// Copyright 2024 Google LLC
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Compiles this file for multiple architectures via "foreach_target.h", to
// which we pass the filename via macro 'argument'.
#undef HWY_TARGET_INCLUDE
#define HWY_TARGET_INCLUDE "gemma/common_scalar.cc"  // NOLINT
#include "hwy/foreach_target.h"        // IWYU pragma: keep

#include "gemma/ops.h"
#include "hwy/highway.h"

HWY_BEFORE_NAMESPACE();
namespace gcpp {
namespace HWY_NAMESPACE {
namespace hn = hwy::HWY_NAMESPACE;

float EmbeddingScaling(int model_dim) {
  // Round to bf16 to match Gemma's Embedder, which casts before mul.
  return hwy::ConvertScalarTo<float>(hwy::ConvertScalarTo<hwy::bfloat16_t>(
      Sqrt(static_cast<float>(model_dim))));
}

}  // namespace HWY_NAMESPACE
}  // namespace gcpp
HWY_AFTER_NAMESPACE();

#if HWY_ONCE
namespace gcpp {

HWY_EXPORT(EmbeddingScaling);

float EmbeddingScaling(int model_dim) {
  return HWY_DYNAMIC_DISPATCH(EmbeddingScaling)(model_dim);
}

}  // namespace gcpp
#endif  // HWY_ONCE