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[LoopVectorizer] Move some code around to ease further refactoring. NFCI.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241739 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Zolotukhin 2015-07-08 21:47:53 +00:00
parent a8e8640a65
commit ca6e363f1d
1 changed files with 13 additions and 16 deletions
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29
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -2615,6 +2615,19 @@ void InnerLoopVectorizer::createEmptyLoop() {
// times the unroll factor (num of SIMD instructions).
Constant *Step = ConstantInt::get(IdxTy, VF * UF);
// Generate code to check that the loop's trip count that we computed by
// adding one to the backedge-taken count will not overflow.
auto PastOverflowCheck = std::next(BasicBlock::iterator(OverflowCheckAnchor));
BasicBlock *CheckBlock =
BypassBlock->splitBasicBlock(PastOverflowCheck, "overflow.checked");
if (ParentLoop)
ParentLoop->addBasicBlockToLoop(CheckBlock, *LI);
LoopBypassBlocks.push_back(CheckBlock);
ReplaceInstWithInst(
BypassBlock->getTerminator(),
BranchInst::Create(ScalarPH, CheckBlock, CheckBCOverflow));
BypassBlock = CheckBlock;
// This is the IR builder that we use to add all of the logic for bypassing
// the new vector loop.
IRBuilder<> BypassBuilder(BypassBlock->getTerminator());
@ -2647,22 +2660,6 @@ void InnerLoopVectorizer::createEmptyLoop() {
Value *Cmp =
BypassBuilder.CreateICmpEQ(IdxEndRoundDown, StartIdx, "cmp.zero");
// Generate code to check that the loops trip count that we computed by adding
// one to the backedge-taken count will not overflow.
{
auto PastOverflowCheck =
std::next(BasicBlock::iterator(OverflowCheckAnchor));
BasicBlock *CheckBlock =
BypassBlock->splitBasicBlock(PastOverflowCheck, "overflow.checked");
if (ParentLoop)
ParentLoop->addBasicBlockToLoop(CheckBlock, *LI);
LoopBypassBlocks.push_back(CheckBlock);
ReplaceInstWithInst(
BypassBlock->getTerminator(),
BranchInst::Create(ScalarPH, CheckBlock, CheckBCOverflow));
BypassBlock = CheckBlock;
}
// Generate the code to check that the strides we assumed to be one are really
// one. We want the new basic block to start at the first instruction in a
// sequence of instructions that form a check.