TableFunctions.hpp

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/*
 * Copyright 2019 OmniSci, Inc.
 *
 * 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.
 */

#include "../../Shared/funcannotations.h"

#define EXTENSION_INLINE extern "C" ALWAYS_INLINE DEVICE
#define EXTENSION_NOINLINE extern "C" NEVER_INLINE DEVICE

#ifdef __CUDACC__

EXTENSION_INLINE int32_t row_copier_kernel(double* input_col,
                                           int* copy_multiplier,
                                           const int64_t input_row_count,
                                           int64_t* output_row_count,
                                           double* output_buffer) {
  int32_t start = threadIdx.x + blockDim.x * blockIdx.x;
  int32_t step = blockDim.x * gridDim.x;
  for (int32_t i = start; i < static_cast<int32_t>(input_row_count); i += step) {
    for (int c = 0; c < *copy_multiplier; c++) {
      output_buffer[i + (c * input_row_count)] = input_col[i];
    }
  }
  return 0;
}

#endif

EXTENSION_NOINLINE int32_t row_copier(double* input_col,
                                      int* copy_multiplier,
                                      const int64_t* input_row_count_ptr,
                                      int64_t* output_row_count,
                                      double* output_buffer) {
#ifdef __CUDACC__
  return row_copier_kernel(
      input_col, copy_multiplier, *input_row_count_ptr, output_row_count, output_buffer);
#else
  // Copy the input buffer to the output, duplicating according to copy_multiplier
  const auto input_row_count = *input_row_count_ptr;

  for (auto i = 0; i < input_row_count; i++) {
    for (int c = 0; c < *copy_multiplier; c++) {
      output_buffer[i + (c * input_row_count)] = input_col[i];
    }
  }

  *output_row_count = (*copy_multiplier) * input_row_count;
  return 0;
#endif
}