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SLP: When searching for vectorization opportunities scan the blocks in post-order because we grow chains upwards.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185041 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-06-26 23:44:45 +00:00
parent 1e1c694dcd
commit 70d695801a
1 changed files with 4 additions and 2 deletions
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6
lib/Transforms/Vectorize/SLPVectorizer.cpp
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@ -1377,8 +1377,10 @@ struct SLPVectorizer : public FunctionPass {
// he store instructions.
FuncSLP R(&F, SE, DL, TTI, AA, LI, DT);
for (Function::iterator it = F.begin(), e = F.end(); it != e; ++it) {
BasicBlock *BB = it;
// Scan the blocks in the function in post order.
for (po_iterator<BasicBlock*> it = po_begin(&F.getEntryBlock()),
e = po_end(&F.getEntryBlock()); it != e; ++it) {
BasicBlock *BB = *it;
// Vectorize trees that end at reductions.
Changed |= vectorizeChainsInBlock(BB, R);