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/*
* Copyright (c) 2022 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 <cstddef>
namespace arm_conv {
namespace winograd {
namespace weight_transform {
void cpp_fp32_1x6_1x3(
unsigned int n_channels,
const float *inptr, size_t, size_t ld_weight_col,
float *outptr, size_t matrix_stride
)
{
for (; n_channels; n_channels--)
{
// Matrices used and computed in this kernel
float w[3], V[8];
// Read weights
for (int j = 0; j < 3; j++)
{
w[j] = *(inptr + j * ld_weight_col);
}
// Compute V = w WT
V[0] = (w[0]*-1) / 36.0f;
V[1] = (w[1]*-1 + w[0]*1 + w[2]*1) / 48.0f;
V[2] = (w[0]*1 + w[1]*1 + w[2]*1) / 48.0f;
V[3] = (w[0]*-1 + w[2]*-4 + w[1]*2) / 120.0f;
V[4] = (w[0]*-1 + w[2]*-4 + w[1]*-2) / 120.0f;
V[5] = (w[1]*-3 + w[2]*9 + w[0]*1) / 720.0f;
V[6] = (w[1]*3 + w[2]*9 + w[0]*1) / 720.0f;
V[7] = (w[2]*1) / 1;
// Store the transformed weights
for (int j = 0; j < 8; j++)
{
*(outptr + j*matrix_stride) = V[j];
}
inptr++;
outptr++;
}
}
} // namespace weight_transform
} // namespace winograd
} // namespace arm_conv
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