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SLPVectorizer: change the order in which we search for vectorization candidates. Do stores first and PHIs second.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186277 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-07-14 06:15:46 +00:00
parent 83d63f8a4d
commit 6611eaa32f
1 changed files with 4 additions and 4 deletions
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8
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -1522,15 +1522,15 @@ struct SLPVectorizer : public FunctionPass {
e = po_end(&F.getEntryBlock()); it != e; ++it) { e = po_end(&F.getEntryBlock()); it != e; ++it) {
BasicBlock *BB = *it; BasicBlock *BB = *it;
// Vectorize trees that end at reductions.
Changed |= vectorizeChainsInBlock(BB, R);
// Vectorize trees that end at stores. // Vectorize trees that end at stores.
if (unsigned count = collectStores(BB, R)) { if (unsigned count = collectStores(BB, R)) {
(void)count; (void)count;
DEBUG(dbgs() << "SLP: Found " << count << " stores to vectorize.\n"); DEBUG(dbgs() << "SLP: Found " << count << " stores to vectorize.\n");
Changed |= vectorizeStoreChains(R); Changed |= vectorizeStoreChains(R);
} }
// Vectorize trees that end at reductions.
Changed |= vectorizeChainsInBlock(BB, R);
} }
if (Changed) { if (Changed) {
@ -1653,7 +1653,7 @@ bool SLPVectorizer::vectorizeStores(ArrayRef<StoreInst *> Stores,
bool Changed = false; bool Changed = false;
// Do a quadratic search on all of the given stores and find // Do a quadratic search on all of the given stores and find
// all of the pairs of loads that follow each other. // all of the pairs of stores that follow each other.
for (unsigned i = 0, e = Stores.size(); i < e; ++i) for (unsigned i = 0, e = Stores.size(); i < e; ++i)
for (unsigned j = 0; j < e; ++j) { for (unsigned j = 0; j < e; ++j) {
if (i == j) if (i == j)