| // Copyright 2019 Google LLC |
| // |
| // This source code is licensed under the BSD-style license found in the |
| // LICENSE file in the root directory of this source tree. |
| |
| #include <assert.h> |
| |
| #include <stdio.h> |
| |
| #include <xnnpack/dwconv.h> |
| #include <xnnpack/math.h> |
| |
| |
| void xnn_f32_dwconv_chw_ukernel_3x3s2p1__scalar( |
| size_t input_height, |
| size_t input_width, |
| const float* input, |
| const float* weights, |
| const float* zero, |
| float* output, |
| uint32_t padding_top, |
| size_t input_tuple_stride, |
| size_t output_tuple_stride, |
| size_t input_width_stride, |
| size_t output_width_stride, |
| const union xnn_f32_chw_params params[restrict XNN_MIN_ELEMENTS(1)]) |
| { |
| assert(input_height!= 0); |
| assert(input_width != 0); |
| assert(padding_top >= 0 && padding_top <= 1); |
| |
| const size_t padded_input_height = input_height + padding_top + 1 /* padding_bottom */; |
| const size_t output_height = (padded_input_height - 3) / 2 + 1; |
| |
| const size_t input_width_decrement_single = (input_width/2) * 2 * input_tuple_stride;; |
| const size_t input_width_increment = 2 * input_width_stride - input_width_decrement_single; |
| const size_t output_width_increment = output_width_stride - (input_width/2) * output_tuple_stride; |
| |
| const float params_min = params->scalar.min; |
| const float params_max = params->scalar.max; |
| |
| const float* i0; |
| const float* i1; |
| const float* i2; |
| |
| if (padding_top == 0) { |
| i0 = input; |
| i1 = (const float*) ((uintptr_t) i0 + input_width_stride); |
| i2 = (const float*) ((uintptr_t) i1 + input_width_stride); |
| if (input_height <= 2) { |
| i2 = zero; |
| } |
| if (input_height == 1) { |
| i1 = zero; |
| } |
| } else { |
| i0 = zero; |
| i1 = input; |
| i2 = (const float*) ((uintptr_t) i1 + input_width_stride); |
| if (input_height == 1) { |
| i2 = zero; |
| } |
| } |
| |
| float* output0 = output; |
| |
| const float vw0 = weights[0]; |
| const float vw1 = weights[1]; |
| const float vw2 = weights[2]; |
| const float vw3 = weights[3]; |
| const float vw4 = weights[4]; |
| const float vw5 = weights[5]; |
| const float vw6 = weights[6]; |
| const float vw7 = weights[7]; |
| const float vw8 = weights[8]; |
| const float vw9 = weights[9]; |
| |
| size_t m = output_height; |
| while (m > 0) { |
| float vi0x0 = 0.0f; |
| float vi1x0 = 0.0f; |
| float vi2x0 = 0.0f; |
| |
| size_t k = input_width; |
| for (; k >= 2; k -= 2) { |
| const float vi0x1 = *i0; i0 = (const float*) ((uintptr_t) i0 + input_tuple_stride); |
| const float vi1x1 = *i1; i1 = (const float*) ((uintptr_t) i1 + input_tuple_stride); |
| const float vi2x1 = *i2; i2 = (const float*) ((uintptr_t) i2 + input_tuple_stride); |
| const float vi0x2 = *i0; i0 = (const float*) ((uintptr_t) i0 + input_tuple_stride); |
| const float vi1x2 = *i1; i1 = (const float*) ((uintptr_t) i1 + input_tuple_stride); |
| const float vi2x2 = *i2; i2 = (const float*) ((uintptr_t) i2 + input_tuple_stride); |
| |
| const float vrow0_accum = vw1 * vi0x0 + vw2 * vi0x1 + vw3 * vi0x2; |
| vi0x0 = vi0x2; |
| const float vrow1_accum = vw4 * vi1x0 + vw5 * vi1x1 + vw6 * vi1x2; |
| vi1x0 = vi1x2; |
| const float vrow2_accum = vw7 * vi2x0 + vw8 * vi2x1 + vw9 * vi2x2; |
| vi2x0 = vi2x2; |
| |
| float voutput = (vw0 + vrow0_accum) + (vrow1_accum + vrow2_accum); |
| |
| voutput = math_max_f32(voutput, params_min); |
| voutput = math_min_f32(voutput, params_max); |
| |
| *output0 = voutput; output0 = (float *) ((uintptr_t) output0 + output_tuple_stride); |
| } |
| // Possibly process the last pixel separately to account for right edge. |
| if (k == 1) |
| { |
| const float vi0x1 = i0[0]; |
| const float vi1x1 = i1[0]; |
| const float vi2x1 = i2[0]; |
| const float vrow0_accum = vw1 * vi0x0 + vw2 * vi0x1; |
| const float vrow1_accum = vw4 * vi1x0 + vw5 * vi1x1; |
| const float vrow2_accum = vw7 * vi2x0 + vw8 * vi2x1; |
| |
| float voutput = (vw0 + vrow0_accum) + (vrow1_accum + vrow2_accum); |
| |
| voutput = math_max_f32(voutput, params_min); |
| voutput = math_min_f32(voutput, params_max); |
| |
| *output0 = voutput; |
| } |
| |
| i0 = (const float*) ((uintptr_t) i2 - input_width_decrement_single); |
| i1 = (const float*) ((uintptr_t) i1 + input_width_increment); |
| i2 = (const float*) ((uintptr_t) i2 + input_width_increment); |
| output0 = (float*) ((uintptr_t) output0 + output_width_increment); |
| m -= 1; |
| if (m == 1 && padding_top == input_height % 2) { |
| // to mimic the following code with only one if, we do some small |
| // shenanigans... |
| // if (padding_top == 0 && input_height % 2 == 0) { |
| // i2 = zero; |
| // } else if (padding_top == 1 && input_height % 2 == 1) { |
| // i2 = zero; |
| // } |
| i2 = zero; |
| } |
| } |
| } |