Added hardtanh operator

backends/cadence/aot/functions_fusion_g3.yaml

@@ -171,6 +171,11 @@
   kernels:
     - arg_meta: null
       kernel_name: cadence::impl::G3::exp_out
+
+- op: hardtanh.out
+  kernels:
+    - arg_meta: null
+      kernel_name: cadence::impl::G3::hardtanh_out
 
 # custom ops
 - func: cadence::quantize_per_tensor.out(Tensor input, float scale, int zero_point, int quant_min, int quant_max, ScalarType dtype, *, Tensor(a!) out) -> Tensor(a!)

backends/cadence/fusion_g3/operators/CMakeLists.txt

@@ -50,6 +50,7 @@ set(_aten_ops__srcs
     "${CMAKE_CURRENT_SOURCE_DIR}/op_lt.cpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/op_where.cpp"
     "${CMAKE_CURRENT_SOURCE_DIR}/op_clamp.cpp"
+    "${CMAKE_CURRENT_SOURCE_DIR}/op_hardtanh.cpp"
     "${EXECUTORCH_ROOT}/kernels/portable/cpu/op_bmm.cpp"
     "${EXECUTORCH_ROOT}/kernels/portable/cpu/op_clone.cpp"
     "${EXECUTORCH_ROOT}/kernels/portable/cpu/op_div.cpp"

backends/cadence/fusion_g3/operators/op_hardtanh.cpp

@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+#include <executorch/backends/cadence/fusion_g3/operators/operators.h>
+
+#include <cmath>
+
+#include <xa_nnlib_kernels_api.h>
+
+#include <executorch/backends/cadence/fusion_g3/operators/xt_macros.h>
+#include <executorch/kernels/portable/cpu/scalar_utils.h>
+#include <executorch/kernels/portable/cpu/util/functional_util.h>
+#include <executorch/kernels/portable/cpu/util/math_util.h>
+#include <executorch/runtime/kernel/kernel_includes.h>
+
+using ::executorch::aten::Scalar;
+using ::executorch::aten::ScalarType;
+using ::executorch::aten::Tensor;
+using ::executorch::runtime::Error;
+using ::executorch::runtime::KernelRuntimeContext;
+using ::torch::executor::native::utils::extract_scalar;
+using ::torch::executor::native::utils::get_scalar_dtype;
+
+namespace cadence {
+namespace impl {
+namespace G3 {
+namespace native {
+
+Tensor& hardtanh_out(
+    KernelRuntimeContext& ctx,
+    const Tensor& in,
+    const Scalar& min,
+    const Scalar& max,
+    Tensor& out) {
+  (void)ctx;
+
+#ifdef OP_ARG_CHECK
+  // Resize for dynamic shape
+  ET_KERNEL_CHECK_MSG(
+      ctx,
+      executorch::runtime::resize_tensor(out, in.sizes()) == Error::Ok,
+      InvalidArgument,
+      out,
+      "Failed to resize output tensor.");
+
+  ET_KERNEL_CHECK(
+      ctx,
+      executorch::runtime::tensors_have_same_dim_order(in, out),
+      InvalidArgument,
+      out);
+#endif
+
+  ScalarType in_type = in.scalar_type();
+  ScalarType min_type = get_scalar_dtype(min);
+  ScalarType max_type = get_scalar_dtype(max);
+  ScalarType out_type = out.scalar_type();
+
+  ET_KERNEL_CHECK(ctx, in_type == out_type, InvalidArgument, out);
+
+  if (in_type == ScalarType::Float) {
+    const float* const inp1_data = in.const_data_ptr<float>();
+    float* const out_data = out.mutable_data_ptr<float>();
+    float min_val, max_val;
+    extract_scalar(min, &min_val);
+    extract_scalar(max, &max_val);
+
+    XT_KERNEL_CHECK(
+        ctx,
+        out,
+        xa_nn_elm_clamp_scalar_f32_f32,
+        out_data,
+        inp1_data,
+        min_val,
+        max_val,
+        out.numel());
+  } else {
+    ET_SWITCH_REALHBF16_TYPES(in_type, ctx, "hardtanh.out", CTYPE, [&]() {
+      CTYPE min_casted;
+      ET_SWITCH_SCALAR_OBJ_TYPES(
+          min_type, ctx, "hardtanh.out", CTYPE_MIN, [&]() {
+            CTYPE_MIN min_val;
+            extract_scalar(min, &min_val);
+            min_casted = static_cast<CTYPE>(min_val);
+          });
+
+      CTYPE max_casted;
+      ET_SWITCH_SCALAR_OBJ_TYPES(
+          max_type, ctx, "hardtanh.out", CTYPE_MAX, [&]() {
+            CTYPE_MAX max_val;
+            extract_scalar(max, &max_val);
+            max_casted = static_cast<CTYPE>(max_val);
+          });
+
+      torch::executor::apply_unary_map_fn(
+          [min_casted, max_casted](const CTYPE val_in) {
+            return torch::executor::native::utils::min_override(
+                torch::executor::native::utils::max_override(
+                    val_in, min_casted),
+                max_casted);
+          },
+          in.const_data_ptr<CTYPE>(),
+          out.mutable_data_ptr<CTYPE>(),
+          in.numel());
+    });
+  }
+  return out;
+}
+
+} // namespace native
+} // namespace G3
+} // namespace impl
+} // namespace cadence