Vendor import of llvm trunk r290819:vendor/llvm/llvm-trunk-r290819

https://llvm.org/svn/llvm-project/llvm/trunk@290819

1 files changed, 22 insertions, 5 deletions

diff --git a/lib/Target/Hexagon/BitTracker.cpp b/lib/Target/Hexagon/BitTracker.cpp
index d052a835fbd8..c0591c332dea 100644
--- a/lib/Target/Hexagon/BitTracker.cpp
+++ b/lib/Target/Hexagon/BitTracker.cpp
@@ -169,6 +169,12 @@ namespace llvm {
   }
 }
 
+void BitTracker::print_cells(raw_ostream &OS) const {
+  for (CellMapType::iterator I = Map.begin(), E = Map.end(); I != E; ++I)
+    dbgs() << PrintReg(I->first, &ME.TRI) << " -> " << I->second << "\n";
+}
+
+
 BitTracker::BitTracker(const MachineEvaluator &E, MachineFunction &F)
     : Trace(false), ME(E), MF(F), MRI(F.getRegInfo()), Map(*new CellMapType) {}
 
@@ -1042,6 +1048,20 @@ bool BT::reached(const MachineBasicBlock *B) const {
 }
 
 
+// Visit an individual instruction. This could be a newly added instruction,
+// or one that has been modified by an optimization.
+void BT::visit(const MachineInstr &MI) {
+  assert(!MI.isBranch() && "Only non-branches are allowed");
+  InstrExec.insert(&MI);
+  visitNonBranch(MI);
+  // The call to visitNonBranch could propagate the changes until a branch
+  // is actually visited. This could result in adding CFG edges to the flow
+  // queue. Since the queue won't be processed, clear it.
+  while (!FlowQ.empty())
+    FlowQ.pop();
+}
+
+
 void BT::reset() {
   EdgeExec.clear();
   InstrExec.clear();
@@ -1118,10 +1138,7 @@ void BT::run() {
     }
   } // while (!FlowQ->empty())
 
-  if (Trace) {
-    dbgs() << "Cells after propagation:\n";
-    for (CellMapType::iterator I = Map.begin(), E = Map.end(); I != E; ++I)
-      dbgs() << PrintReg(I->first, &ME.TRI) << " -> " << I->second << "\n";
-  }
+  if (Trace)
+    print_cells(dbgs() << "Cells after propagation:\n");
 }