Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/lib/Analysis/PtrUseVisitor.cpp

@@ -0,0 +1,39 @@
+//===- PtrUseVisitor.cpp - InstVisitors over a pointers uses --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// Implementation of the pointer use visitors.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/PtrUseVisitor.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/IR/Instructions.h"
+#include <algorithm>
+
+using namespace llvm;
+
+void detail::PtrUseVisitorBase::enqueueUsers(Instruction &I) {
+  for (Use &U : I.uses()) {
+    if (VisitedUses.insert(&U).second) {
+      UseToVisit NewU = {
+        UseToVisit::UseAndIsOffsetKnownPair(&U, IsOffsetKnown),
+        Offset
+      };
+      Worklist.push_back(std::move(NewU));
+    }
+  }
+}
+
+bool detail::PtrUseVisitorBase::adjustOffsetForGEP(GetElementPtrInst &GEPI) {
+  if (!IsOffsetKnown)
+    return false;
+
+  return GEPI.accumulateConstantOffset(DL, Offset);
+}