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Make EliminateDuplicatePHINodes() available as a utility function

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89297 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2009-11-19 02:02:10 +00:00
parent 77bd09b650
commit 20f4d34fe3
2 changed files with 9 additions and 2 deletions
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9
include/llvm/Transforms/Utils/Local.h
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@ -107,7 +107,14 @@ void MergeBasicBlockIntoOnlyPred(BasicBlock *BB, Pass *P = 0);
/// rewriting all the predecessors to branch to the successor block and return
/// true. If we can't transform, return false.
bool TryToSimplifyUncondBranchFromEmptyBlock(BasicBlock *BB);
/// EliminateDuplicatePHINodes - Check for and eliminate duplicate PHI
/// nodes in this block. This doesn't try to be clever about PHI nodes
/// which differ only in the order of the incoming values, but instcombine
/// orders them so it usually won't matter.
///
bool EliminateDuplicatePHINodes(BasicBlock *BB);
/// SimplifyCFG - This function is used to do simplification of a CFG. For
/// example, it adjusts branches to branches to eliminate the extra hop, it
/// eliminates unreachable basic blocks, and does other "peephole" optimization

2
lib/Transforms/Utils/SimplifyCFG.cpp
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@ -1594,7 +1594,7 @@ static bool SimplifyCondBranchToCondBranch(BranchInst *PBI, BranchInst *BI) {
/// which differ only in the order of the incoming values, but instcombine
/// orders them so it usually won't matter.
///
static bool EliminateDuplicatePHINodes(BasicBlock *BB) {
bool llvm::EliminateDuplicatePHINodes(BasicBlock *BB) {
bool Changed = false;
// This implementation doesn't currently consider undef operands