// Auto-generated file. Do not edit! // Template: src/f32-dwconv2d-chw/5x5s2p2-wasmsimd-splat.c.in // Generator: tools/xngen // // Copyright 2020 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 #include #include #include void xnn_f32_dwconv2d_chw_ukernel_5x5s2p2__wasmsimd_arm_splat_1x4_acc2( size_t input_height, size_t input_width, const float* input, const float* weights, const float* zero, float* output, uint32_t padding_top, const union xnn_f32_chw_params params[restrict XNN_MIN_ELEMENTS(1)]) { assert(input_height != 0); assert(input_width != 0); assert(input_width % sizeof(float) == 0); assert(padding_top >= 1); assert(padding_top <= 2); const v128_t vmask_even = wasm_v128_load(params->scalar.mask_even); const v128_t vmask_odd = wasm_v128_load(params->scalar.mask_odd); const v128_t vmax = wasm_v32x4_load_splat(¶ms->scalar.max); const v128_t vmin = wasm_v32x4_load_splat(¶ms->scalar.min); const v128_t vw0123 = wasm_v128_load(weights); const v128_t vw4567 = wasm_v128_load(weights + 4); const v128_t vw89AB = wasm_v128_load(weights + 8); const v128_t vwCDEF = wasm_v128_load(weights + 12); const v128_t vwGHIJ = wasm_v128_load(weights + 16); const v128_t vwKLMN = wasm_v128_load(weights + 20); const v128_t vwOP = wasm_v64x2_load_splat(weights + 24); const v128_t vzero = wasm_f32x4_splat(0.0f); const uint32_t padding_top_less_1 = padding_top - 1; const size_t input_decrement = round_up_po2(input_width, 8 * sizeof(float)); const float* i0 = zero; const float* i1 = (const float*) ((uintptr_t) input - ((-padding_top_less_1) & input_width)); const float* i2 = (const float*) ((uintptr_t) i1 + input_width); if XNN_UNPREDICTABLE(padding_top_less_1 != 0) { i1 = zero; } const float* i3 = (const float*) ((uintptr_t) i2 + input_width); const float* i4 = (const float*) ((uintptr_t) i3 + input_width); float* o0 = output; size_t padded_input_height = input_height + (padding_top_less_1 + 1) + 2 /* padding bottom */; size_t output_height = (padded_input_height - 5 /* kernel size */ + 2 /* subsampling */) / 2; do { if XNN_UNPREDICTABLE(padded_input_height < 6) { i3 = zero; } if XNN_UNPREDICTABLE(padded_input_height < 7) { i4 = zero; } v128_t vi0x0246 = vzero; v128_t vi1x0246 = vzero; v128_t vi2x0246 = vzero; v128_t vi3x0246 = vzero; v128_t vi4x0246 = vzero; v128_t vi0x1357 = vzero; v128_t vi1x1357 = vzero; v128_t vi2x1357 = vzero; v128_t vi3x1357 = vzero; v128_t vi4x1357 = vzero; const v128_t vi0x89AB = wasm_v128_load(i0); const v128_t vi0xCDEF = wasm_v128_load(i0 + 4); i0 += 8; const v128_t vi1x89AB = wasm_v128_load(i1); const v128_t vi1xCDEF = wasm_v128_load(i1 + 4); i1 += 8; const v128_t vi2x89AB = wasm_v128_load(i2); const v128_t vi2xCDEF = wasm_v128_load(i2 + 4); i2 += 8; const v128_t vi3x89AB = wasm_v128_load(i3); const v128_t vi3xCDEF = wasm_v128_load(i3 + 4); i3 += 8; const v128_t vi4x89AB = wasm_v128_load(i4); const v128_t vi4xCDEF = wasm_v128_load(i4 + 4); i4 += 8; v128_t vi0x8ACE = wasm_v32x4_shuffle(vi0x89AB, vi0xCDEF, 0, 2, 4, 6); v128_t vi0x9BDF = wasm_v32x4_shuffle(vi0x89AB, vi0xCDEF, 1, 3, 5, 7); v128_t vi1x8ACE = wasm_v32x4_shuffle(vi1x89AB, vi1xCDEF, 0, 2, 4, 6); v128_t vi1x9BDF = wasm_v32x4_shuffle(vi1x89AB, vi1xCDEF, 1, 3, 5, 7); v128_t vi2x8ACE = wasm_v32x4_shuffle(vi2x89AB, vi2xCDEF, 0, 2, 4, 6); v128_t vi2x9BDF = wasm_v32x4_shuffle(vi2x89AB, vi2xCDEF, 1, 3, 5, 7); v128_t vi3x8ACE = wasm_v32x4_shuffle(vi3x89AB, vi3xCDEF, 0, 2, 4, 6); v128_t vi3x9BDF = wasm_v32x4_shuffle(vi3x89AB, vi3xCDEF, 1, 3, 5, 7); v128_t vi4x8ACE = wasm_v32x4_shuffle(vi4x89AB, vi4xCDEF, 0, 2, 4, 6); v128_t vi4x9BDF = wasm_v32x4_shuffle(vi4x89AB, vi4xCDEF, 1, 3, 5, 7); size_t w = input_width; for (; w > 8 * sizeof(float); w -= 8 * sizeof(float)) { v128_t vo0p0 = wasm_v32x4_shuffle(vw0123, vw0123, 0, 0, 0, 0); v128_t vo0p1 = wasm_f32x4_mul(vi0x8ACE, wasm_v32x4_shuffle(vw0123, vw0123, 3, 3, 3, 3)); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi1x8ACE, wasm_v32x4_shuffle(vw89AB, vw89AB, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi2x8ACE, wasm_v32x4_shuffle(vwCDEF, vwCDEF, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi3x8ACE, wasm_v32x4_shuffle(vwGHIJ, vwGHIJ, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi4x8ACE, wasm_v32x4_shuffle(vwKLMN, vwKLMN, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi0x9BDF, wasm_v32x4_shuffle(vw4567, vw4567, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi1x9BDF, wasm_v32x4_shuffle(vw89AB, vw89AB, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi2x9BDF, wasm_v32x4_shuffle(vwCDEF, vwCDEF, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi3x9BDF, wasm_v32x4_shuffle(vwGHIJ, vwGHIJ, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi4x9BDF, wasm_v32x4_shuffle(vwOP, vwOP, 0, 0, 0, 0))); const v128_t vi0x68AC = wasm_v32x4_shuffle(vi0x0246, vi0x8ACE, 3, 4, 5, 6); vi0x0246 = vi0x8ACE; const v128_t vi1x68AC = wasm_v32x4_shuffle(vi1x0246, vi1x8ACE, 3, 4, 5, 6); vi1x0246 = vi1x8ACE; const v128_t vi2x68AC = wasm_v32x4_shuffle(vi2x0246, vi2x8ACE, 3, 4, 5, 6); vi2x0246 = vi2x8ACE; const v128_t vi3x68AC = wasm_v32x4_shuffle(vi3x0246, vi3x8ACE, 3, 4, 5, 6); vi3x0246 = vi3x8ACE; const v128_t vi4x68AC = wasm_v32x4_shuffle(vi4x0246, vi4x8ACE, 3, 4, 5, 6); vi4x0246 = vi4x8ACE; vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi0x68AC, wasm_v32x4_shuffle(vw0123, vw0123, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi1x68AC, wasm_v32x4_shuffle(vw4567, vw4567, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi2x68AC, wasm_v32x4_shuffle(vw89AB, vw89AB, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi3x68AC, wasm_v32x4_shuffle(vwGHIJ, vwGHIJ, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi4x68AC, wasm_v32x4_shuffle(vwKLMN, vwKLMN, 1, 1, 1, 1))); const v128_t vi0x79BD = wasm_v32x4_shuffle(vi0x1357, vi0x9BDF, 3, 4, 5, 6); vi0x1357 = vi0x9BDF; const v128_t vi1x79BD = wasm_v32x4_shuffle(vi1x1357, vi1x9BDF, 3, 4, 5, 6); vi1x1357 = vi1x9BDF; const v128_t vi2x79BD = wasm_v32x4_shuffle(vi2x1357, vi2x9BDF, 3, 4, 5, 6); vi2x1357 = vi2x9BDF; const v128_t vi3x79BD = wasm_v32x4_shuffle(vi3x1357, vi3x9BDF, 3, 4, 5, 6); vi3x1357 = vi3x9BDF; const v128_t vi4x79BD = wasm_v32x4_shuffle(vi4x1357, vi4x9BDF, 3, 4, 5, 6); vi4x1357 = vi4x9BDF; const v128_t vi0xGHIJ = wasm_v128_load(i0); const v128_t vi0xKLMN = wasm_v128_load(i0 + 4); i0 += 8; const v128_t vi1xGHIJ = wasm_v128_load(i1); const v128_t vi1xKLMN = wasm_v128_load(i1 + 4); i1 += 8; const v128_t vi2xGHIJ = wasm_v128_load(i2); const v128_t vi2xKLMN = wasm_v128_load(i2 + 4); i2 += 8; const v128_t vi3xGHIJ = wasm_v128_load(i3); const v128_t vi3xKLMN = wasm_v128_load(i3 + 4); i3 += 8; const v128_t vi4xGHIJ = wasm_v128_load(i4); const v128_t vi4xKLMN = wasm_v128_load(i4 + 4); i4 += 8; const v128_t vi0xGIKM = wasm_v32x4_shuffle(vi0xGHIJ, vi0xKLMN, 0, 2, 4, 6); const v128_t vi0xHJLN = wasm_v32x4_shuffle(vi0xGHIJ, vi0xKLMN, 1, 3, 5, 7); const v128_t vi1xGIKM = wasm_v32x4_shuffle(vi1xGHIJ, vi1xKLMN, 0, 2, 4, 6); const v128_t vi1xHJLN = wasm_v32x4_shuffle(vi1xGHIJ, vi1xKLMN, 1, 3, 5, 7); const v128_t vi2xGIKM = wasm_v32x4_shuffle(vi2xGHIJ, vi2xKLMN, 0, 2, 4, 6); const v128_t vi2xHJLN = wasm_v32x4_shuffle(vi2xGHIJ, vi2xKLMN, 1, 3, 5, 7); const v128_t vi3xGIKM = wasm_v32x4_shuffle(vi3xGHIJ, vi3xKLMN, 0, 2, 4, 6); const v128_t vi3xHJLN = wasm_v32x4_shuffle(vi3xGHIJ, vi3xKLMN, 1, 3, 5, 7); const v128_t vi4xGIKM = wasm_v32x4_shuffle(vi4xGHIJ, vi4xKLMN, 0, 2, 4, 6); const v128_t vi4xHJLN = wasm_v32x4_shuffle(vi4xGHIJ, vi4xKLMN, 1, 3, 5, 7); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi0x79BD, wasm_v32x4_shuffle(vw0123, vw0123, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi1x79BD, wasm_v32x4_shuffle(vw4567, vw4567, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi2x79BD, wasm_v32x4_shuffle(vwCDEF, vwCDEF, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi3x79BD, wasm_v32x4_shuffle(vwGHIJ, vwGHIJ, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi4x79BD, wasm_v32x4_shuffle(vwKLMN, vwKLMN, 2, 2, 2, 2))); const v128_t vi0xACEG = wasm_v32x4_shuffle(vi0x8ACE, vi0xGIKM, 1, 2, 3, 4); vi0x8ACE = vi0xGIKM; vi0x9BDF = vi0xHJLN; const v128_t vi1xACEG = wasm_v32x4_shuffle(vi1x8ACE, vi1xGIKM, 1, 2, 3, 4); vi1x8ACE = vi1xGIKM; vi1x9BDF = vi1xHJLN; const v128_t vi2xACEG = wasm_v32x4_shuffle(vi2x8ACE, vi2xGIKM, 1, 2, 3, 4); vi2x8ACE = vi2xGIKM; vi2x9BDF = vi2xHJLN; const v128_t vi3xACEG = wasm_v32x4_shuffle(vi3x8ACE, vi3xGIKM, 1, 2, 3, 4); vi3x8ACE = vi3xGIKM; vi3x9BDF = vi3xHJLN; const v128_t vi4xACEG = wasm_v32x4_shuffle(vi4x8ACE, vi4xGIKM, 1, 2, 3, 4); vi4x8ACE = vi4xGIKM; vi4x9BDF = vi4xHJLN; vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi0xACEG, wasm_v32x4_shuffle(vw4567, vw4567, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi1xACEG, wasm_v32x4_shuffle(vw89AB, vw89AB, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi2xACEG, wasm_v32x4_shuffle(vwCDEF, vwCDEF, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi3xACEG, wasm_v32x4_shuffle(vwKLMN, vwKLMN, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi4xACEG, wasm_v32x4_shuffle(vwOP, vwOP, 1, 1, 1, 1))); vo0p0 = wasm_f32x4_add(vo0p0, vo0p1); v128_t vo0 = wasm_f32x4_max(vo0p0, vmin); vo0 = wasm_f32x4_min(vo0, vmax); wasm_v128_store(o0, vo0); o0 += 4; } // Last block has 1-8 pixels to process. assert(w <= 8 * sizeof(float)); assert(w >= 1 * sizeof(float)); { v128_t vo0p0 = wasm_v32x4_shuffle(vw0123, vw0123, 0, 0, 0, 0); vi0x8ACE = wasm_v128_and(vmask_even, vi0x8ACE); vi1x8ACE = wasm_v128_and(vmask_even, vi1x8ACE); vi2x8ACE = wasm_v128_and(vmask_even, vi2x8ACE); vi3x8ACE = wasm_v128_and(vmask_even, vi3x8ACE); vi4x8ACE = wasm_v128_and(vmask_even, vi4x8ACE); vi0x9BDF = wasm_v128_and(vmask_odd, vi0x9BDF); vi1x9BDF = wasm_v128_and(vmask_odd, vi1x9BDF); vi2x9BDF = wasm_v128_and(vmask_odd, vi2x9BDF); vi3x9BDF = wasm_v128_and(vmask_odd, vi3x9BDF); vi4x9BDF = wasm_v128_and(vmask_odd, vi4x9BDF); v128_t vo0p1 = wasm_f32x4_mul(vi0x8ACE, wasm_v32x4_shuffle(vw0123, vw0123, 3, 3, 3, 3)); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi1x8ACE, wasm_v32x4_shuffle(vw89AB, vw89AB, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi2x8ACE, wasm_v32x4_shuffle(vwCDEF, vwCDEF, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi3x8ACE, wasm_v32x4_shuffle(vwGHIJ, vwGHIJ, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi4x8ACE, wasm_v32x4_shuffle(vwKLMN, vwKLMN, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi0x9BDF, wasm_v32x4_shuffle(vw4567, vw4567, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi1x9BDF, wasm_v32x4_shuffle(vw89AB, vw89AB, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi2x9BDF, wasm_v32x4_shuffle(vwCDEF, vwCDEF, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi3x9BDF, wasm_v32x4_shuffle(vwGHIJ, vwGHIJ, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi4x9BDF, wasm_v32x4_shuffle(vwOP, vwOP, 0, 0, 0, 0))); const v128_t vi0x68AC = wasm_v32x4_shuffle(vi0x0246, vi0x8ACE, 3, 4, 5, 6); const v128_t vi1x68AC = wasm_v32x4_shuffle(vi1x0246, vi1x8ACE, 3, 4, 5, 6); const v128_t vi2x68AC = wasm_v32x4_shuffle(vi2x0246, vi2x8ACE, 3, 4, 5, 6); const v128_t vi3x68AC = wasm_v32x4_shuffle(vi3x0246, vi3x8ACE, 3, 4, 5, 6); const v128_t vi4x68AC = wasm_v32x4_shuffle(vi4x0246, vi4x8ACE, 3, 4, 5, 6); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi0x68AC, wasm_v32x4_shuffle(vw0123, vw0123, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi1x68AC, wasm_v32x4_shuffle(vw4567, vw4567, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi2x68AC, wasm_v32x4_shuffle(vw89AB, vw89AB, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi3x68AC, wasm_v32x4_shuffle(vwGHIJ, vwGHIJ, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi4x68AC, wasm_v32x4_shuffle(vwKLMN, vwKLMN, 1, 1, 1, 1))); const v128_t vi0x79BD = wasm_v32x4_shuffle(vi0x1357, vi0x9BDF, 3, 4, 5, 6); const v128_t vi1x79BD = wasm_v32x4_shuffle(vi1x1357, vi1x9BDF, 3, 4, 5, 6); const v128_t vi2x79BD = wasm_v32x4_shuffle(vi2x1357, vi2x9BDF, 3, 4, 5, 6); const v128_t vi3x79BD = wasm_v32x4_shuffle(vi3x1357, vi3x9BDF, 3, 4, 5, 6); const v128_t vi4x79BD = wasm_v32x4_shuffle(vi4x1357, vi4x9BDF, 3, 4, 5, 6); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi0x79BD, wasm_v32x4_shuffle(vw0123, vw0123, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi1x79BD, wasm_v32x4_shuffle(vw4567, vw4567, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi2x79BD, wasm_v32x4_shuffle(vwCDEF, vwCDEF, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi3x79BD, wasm_v32x4_shuffle(vwGHIJ, vwGHIJ, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi4x79BD, wasm_v32x4_shuffle(vwKLMN, vwKLMN, 2, 2, 2, 2))); const v128_t vi0xACEG = wasm_v32x4_shuffle(vi0x8ACE, vzero, 1, 2, 3, 4); const v128_t vi1xACEG = wasm_v32x4_shuffle(vi1x8ACE, vzero, 1, 2, 3, 4); const v128_t vi2xACEG = wasm_v32x4_shuffle(vi2x8ACE, vzero, 1, 2, 3, 4); const v128_t vi3xACEG = wasm_v32x4_shuffle(vi3x8ACE, vzero, 1, 2, 3, 4); const v128_t vi4xACEG = wasm_v32x4_shuffle(vi4x8ACE, vzero, 1, 2, 3, 4); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi0xACEG, wasm_v32x4_shuffle(vw4567, vw4567, 1, 1, 1, 1))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi1xACEG, wasm_v32x4_shuffle(vw89AB, vw89AB, 2, 2, 2, 2))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi2xACEG, wasm_v32x4_shuffle(vwCDEF, vwCDEF, 3, 3, 3, 3))); vo0p1 = wasm_f32x4_add(vo0p1, wasm_f32x4_mul(vi3xACEG, wasm_v32x4_shuffle(vwKLMN, vwKLMN, 0, 0, 0, 0))); vo0p0 = wasm_f32x4_add(vo0p0, wasm_f32x4_mul(vi4xACEG, wasm_v32x4_shuffle(vwOP, vwOP, 1, 1, 1, 1))); vo0p0 = wasm_f32x4_add(vo0p0, vo0p1); v128_t vo0 = wasm_f32x4_max(vo0p0, vmin); vo0 = wasm_f32x4_min(vo0, vmax); size_t w_tmp = (w + 1 * sizeof(float)) / (2 * sizeof(float)); if XNN_LIKELY(w_tmp >= 4) { wasm_v128_store(o0, vo0); o0 += 4; } else { if (w_tmp & 2) { *((double*) o0) = wasm_f64x2_extract_lane(vo0, 0); o0 += 2; vo0 = wasm_v32x4_shuffle(vo0, vo0, 2, 3, 0, 1); } if (w_tmp & 1) { *o0 = wasm_f32x4_extract_lane(vo0, 0); o0 += 1; } } } i0 = (const float*) ((uintptr_t) i2 - input_decrement); i1 = (const float*) ((uintptr_t) i3 - input_decrement); i2 = (const float*) ((uintptr_t) i4 - input_decrement); i3 = (const float*) ((uintptr_t) i2 + input_width); i4 = (const float*) ((uintptr_t) i3 + input_width); output_height -= 1; padded_input_height -= 2; } while (output_height != 0); }