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[LoopIdiomRecognize] Replace more unchecked dyn_casts with cast.

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Two of these are immediately dereferenced on the next line. The other two are passed immediately to the IRBuilder constructor which can't handle a nullptr.

llvm-svn: 331500
This commit is contained in:
Craig Topper 2018-05-04 01:04:28 +00:00
parent cad41d3462
commit b8509ccc4e
1 changed files with 4 additions and 4 deletions
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8
lib/Transforms/Scalar/LoopIdiomRecognize.cpp
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@ -1539,7 +1539,7 @@ static CallInst *createCTLZIntrinsic(IRBuilder<> &IRBuilder, Value *Val,
void LoopIdiomRecognize::transformLoopToCountable(
BasicBlock *Preheader, Instruction *CntInst, PHINode *CntPhi, Value *InitX,
const DebugLoc DL, bool ZeroCheck, bool IsCntPhiUsedOutsideLoop) {
BranchInst *PreheaderBr = dyn_cast<BranchInst>(Preheader->getTerminator());
BranchInst *PreheaderBr = cast<BranchInst>(Preheader->getTerminator());
// Step 1: Insert the CTLZ instruction at the end of the preheader block
// Count = BitWidth - CTLZ(InitX);
@ -1587,7 +1587,7 @@ void LoopIdiomRecognize::transformLoopToCountable(
// ...
// Br: loop if (Dec != 0)
BasicBlock *Body = *(CurLoop->block_begin());
auto *LbBr = dyn_cast<BranchInst>(Body->getTerminator());
auto *LbBr = cast<BranchInst>(Body->getTerminator());
ICmpInst *LbCond = cast<ICmpInst>(LbBr->getCondition());
Type *Ty = Count->getType();
@ -1624,7 +1624,7 @@ void LoopIdiomRecognize::transformLoopToPopcount(BasicBlock *PreCondBB,
Instruction *CntInst,
PHINode *CntPhi, Value *Var) {
BasicBlock *PreHead = CurLoop->getLoopPreheader();
auto *PreCondBr = dyn_cast<BranchInst>(PreCondBB->getTerminator());
auto *PreCondBr = cast<BranchInst>(PreCondBB->getTerminator());
const DebugLoc DL = CntInst->getDebugLoc();
// Assuming before transformation, the loop is following:
@ -1695,7 +1695,7 @@ void LoopIdiomRecognize::transformLoopToPopcount(BasicBlock *PreCondBB,
// do { cnt++; x &= x-1; t--) } while (t > 0);
BasicBlock *Body = *(CurLoop->block_begin());
{
auto *LbBr = dyn_cast<BranchInst>(Body->getTerminator());
auto *LbBr = cast<BranchInst>(Body->getTerminator());
ICmpInst *LbCond = cast<ICmpInst>(LbBr->getCondition());
Type *Ty = TripCnt->getType();