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use range-loops; NFCI 

llvm-svn: 265985
This commit is contained in:
Sanjay Patel 2016-04-11 20:13:44 +00:00
parent 6b3169bb97
commit 892f167aa5
1 changed files with 8 additions and 13 deletions
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21
llvm/lib/CodeGen/CodeGenPrepare.cpp
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@ -5368,43 +5368,38 @@ bool CodeGenPrepare::sinkAndCmp(Function &F) {
if (!TLI || !TLI->isMaskAndBranchFoldingLegal())
return false;
bool MadeChange = false;
for (Function::iterator I = F.begin(), E = F.end(); I != E; ) {
BasicBlock *BB = &*I++;
for (BasicBlock &BB : F) {
// Does this BB end with the following?
// %andVal = and %val, #single-bit-set
// %icmpVal = icmp %andResult, 0
// br i1 %cmpVal label %dest1, label %dest2"
BranchInst *Brcc = dyn_cast<BranchInst>(BB->getTerminator());
BranchInst *Brcc = dyn_cast<BranchInst>(BB.getTerminator());
if (!Brcc || !Brcc->isConditional())
continue;
ICmpInst *Cmp = dyn_cast<ICmpInst>(Brcc->getOperand(0));
if (!Cmp || Cmp->getParent() != BB)
if (!Cmp || Cmp->getParent() != &BB)
continue;
ConstantInt *Zero = dyn_cast<ConstantInt>(Cmp->getOperand(1));
if (!Zero || !Zero->isZero())
continue;
Instruction *And = dyn_cast<Instruction>(Cmp->getOperand(0));
if (!And || And->getOpcode() != Instruction::And || And->getParent() != BB)
if (!And || And->getOpcode() != Instruction::And || And->getParent() != &BB)
continue;
ConstantInt* Mask = dyn_cast<ConstantInt>(And->getOperand(1));
if (!Mask || !Mask->getUniqueInteger().isPowerOf2())
continue;
DEBUG(dbgs() << "found and; icmp ?,0; brcc\n"); DEBUG(BB->dump());
DEBUG(dbgs() << "found and; icmp ?,0; brcc\n"); DEBUG(BB.dump());
// Push the "and; icmp" for any users that are conditional branches.
// Since there can only be one branch use per BB, we don't need to keep
// track of which BBs we insert into.
for (Value::use_iterator UI = Cmp->use_begin(), E = Cmp->use_end();
UI != E; ) {
Use &TheUse = *UI;
for (Use &TheUse : Cmp->uses()) {
// Find brcc use.
BranchInst *BrccUser = dyn_cast<BranchInst>(*UI);
++UI;
BranchInst *BrccUser = dyn_cast<BranchInst>(TheUse);
if (!BrccUser || !BrccUser->isConditional())
continue;
BasicBlock *UserBB = BrccUser->getParent();
if (UserBB == BB) continue;
if (UserBB == &BB) continue;
DEBUG(dbgs() << "found Brcc use\n");
// Sink the "and; icmp" to use.