[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges.
Summary: This patch introduces two new iterator ranges and updates existing code to use it. No functional change intended.
Test Plan: All tests (make check-all) still pass.
Reviewers: dblaikie
Reviewed By: dblaikie
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D4481
llvm-svn: 213474
diff --git a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
index 3af8ee7..51e0bc2 100644
--- a/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/DeadStoreElimination.cpp
@@ -642,8 +642,7 @@
/// them to F.
static void FindUnconditionalPreds(SmallVectorImpl<BasicBlock *> &Blocks,
BasicBlock *BB, DominatorTree *DT) {
- for (pred_iterator I = pred_begin(BB), E = pred_end(BB); I != E; ++I) {
- BasicBlock *Pred = *I;
+ for (BasicBlock *Pred : predecessors(BB)) {
if (Pred == BB) continue;
TerminatorInst *PredTI = Pred->getTerminator();
if (PredTI->getNumSuccessors() != 1)
diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp
index 106eba0..3ed7e3e 100644
--- a/llvm/lib/Transforms/Scalar/GVN.cpp
+++ b/llvm/lib/Transforms/Scalar/GVN.cpp
@@ -1555,9 +1555,7 @@
FullyAvailableBlocks[UnavailableBlocks[i]] = false;
SmallVector<BasicBlock *, 4> CriticalEdgePred;
- for (pred_iterator PI = pred_begin(LoadBB), E = pred_end(LoadBB);
- PI != E; ++PI) {
- BasicBlock *Pred = *PI;
+ for (BasicBlock *Pred : predecessors(LoadBB)) {
if (IsValueFullyAvailableInBlock(Pred, FullyAvailableBlocks, 0)) {
continue;
}
@@ -2483,9 +2481,7 @@
BasicBlock *PREPred = nullptr;
predMap.clear();
- for (pred_iterator PI = pred_begin(CurrentBlock),
- PE = pred_end(CurrentBlock); PI != PE; ++PI) {
- BasicBlock *P = *PI;
+ for (BasicBlock *P : predecessors(CurrentBlock)) {
// We're not interested in PRE where the block is its
// own predecessor, or in blocks with predecessors
// that are not reachable.
@@ -2713,14 +2709,13 @@
for (SmallVectorImpl<BasicBlock *>::iterator I = Dom.begin(),
E = Dom.end(); I != E; I++) {
BasicBlock *B = *I;
- for (succ_iterator SI = succ_begin(B), SE = succ_end(B); SI != SE; SI++) {
- BasicBlock *S = *SI;
+ for (BasicBlock *S : successors(B)) {
if (DeadBlocks.count(S))
continue;
bool AllPredDead = true;
- for (pred_iterator PI = pred_begin(S), PE = pred_end(S); PI != PE; PI++)
- if (!DeadBlocks.count(*PI)) {
+ for (BasicBlock *Pred : predecessors(S))
+ if (!DeadBlocks.count(Pred)) {
AllPredDead = false;
break;
}
diff --git a/llvm/lib/Transforms/Scalar/JumpThreading.cpp b/llvm/lib/Transforms/Scalar/JumpThreading.cpp
index 21f8038..d9b6d56 100644
--- a/llvm/lib/Transforms/Scalar/JumpThreading.cpp
+++ b/llvm/lib/Transforms/Scalar/JumpThreading.cpp
@@ -353,8 +353,8 @@
// If V is a constant, then it is known in all predecessors.
if (Constant *KC = getKnownConstant(V, Preference)) {
- for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
- Result.push_back(std::make_pair(KC, *PI));
+ for (BasicBlock *Pred : predecessors(BB))
+ Result.push_back(std::make_pair(KC, Pred));
return true;
}
@@ -377,8 +377,7 @@
// "X < 4" and "X < 3" is known true but "X < 4" itself is not available.
// Perhaps getConstantOnEdge should be smart enough to do this?
- for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) {
- BasicBlock *P = *PI;
+ for (BasicBlock *P : predecessors(BB)) {
// If the value is known by LazyValueInfo to be a constant in a
// predecessor, use that information to try to thread this block.
Constant *PredCst = LVI->getConstantOnEdge(V, P, BB);
@@ -532,8 +531,7 @@
cast<Instruction>(Cmp->getOperand(0))->getParent() != BB) {
Constant *RHSCst = cast<Constant>(Cmp->getOperand(1));
- for (pred_iterator PI = pred_begin(BB), E = pred_end(BB);PI != E; ++PI){
- BasicBlock *P = *PI;
+ for (BasicBlock *P : predecessors(BB)) {
// If the value is known by LazyValueInfo to be a constant in a
// predecessor, use that information to try to thread this block.
LazyValueInfo::Tristate Res =
@@ -606,8 +604,8 @@
// If all else fails, see if LVI can figure out a constant value for us.
Constant *CI = LVI->getConstant(V, BB);
if (Constant *KC = getKnownConstant(CI, Preference)) {
- for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI)
- Result.push_back(std::make_pair(KC, *PI));
+ for (BasicBlock *Pred : predecessors(BB))
+ Result.push_back(std::make_pair(KC, Pred));
}
return !Result.empty();
@@ -899,10 +897,7 @@
// If we got here, the loaded value is transparent through to the start of the
// block. Check to see if it is available in any of the predecessor blocks.
- for (pred_iterator PI = pred_begin(LoadBB), PE = pred_end(LoadBB);
- PI != PE; ++PI) {
- BasicBlock *PredBB = *PI;
-
+ for (BasicBlock *PredBB : predecessors(LoadBB)) {
// If we already scanned this predecessor, skip it.
if (!PredsScanned.insert(PredBB))
continue;
@@ -952,9 +947,7 @@
AvailablePredSet.insert(AvailablePreds[i].first);
// Add all the unavailable predecessors to the PredsToSplit list.
- for (pred_iterator PI = pred_begin(LoadBB), PE = pred_end(LoadBB);
- PI != PE; ++PI) {
- BasicBlock *P = *PI;
+ for (BasicBlock *P : predecessors(LoadBB)) {
// If the predecessor is an indirect goto, we can't split the edge.
if (isa<IndirectBrInst>(P->getTerminator()))
return false;
diff --git a/llvm/lib/Transforms/Scalar/LoopInstSimplify.cpp b/llvm/lib/Transforms/Scalar/LoopInstSimplify.cpp
index ab1a939..657038e 100644
--- a/llvm/lib/Transforms/Scalar/LoopInstSimplify.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopInstSimplify.cpp
@@ -145,9 +145,7 @@
// bodies of subloops. We visit the headers of loops so that we can process
// their phis, but we contract the rest of the subloop body and only follow
// edges leading back to the original loop.
- for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB); SI != SE;
- ++SI) {
- BasicBlock *SuccBB = *SI;
+ for (BasicBlock *SuccBB : successors(BB)) {
if (!Visited.insert(SuccBB))
continue;
diff --git a/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp b/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp
index 977c53a..68bd4b8 100644
--- a/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopUnswitch.cpp
@@ -515,9 +515,9 @@
}
// Otherwise, this is an unvisited intra-loop node. Check all successors.
- for (succ_iterator SI = succ_begin(BB), E = succ_end(BB); SI != E; ++SI) {
+ for (BasicBlock *Succ : successors(BB)) {
// Check to see if the successor is a trivial loop exit.
- if (!isTrivialLoopExitBlockHelper(L, *SI, ExitBB, Visited))
+ if (!isTrivialLoopExitBlockHelper(L, Succ, ExitBB, Visited))
return false;
}
@@ -861,9 +861,7 @@
PHINode *PN = PHINode::Create(LPad->getType(), 0, "",
ExitSucc->getFirstInsertionPt());
- for (pred_iterator I = pred_begin(ExitSucc), E = pred_end(ExitSucc);
- I != E; ++I) {
- BasicBlock *BB = *I;
+ for (BasicBlock *BB : predecessors(ExitSucc)) {
LandingPadInst *LPI = BB->getLandingPadInst();
LPI->replaceAllUsesWith(PN);
PN->addIncoming(LPI, BB);
diff --git a/llvm/lib/Transforms/Scalar/SampleProfile.cpp b/llvm/lib/Transforms/Scalar/SampleProfile.cpp
index 73c97ff..8e3583a 100644
--- a/llvm/lib/Transforms/Scalar/SampleProfile.cpp
+++ b/llvm/lib/Transforms/Scalar/SampleProfile.cpp
@@ -865,8 +865,7 @@
SmallPtrSet<BasicBlock *, 16> Visited;
if (!Predecessors[B1].empty())
llvm_unreachable("Found a stale predecessors list in a basic block.");
- for (pred_iterator PI = pred_begin(B1), PE = pred_end(B1); PI != PE; ++PI) {
- BasicBlock *B2 = *PI;
+ for (BasicBlock *B2 : predecessors(B1)) {
if (Visited.insert(B2))
Predecessors[B1].push_back(B2);
}
@@ -875,8 +874,7 @@
Visited.clear();
if (!Successors[B1].empty())
llvm_unreachable("Found a stale successors list in a basic block.");
- for (succ_iterator SI = succ_begin(B1), SE = succ_end(B1); SI != SE; ++SI) {
- BasicBlock *B2 = *SI;
+ for (BasicBlock *B2 : successors(B1)) {
if (Visited.insert(B2))
Successors[B1].push_back(B2);
}
diff --git a/llvm/lib/Transforms/Scalar/Sink.cpp b/llvm/lib/Transforms/Scalar/Sink.cpp
index 7348c45..2f7a9f9 100644
--- a/llvm/lib/Transforms/Scalar/Sink.cpp
+++ b/llvm/lib/Transforms/Scalar/Sink.cpp
@@ -258,10 +258,11 @@
// If no suitable postdominator was found, look at all the successors and
// decide which one we should sink to, if any.
- for (succ_iterator I = succ_begin(Inst->getParent()),
- E = succ_end(Inst->getParent()); I != E && !SuccToSinkTo; ++I) {
- if (IsAcceptableTarget(Inst, *I))
- SuccToSinkTo = *I;
+ for (BasicBlock *Succ : successors(Inst->getParent())) {
+ if (SuccToSinkTo)
+ break;
+ if (IsAcceptableTarget(Inst, Succ))
+ SuccToSinkTo = Succ;
}
// If we couldn't find a block to sink to, ignore this instruction.
diff --git a/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp b/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
index b9673ed..d2206e3 100644
--- a/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
+++ b/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
@@ -365,41 +365,39 @@
BBPredicates &Pred = Predicates[BB];
BBPredicates &LPred = LoopPreds[BB];
- for (pred_iterator PI = pred_begin(BB), PE = pred_end(BB);
- PI != PE; ++PI) {
-
+ for (BasicBlock *Predecessor : predecessors(BB)) {
// Ignore it if it's a branch from outside into our region entry
- if (!ParentRegion->contains(*PI))
+ if (!ParentRegion->contains(Predecessor))
continue;
- Region *R = RI->getRegionFor(*PI);
+ Region *R = RI->getRegionFor(Predecessor);
if (R == ParentRegion) {
// It's a top level block in our region
- BranchInst *Term = cast<BranchInst>((*PI)->getTerminator());
+ BranchInst *Term = cast<BranchInst>(Predecessor->getTerminator());
for (unsigned i = 0, e = Term->getNumSuccessors(); i != e; ++i) {
BasicBlock *Succ = Term->getSuccessor(i);
if (Succ != BB)
continue;
- if (Visited.count(*PI)) {
+ if (Visited.count(Predecessor)) {
// Normal forward edge
if (Term->isConditional()) {
// Try to treat it like an ELSE block
BasicBlock *Other = Term->getSuccessor(!i);
if (Visited.count(Other) && !Loops.count(Other) &&
- !Pred.count(Other) && !Pred.count(*PI)) {
+ !Pred.count(Other) && !Pred.count(Predecessor)) {
Pred[Other] = BoolFalse;
- Pred[*PI] = BoolTrue;
+ Pred[Predecessor] = BoolTrue;
continue;
}
}
- Pred[*PI] = buildCondition(Term, i, false);
+ Pred[Predecessor] = buildCondition(Term, i, false);
} else {
// Back edge
- LPred[*PI] = buildCondition(Term, i, true);
+ LPred[Predecessor] = buildCondition(Term, i, true);
}
}
@@ -574,11 +572,8 @@
if (!Term)
return;
- for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB);
- SI != SE; ++SI) {
-
- delPhiValues(BB, *SI);
- }
+ for (BasicBlock *Succ : successors(BB))
+ delPhiValues(BB, Succ);
Term->eraseFromParent();
}
@@ -592,10 +587,7 @@
BasicBlock *Dominator = nullptr;
// Find all the edges from the sub region to the exit
- for (pred_iterator I = pred_begin(OldExit), E = pred_end(OldExit);
- I != E;) {
-
- BasicBlock *BB = *I++;
+ for (BasicBlock *BB : predecessors(OldExit)) {
if (!SubRegion->contains(BB))
continue;
diff --git a/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp b/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
index 05b9892..d9280ac6 100644
--- a/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
@@ -335,7 +335,7 @@
}
}
- for (auto *SuccBB : make_range(succ_begin(BB), succ_end(BB))) {
+ for (auto *SuccBB : successors(BB)) {
auto &State = Visited[SuccBB];
if (State < Escaped) {
State = Escaped;
@@ -807,8 +807,7 @@
// predecessors and perform TRC there. Look for predecessors that end
// in unconditional branch and recursive call(s).
SmallVector<BranchInst*, 8> UncondBranchPreds;
- for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) {
- BasicBlock *Pred = *PI;
+ for (BasicBlock *Pred : predecessors(BB)) {
TerminatorInst *PTI = Pred->getTerminator();
if (BranchInst *BI = dyn_cast<BranchInst>(PTI))
if (BI->isUnconditional())