diff --git a/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td b/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
--- a/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
+++ b/mlir/include/mlir/Dialect/StandardOps/IR/Ops.td
@@ -1544,6 +1544,26 @@
 }
 
 //===----------------------------------------------------------------------===//
+// FPToSIOp
+//===----------------------------------------------------------------------===//
+
+def FPToSIOp : CastOp<"fptosi">, Arguments<(ins AnyType:$in)> {
+  let summary = "cast from floating-point type to integer type";
+  let description = [{
+    Cast from a value interpreted as floating-point to the nearest (rounding
+    towards zero) signed integer value.
+  }];
+
+  let extraClassDeclaration = [{
+    /// Return true if `a` and `b` are valid operand and result pairs for
+    /// the operation.
+    static bool areCastCompatible(Type a, Type b);
+  }];
+
+  let hasFolder = 0;
+}
+
+//===----------------------------------------------------------------------===//
 // FPTruncOp
 //===----------------------------------------------------------------------===//
 
diff --git a/mlir/lib/Dialect/StandardOps/IR/Ops.cpp b/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
--- a/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
+++ b/mlir/lib/Dialect/StandardOps/IR/Ops.cpp
@@ -1662,6 +1662,14 @@
 }
 
 //===----------------------------------------------------------------------===//
+// FPToSIOp
+//===----------------------------------------------------------------------===//
+
+bool FPToSIOp::areCastCompatible(Type a, Type b) {
+  return a.isa<FloatType>() && b.isSignlessInteger();
+}
+
+//===----------------------------------------------------------------------===//
 // FPTruncOp
 //===----------------------------------------------------------------------===//
 
diff --git a/mlir/test/IR/core-ops.mlir b/mlir/test/IR/core-ops.mlir
--- a/mlir/test/IR/core-ops.mlir
+++ b/mlir/test/IR/core-ops.mlir
@@ -545,6 +545,18 @@
   // CHECK: %{{[0-9]+}} = sin %arg0 : tensor<4x4x?xf32>
   %149 = sin %t : tensor<4x4x?xf32>
 
+  // CHECK: = fptosi {{.*}} : f32 to i32
+  %159 = fptosi %f : f32 to i32
+
+  // CHECK: = fptosi {{.*}} : f32 to i64
+  %160 = fptosi %f : f32 to i64
+
+  // CHECK: = fptosi {{.*}} : f16 to i32
+  %161 = fptosi %half : f16 to i32
+
+  // CHECK: = fptosi {{.*}} : f16 to i64
+  %162 = fptosi %half : f16 to i64
+
   return
 }