vendor/llvm/llvm-trunk-r300422

1 files changed, 18 insertions, 6 deletions

diff --git a/lib/Analysis/LoopInfo.cpp b/lib/Analysis/LoopInfo.cpp
index f449ce94d57c..ff68810abb82 100644
--- a/lib/Analysis/LoopInfo.cpp
+++ b/lib/Analysis/LoopInfo.cpp
@@ -40,9 +40,9 @@ template class llvm::LoopInfoBase<BasicBlock, Loop>;
 
 // Always verify loopinfo if expensive checking is enabled.
 #ifdef EXPENSIVE_CHECKS
-static bool VerifyLoopInfo = true;
+bool llvm::VerifyLoopInfo = true;
 #else
-static bool VerifyLoopInfo = false;
+bool llvm::VerifyLoopInfo = false;
 #endif
 static cl::opt<bool,true>
 VerifyLoopInfoX("verify-loop-info", cl::location(VerifyLoopInfo),
@@ -211,9 +211,11 @@ bool Loop::isSafeToClone() const {
 
 MDNode *Loop::getLoopID() const {
   MDNode *LoopID = nullptr;
-  if (isLoopSimplifyForm()) {
-    LoopID = getLoopLatch()->getTerminator()->getMetadata(LLVMContext::MD_loop);
+  if (BasicBlock *Latch = getLoopLatch()) {
+    LoopID = Latch->getTerminator()->getMetadata(LLVMContext::MD_loop);
   } else {
+    assert(!getLoopLatch() &&
+           "The loop should have no single latch at this point");
     // Go through each predecessor of the loop header and check the
     // terminator for the metadata.
     BasicBlock *H = getHeader();
@@ -248,11 +250,12 @@ void Loop::setLoopID(MDNode *LoopID) const {
   assert(LoopID->getNumOperands() > 0 && "Loop ID needs at least one operand");
   assert(LoopID->getOperand(0) == LoopID && "Loop ID should refer to itself");
 
-  if (isLoopSimplifyForm()) {
-    getLoopLatch()->getTerminator()->setMetadata(LLVMContext::MD_loop, LoopID);
+  if (BasicBlock *Latch = getLoopLatch()) {
+    Latch->getTerminator()->setMetadata(LLVMContext::MD_loop, LoopID);
     return;
   }
 
+  assert(!getLoopLatch() && "The loop should have no single latch at this point");
   BasicBlock *H = getHeader();
   for (BasicBlock *BB : this->blocks()) {
     TerminatorInst *TI = BB->getTerminator();
@@ -610,6 +613,15 @@ LoopInfo::LoopInfo(const DominatorTreeBase<BasicBlock> &DomTree) {
   analyze(DomTree);
 }
 
+bool LoopInfo::invalidate(Function &F, const PreservedAnalyses &PA,
+                          FunctionAnalysisManager::Invalidator &) {
+  // Check whether the analysis, all analyses on functions, or the function's
+  // CFG have been preserved.
+  auto PAC = PA.getChecker<LoopAnalysis>();
+  return !(PAC.preserved() || PAC.preservedSet<AllAnalysesOn<Function>>() ||
+           PAC.preservedSet<CFGAnalyses>());
+}
+
 void LoopInfo::markAsRemoved(Loop *Unloop) {
   assert(!Unloop->isInvalid() && "Loop has already been removed");
   Unloop->invalidate();