diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
@@ -1447,6 +1447,10 @@
   let arguments = (ins LLVM_Type:$dst, LLVM_Type:$src, LLVM_Type:$len,
                    LLVM_Type:$isVolatile);
 }
+def LLVM_MemmoveOp : LLVM_ZeroResultIntrOp<"memmove", [0, 1, 2]> {
+  let arguments = (ins LLVM_Type:$dst, LLVM_Type:$src, LLVM_Type:$len,
+                   LLVM_Type:$isVolatile);
+}
 
 def LLVM_MemsetOp : LLVM_ZeroResultIntrOp<"memset", [0, 2]> {
   let arguments = (ins LLVM_Type:$dst, LLVM_Type:$val, LLVM_Type:$len,
diff --git a/mlir/test/Target/LLVMIR/llvmir-intrinsics.mlir b/mlir/test/Target/LLVMIR/llvmir-intrinsics.mlir
--- a/mlir/test/Target/LLVMIR/llvmir-intrinsics.mlir
+++ b/mlir/test/Target/LLVMIR/llvmir-intrinsics.mlir
@@ -350,6 +350,14 @@
   llvm.return
 }
 
+// CHECK-LABEL: @memmove_test
+llvm.func @memmove_test(%arg0: i32, %arg2: !llvm.ptr<i8>, %arg3: !llvm.ptr<i8>) {
+  %i1 = llvm.mlir.constant(false) : i1
+  // CHECK: call void @llvm.memmove.p0i8.p0i8.i32(i8* %{{.*}}, i8* %{{.*}}, i32 %{{.*}}, i1 {{.*}})
+  "llvm.intr.memmove"(%arg2, %arg3, %arg0, %i1) : (!llvm.ptr<i8>, !llvm.ptr<i8>, i32, i1) -> ()
+  llvm.return
+}
+
 // CHECK-LABEL: @memset_test
 llvm.func @memset_test(%arg0: i32, %arg2: !llvm.ptr<i8>, %arg3: i8) {
   %i1 = llvm.mlir.constant(false) : i1