryPHINodes method.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60501 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-12-03 19:44:02 +00:00
parent e96cc775e4
commit 29874e0dc6
6 changed files with 37 additions and 24 deletions
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8
include/llvm/Transforms/Utils/BasicBlockUtils.h
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@@ -30,6 +30,14 @@ class AliasAnalysis;
/// predecessors.
void DeleteDeadBlock(BasicBlock *BB);
/// FoldSingleEntryPHINodes - We know that BB has one predecessor. If there are
/// any single-entry PHI nodes in it, fold them away. This handles the case
/// when all entries to the PHI nodes in a block are guaranteed equal, such as
/// when the block has exactly one predecessor.
void FoldSingleEntryPHINodes(BasicBlock *BB);
/// MergeBlockIntoPredecessor - Attempts to merge a block into its predecessor,
/// if possible. The return value indicates success or failure.
bool MergeBlockIntoPredecessor(BasicBlock* BB, Pass* P = 0);