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[LV] Remove redundant basic block split 

This patch is part of D28975's breakdown.

Genreating the control-flow to guard predicated instructions modified to
only use SplitBlockAndInsertIfThen() for producing the if-then construct.

Differential Revision: https://reviews.llvm.org/D32224

llvm-svn: 301293
This commit is contained in:
Gil Rapaport 2017-04-25 05:57:22 +00:00
parent 376508ad8d
commit 860f0a2bad
1 changed files with 4 additions and 3 deletions
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7
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -4516,14 +4516,15 @@ void InnerLoopVectorizer::predicateInstructions() {
for (auto KV : PredicatedInstructions) {
BasicBlock::iterator I(KV.first);
BasicBlock *Head = I->getParent();
auto *BB = SplitBlock(Head, &*std::next(I), DT, LI);
auto *T = SplitBlockAndInsertIfThen(KV.second, &*I, /*Unreachable=*/false,
/*BranchWeights=*/nullptr, DT, LI);
I->moveBefore(T);
sinkScalarOperands(&*I);
I->getParent()->setName(Twine("pred.") + I->getOpcodeName() + ".if");
BB->setName(Twine("pred.") + I->getOpcodeName() + ".continue");
BasicBlock *PredicatedBlock = I->getParent();
Twine BBNamePrefix = Twine("pred.") + I->getOpcodeName();
PredicatedBlock->setName(BBNamePrefix + ".if");
PredicatedBlock->getSingleSuccessor()->setName(BBNamePrefix + ".continue");
// If the instruction is non-void create a Phi node at reconvergence point.
if (!I->getType()->isVoidTy()) {