/*
 * Copyright (c) 2017-2018 ARM Limited.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include "arm_gemm.hpp"
#include "gemm_common.hpp"
#include "gemm_interleaved.hpp"
#include "gemm_native.hpp"
#include "gemv_batched.hpp"
#include "gemv_native_transposed.hpp"
#include "gemv_pretransposed.hpp"

#include "kernels/a64_sgemm_12x8.hpp"
#include "kernels/a32_sgemm_8x6.hpp"
#include "kernels/a64_sgemv_trans.hpp"
#include "kernels/a64_sgemv_pretransposed.hpp"
#include "kernels/a64_sgemm_native_16x4.hpp"

namespace arm_gemm {

template<>
UniqueGemmCommon<float, float> gemm<float, float>(const CPUInfo &ci, const unsigned int M, const unsigned int N, const unsigned int K,
                                                  const unsigned int nbatches, const unsigned int nmulti,
                                                  const bool trA, const bool trB, const float alpha, const float beta,
                                                  const int maxthreads, const bool pretransposed_hint) {
    /* Handle "batched GEMV" */
    if (M==1 && nbatches>1) {
        return UniqueGemmCommon<float, float> (new GemvBatched<float, float>(ci, M, N, K, nbatches, nmulti, trA, trB, alpha, beta, maxthreads, pretransposed_hint));
    }

#ifdef __aarch64__
    /* Cases in priority order */
    /* GemvPretransposed: requires M=1, alpha=1, and transposed hint set.  nbatches must be 1 or we would have returned above so don't test. */
    if (M==1 && alpha==1.0f && pretransposed_hint) {
        return UniqueGemmCommon<float, float> (new GemvPretransposed<sgemv_pretransposed, float, float>(&ci, N, K, nmulti, trB, beta));
    }

    /* GemvNativeTransposed: requires M=1, no trA or trB, doesn't handle alpha */
    if (M==1 && alpha==1.0f && !trA && !trB) {
        return UniqueGemmCommon<float, float> (new GemvNativeTransposed<sgemv_trans, float, float>(&ci, N, K, nmulti, beta));
    }

    /* Native GEMM: requires K at least 4, N a multiple of 16, doesn't
     * handle alpha or transpose.  Use for small N/K, or if the blocked GEMM
     * won't thread properly.  */
    if ((K >= 4) && ((N % 16) == 0) && alpha==1.0f && !trA && !trB &&
        ((K <= 128 && N <= 128) || (nmulti > 1 && (M/maxthreads) < 8))) {
        return UniqueGemmCommon<float, float> (new GemmNative<sgemm_native_16x4, float, float>(&ci, M, N, K, nbatches, nmulti, beta));
    }

    /* Blocked GEMM, handles all cases. */
    return UniqueGemmCommon<float, float> (new GemmInterleaved<sgemm_12x8, float, float>(&ci, M, N, K, nbatches, nmulti, trA, trB, alpha, beta, maxthreads, pretransposed_hint));
#else
    return UniqueGemmCommon<float, float> (new GemmInterleaved<sgemm_8x6, float, float>(&ci, M, N, K, nbatches, nmulti, trA, trB, alpha, beta, maxthreads, pretransposed_hint));
#endif
}

// Instantiate static class variables.
#ifdef __aarch64__
const int sgemm_12x8::out_width;
const int sgemm_12x8::out_height;

const int sgemm_native_16x4::out_width;
const int sgemm_native_16x4::out_height;
#else
const int sgemm_8x6::out_width;
const int sgemm_8x6::out_height;
#endif

} // namespace arm_gemm