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Only insert into definingblocks once per block

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llvm-svn: 260013
This commit is contained in:
Daniel Berlin 2016-02-07 01:52:15 +00:00
parent c7e8ed93d3
commit 3546e6c894
1 changed files with 4 additions and 1 deletions
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5
lib/Transforms/Utils/MemorySSA.cpp
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@ -253,17 +253,20 @@ MemorySSAWalker *MemorySSA::buildMemorySSA(AliasAnalysis *AA,
// Go through each block, figure out where defs occur, and chain together all
// the accesses.
for (BasicBlock &B : F) {
bool InsertIntoDef = false;
AccessListType *Accesses = nullptr;
for (Instruction &I : B) {
MemoryAccess *MA = createNewAccess(&I, true);
if (!MA)
continue;
if (isa<MemoryDef>(MA))
DefiningBlocks.insert(&B);
InsertIntoDef = true;
if (!Accesses)
Accesses = getOrCreateAccessList(&B);
Accesses->push_back(MA);
}
if (InsertIntoDef)
DefiningBlocks.insert(&B);
}
// Determine where our MemoryPhi's should go