vendor/llvm/llvm-trunk-r321017

1 files changed, 18 insertions, 11 deletions

diff --git a/include/llvm/Analysis/MemoryLocation.h b/include/llvm/Analysis/MemoryLocation.h
index f2cb2a123f2e4..c1080742e83a2 100644
--- a/include/llvm/Analysis/MemoryLocation.h
+++ b/include/llvm/Analysis/MemoryLocation.h
@@ -16,6 +16,7 @@
 #ifndef LLVM_ANALYSIS_MEMORYLOCATION_H
 #define LLVM_ANALYSIS_MEMORYLOCATION_H
 
+#include "llvm/ADT/Optional.h"
 #include "llvm/ADT/DenseMapInfo.h"
 #include "llvm/IR/CallSite.h"
 #include "llvm/IR/Metadata.h"
@@ -68,17 +69,23 @@ public:
   static MemoryLocation get(const AtomicCmpXchgInst *CXI);
   static MemoryLocation get(const AtomicRMWInst *RMWI);
   static MemoryLocation get(const Instruction *Inst) {
-    if (auto *I = dyn_cast<LoadInst>(Inst))
-      return get(I);
-    else if (auto *I = dyn_cast<StoreInst>(Inst))
-      return get(I);
-    else if (auto *I = dyn_cast<VAArgInst>(Inst))
-      return get(I);
-    else if (auto *I = dyn_cast<AtomicCmpXchgInst>(Inst))
-      return get(I);
-    else if (auto *I = dyn_cast<AtomicRMWInst>(Inst))
-      return get(I);
-    llvm_unreachable("unsupported memory instruction");
+    return *MemoryLocation::getOrNone(Inst);
+  }
+  static Optional<MemoryLocation> getOrNone(const Instruction *Inst) {
+    switch (Inst->getOpcode()) {
+    case Instruction::Load:
+      return get(cast<LoadInst>(Inst));
+    case Instruction::Store:
+      return get(cast<StoreInst>(Inst));
+    case Instruction::VAArg:
+      return get(cast<VAArgInst>(Inst));
+    case Instruction::AtomicCmpXchg:
+      return get(cast<AtomicCmpXchgInst>(Inst));
+    case Instruction::AtomicRMW:
+      return get(cast<AtomicRMWInst>(Inst));
+    default:
+      return None;
+    }
   }
 
   /// Return a location representing the source of a memory transfer.