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
@@ -44,6 +44,11 @@
   let arguments = (ins LLVM_Type:$in, I1:$is_int_min_poison);
 }
 
+def LLVM_IsFPClass : LLVM_OneResultIntrOp<"is.fpclass", [], [0],
+                                          [NoSideEffect]> {
+  let arguments = (ins LLVM_Type:$in, I32:$bit);
+}
+
 def LLVM_CopySignOp : LLVM_BinarySameArgsIntrinsicOp<"copysign">;
 def LLVM_CosOp : LLVM_UnaryIntrinsicOp<"cos">;
 def LLVM_ExpOp : LLVM_UnaryIntrinsicOp<"exp">;
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
@@ -18,6 +18,14 @@
   llvm.return
 }
 
+// CHECK-LABEL: @fpclass_test
+llvm.func @fpclass_test(%arg0: f32) -> i1 {
+  %checkNan = llvm.mlir.constant(0 : i32) : i32
+  // CHECK: call i1 @llvm.is.fpclass
+  %0 = "llvm.intr.is.fpclass"(%arg0, %checkNan) : (f32, i32) -> i1
+  llvm.return %0 : i1
+}
+
 // CHECK-LABEL: @exp_test
 llvm.func @exp_test(%arg0: f32, %arg1: vector<8xf32>) {
   // CHECK: call float @llvm.exp.f32