diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMIntrinsicOps.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMIntrinsicOps.td
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMIntrinsicOps.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMIntrinsicOps.td
@@ -57,6 +57,7 @@
                    LLVM_Type:$cache);
 }
 def LLVM_SinOp : LLVM_UnaryIntrinsicOp<"sin">;
+def LLVM_RoundOp : LLVM_UnaryIntrinsicOp<"round">;
 def LLVM_SqrtOp : LLVM_UnaryIntrinsicOp<"sqrt">;
 def LLVM_PowOp : LLVM_BinarySameArgsIntrinsicOp<"pow">;
 def LLVM_PowIOp : LLVM_BinaryIntrinsicOp<"powi">;
diff --git a/mlir/test/Dialect/LLVMIR/roundtrip.mlir b/mlir/test/Dialect/LLVMIR/roundtrip.mlir
--- a/mlir/test/Dialect/LLVMIR/roundtrip.mlir
+++ b/mlir/test/Dialect/LLVMIR/roundtrip.mlir
@@ -155,6 +155,9 @@
 // CHECK: "llvm.intr.ctpop"(%{{.*}}) : (i32) -> i32
   %33 = "llvm.intr.ctpop"(%arg0) : (i32) -> i32
 
+// CHECK: "llvm.intr.round"(%[[FLOAT]]) : (f32) -> f32
+  %34 = "llvm.intr.round"(%arg1) : (f32) -> f32
+
 // CHECK: "llvm.intr.memcpy"(%{{.*}}, %{{.*}}, %{{.*}}, %{{.*}}) : (!llvm.ptr<i8>, !llvm.ptr<i8>, i32, i1) -> ()
   "llvm.intr.memcpy"(%arg2, %arg3, %arg0, %arg4) : (!llvm.ptr<i8>, !llvm.ptr<i8>, i32, i1) -> ()