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Fix FoldSingleEntryPHINodes to update memdep and AA when it deletes

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phi nodes.  It is called from MergeBlockIntoPredecessor which is 
called from GVN, which claims to preserve these.

I'm skeptical that this is the actual problem behind PR8954, but
this is a stab in the right direction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123222 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-01-11 08:13:40 +00:00
parent b298db7253
commit b5b7997fd0
3 changed files with 23 additions and 7 deletions
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4
lib/Transforms/Scalar/GVN.cpp
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@@ -1741,8 +1741,8 @@ bool GVN::runOnFunction(Function& F) {
// Merge unconditional branches, allowing PRE to catch more
// optimization opportunities.
for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ) {
BasicBlock *BB = FI;
++FI;
BasicBlock *BB = FI++;
bool removedBlock = MergeBlockIntoPredecessor(BB, this);
if (removedBlock) ++NumGVNBlocks;