1 files changed, 16 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/LoopAccessAnalysis.cpp b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
index 8a779ac..245cce2 100644
--- a/llvm/lib/Analysis/LoopAccessAnalysis.cpp
+++ b/llvm/lib/Analysis/LoopAccessAnalysis.cpp
@@ -942,6 +942,22 @@ static void findForkedSCEVs(
       ScevList.emplace_back(Scev, !isGuaranteedNotToBeUndefOrPoison(Ptr));
     break;
   }
+  case Instruction::PHI: {
+    SmallVector<PointerIntPair<const SCEV *, 1, bool>, 2> ChildScevs;
+    // A phi means we've found a forked pointer, but we currently only
+    // support a single phi per pointer so if there's another behind this
+    // then we just bail out and return the generic SCEV.
+    if (I->getNumOperands() == 2) {
+      findForkedSCEVs(SE, L, I->getOperand(0), ChildScevs, Depth);
+      findForkedSCEVs(SE, L, I->getOperand(1), ChildScevs, Depth);
+    }
+    if (ChildScevs.size() == 2) {
+      ScevList.push_back(ChildScevs[0]);
+      ScevList.push_back(ChildScevs[1]);
+    } else
+      ScevList.emplace_back(Scev, !isGuaranteedNotToBeUndefOrPoison(Ptr));
+    break;
+  }
   case Instruction::Add:
   case Instruction::Sub: {
     SmallVector<PointerIntPair<const SCEV *, 1, bool>> LScevs;