softrvv/include/softrvv_vsrl.h

/*
 * Copyright 2023 Google LLC
 *
 * 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
 *
 *     http://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.
 */

#ifndef SOFTRVV_VSRL_H
#define SOFTRVV_VSRL_H

#include <stddef.h>

#include <type_traits>

namespace softrvv {

template <typename T>
void vsrl_vx(T *dest, T *src1, const T *src2, int32_t avl) {
  // Only low lg2(SEW) bits are used for shift
  const T low_bits_mask = sizeof(T) * 8 - 1;
  const T shift = *src2 & low_bits_mask;
  for (int32_t idx = 0; idx < avl; idx++) {
    dest[idx] = static_cast<T>(
        static_cast<typename std::make_unsigned<T>::type>(src1[idx]) >> shift);
  }
}

template <typename T>
void vsrl_vv(T *dest, T *src1, T *src2, int32_t avl) {
  // Only low lg2(SEW) bits are used for shift
  const T low_bits_mask = sizeof(T) * 8 - 1;
  for (int32_t idx = 0; idx < avl; idx++) {
    dest[idx] = static_cast<T>(
        static_cast<typename std::make_unsigned<T>::type>(src1[idx]) >>
        (src2[idx] & low_bits_mask));
  }
}

}  // namespace softrvv

#endif  // SOFTRVV_VSRL_H