Index: lib/Transforms/Utils/LoopRotationUtils.cpp
===================================================================
--- lib/Transforms/Utils/LoopRotationUtils.cpp
+++ lib/Transforms/Utils/LoopRotationUtils.cpp
@@ -332,6 +332,19 @@
       continue;
     }
 
+    // Duplicating lifetimes will create invalid lifetimes. Instead we can
+    // extend the lifetime of the memory location by hoisting the start to
+    // the loop entry and sinking ends to the loop exit.
+    if (auto *IntrInst = dyn_cast<IntrinsicInst>(Inst)) {
+      if (IntrInst->getIntrinsicID() == Intrinsic::lifetime_start) {
+        Inst->moveBefore(LoopEntryBranch);
+        continue;
+      } else if (IntrInst->getIntrinsicID() == Intrinsic::lifetime_end) {
+        Inst->moveBefore(Exit->getFirstNonPHI());
+        continue;
+      }
+    }
+
     // Otherwise, create a duplicate of the instruction.
     Instruction *C = Inst->clone();
 
Index: test/Transforms/LoopRotate/lifetimes.ll
===================================================================
--- /dev/null
+++ test/Transforms/LoopRotate/lifetimes.ll
@@ -0,0 +1,52 @@
+; RUN: opt -S -loop-rotate < %s -verify-loop-info -verify-dom-info | FileCheck %s
+
+; Make sure we extend lifetimes properly.
+
+; CHECK-LABEL: @test(
+; CHECK-LABEL: entry:
+; CHECK:         call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %tmp)
+
+; CHECK-LABEL: for.body.lr.ph:
+; CHECK-NOT:     call void @llvm.lifetime.start.p0i8
+; CHECK-NOT:     call void @llvm.lifetime.end.p0i8
+
+; CHECK-LABEL: return.loopexit:
+; CHECK-NEXT:    call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %tmp)
+
+define void @test(i32 %x) nounwind {
+entry:
+  %m = alloca i32, align 4
+  br label %for.cond
+
+for.cond:                                         ; preds = %if.end, %entry
+  %i.0 = phi i32 [ 0, %entry ], [ %inc, %if.end ]
+  %cmp = icmp eq i32 %i.0, %x
+  %tmp = bitcast i32* %m to i8*
+  call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %tmp)
+  store i32 1, i32* %m
+  call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %tmp)
+  br i1 %cmp, label %return.loopexit, label %for.body
+
+for.body:                                         ; preds = %for.cond
+  %call = tail call i32 @foo(i32 %i.0)
+  %tobool = icmp eq i32 %call, 0
+  br i1 %tobool, label %if.end, label %a
+
+if.end:                                           ; preds = %for.body
+  %inc = add i32 %i.0, 1
+  br label %for.cond
+
+a:                                                ; preds = %for.body
+  br label %return
+
+return.loopexit:                                  ; preds = %for.cond
+  br label %return
+
+return:                                           ; preds = %return.loopexit, %a
+  ret void
+}
+
+declare  void @llvm.lifetime.start.p0i8(i64, i8*)
+declare  void @llvm.lifetime.end.p0i8(i64, i8*)
+
+declare i32 @foo(i32)