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SLPVectorize: Replace the code that checks for vectorization candidates in successor blocks with code that scans PHINodes.

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Before we could vectorize PHINodes scanning successors was a good way of finding candidates. Now we can vectorize the phinodes which is simpler.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186139 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2013-07-12 00:04:18 +00:00
parent 2c3c7fd696
commit 931b861e3d
2 changed files with 96 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Transforms/Vectorize/SLPVectorizer.cpp
+22 -25
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@@ -1550,8 +1550,7 @@ private:
/// \brief Try to vectorize a chain that starts at two arithmetic instrs.
bool tryToVectorizePair(Value *A, Value *B, BoUpSLP &R);
/// \brief Try to vectorize a list of operands. If \p NeedExtracts is true
/// then we calculate the cost of extracting the scalars from the vector.
/// \brief Try to vectorize a list of operands.
/// \returns true if a value was vectorized.
bool tryToVectorizeList(ArrayRef<Value *> VL, BoUpSLP &R);
@@ -1791,6 +1790,27 @@ bool SLPVectorizer::tryToVectorize(BinaryOperator *V, BoUpSLP &R) {
bool SLPVectorizer::vectorizeChainsInBlock(BasicBlock *BB, BoUpSLP &R) {
bool Changed = false;
SmallVector<Value *, 4> Incoming;
// Collect the incoming values from the PHIs.
for (BasicBlock::iterator instr = BB->begin(), ie = BB->end(); instr != ie;
++instr) {
PHINode *P = dyn_cast<PHINode>(instr);
if (!P)
break;
// Stop constructing the list when you reach a different type.
if (Incoming.size() && P->getType() != Incoming[0]->getType()) {
Changed |= tryToVectorizeList(Incoming, R);
Incoming.clear();
}
Incoming.push_back(P);
}
if (Incoming.size() > 1)
Changed |= tryToVectorizeList(Incoming, R);
for (BasicBlock::iterator it = BB->begin(), e = BB->end(); it != e; ++it) {
if (isa<DbgInfoIntrinsic>(it))
continue;
@@ -1831,29 +1851,6 @@ bool SLPVectorizer::vectorizeChainsInBlock(BasicBlock *BB, BoUpSLP &R) {
}
}
// Scan the PHINodes in our successors in search for pairing hints.
for (succ_iterator it = succ_begin(BB), e = succ_end(BB); it != e; ++it) {
BasicBlock *Succ = *it;
SmallVector<Value *, 4> Incoming;
// Collect the incoming values from the PHIs.
for (BasicBlock::iterator instr = Succ->begin(), ie = Succ->end();
instr != ie; ++instr) {
PHINode *P = dyn_cast<PHINode>(instr);
if (!P)
break;
Value *V = P->getIncomingValueForBlock(BB);
if (Instruction *I = dyn_cast<Instruction>(V))
if (I->getParent() == BB)
Incoming.push_back(I);
}
if (Incoming.size() > 1)
Changed |= tryToVectorizeList(Incoming, R);
}
return Changed;
}