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chafa-avx2.c
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chafa-avx2.c
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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Copyright (C) 2018-2023 Hans Petter Jansson
*
* This file is part of Chafa, a program that shows pictures on text terminals.
*
* Chafa is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Chafa is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Chafa. If not, see <http://www.gnu.org/licenses/>. */
#include "config.h"
#include <emmintrin.h>
#include <immintrin.h>
#include "chafa.h"
#include "internal/chafa-private.h"
gint
calc_error_avx2 (const ChafaPixel *pixels, const ChafaColorPair *color_pair,
const guint32 *sym_mask_u32)
{
__m256i err_8x_u32 = { 0 };
const gint32 *e = (gint32 *) &err_8x_u32;
__m128i fg_4x_u32, bg_4x_u32;
__m256i fg_4x_u64, bg_4x_u64;
const __m256i *pixels_8x_p = (const __m256i *) pixels;
const __m256i *sym_mask_8x_p = (const __m256i *) sym_mask_u32;
gint i;
fg_4x_u32 = _mm_set1_epi32 (CHAFA_COLOR8_U32 (color_pair->colors [CHAFA_COLOR_PAIR_FG]));
fg_4x_u64 = _mm256_cvtepu8_epi16 (fg_4x_u32);
bg_4x_u32 = _mm_set1_epi32 (CHAFA_COLOR8_U32 (color_pair->colors [CHAFA_COLOR_PAIR_BG]));
bg_4x_u64 = _mm256_cvtepu8_epi16 (bg_4x_u32);
for (i = 0; i < CHAFA_SYMBOL_N_PIXELS / 8; i++)
{
__m256i pixels_8x, sym_mask_8x;
__m256i p0, m0, fg0, bg0, d0;
__m256i p1, m1, fg1, bg1, d1;
pixels_8x = _mm256_loadu_si256 (pixels_8x_p);
pixels_8x_p++;
sym_mask_8x = _mm256_loadu_si256 (sym_mask_8x_p);
sym_mask_8x_p++;
p0 = _mm256_cvtepu8_epi16 (_mm256_extracti128_si256 (pixels_8x, 0));
m0 = _mm256_cvtepi8_epi16 (_mm256_extracti128_si256 (sym_mask_8x, 0));
fg0 = _mm256_and_si256 (m0, _mm256_sub_epi16 (fg_4x_u64, p0));
bg0 = _mm256_andnot_si256 (m0, _mm256_sub_epi16 (bg_4x_u64, p0));
d0 = _mm256_or_si256 (fg0, bg0);
d0 = _mm256_mullo_epi16 (d0, d0);
d0 = _mm256_add_epi32 (_mm256_cvtepu16_epi32 (_mm256_extracti128_si256 (d0, 0)),
_mm256_cvtepu16_epi32 (_mm256_extracti128_si256 (d0, 1)));
p1 = _mm256_cvtepu8_epi16 (_mm256_extracti128_si256 (pixels_8x, 1));
m1 = _mm256_cvtepi8_epi16 (_mm256_extracti128_si256 (sym_mask_8x, 1));
fg1 = _mm256_and_si256 (m1, _mm256_sub_epi16 (fg_4x_u64, p1));
bg1 = _mm256_andnot_si256 (m1, _mm256_sub_epi16 (bg_4x_u64, p1));
d1 = _mm256_or_si256 (fg1, bg1);
d1 = _mm256_mullo_epi16 (d1, d1);
d1 = _mm256_add_epi32 (_mm256_cvtepu16_epi32 (_mm256_extracti128_si256 (d1, 0)),
_mm256_cvtepu16_epi32 (_mm256_extracti128_si256 (d1, 1)));
err_8x_u32 = _mm256_add_epi32 (err_8x_u32, d0);
err_8x_u32 = _mm256_add_epi32 (err_8x_u32, d1);
}
return e [0] + e [1] + e [2] + e [4] + e [5] + e [6];
}
void
calc_colors_avx2 (const ChafaPixel *pixels, ChafaColorAccum *accums_out,
const guint32 *sym_mask_u32)
{
const __m128i *pixels_4x_p = (const __m128i *) pixels;
const __m128i *sym_mask_4x_p = (const __m128i *) sym_mask_u32;
__m256i accum_fg = { 0 };
__m256i accum_bg = { 0 };
__m128i accum_fg_128;
__m128i accum_bg_128;
gint i;
for (i = 0; i < CHAFA_SYMBOL_N_PIXELS / 4; i++)
{
__m128i pixels_4x, sym_mask_4x;
pixels_4x = _mm_loadu_si128 (pixels_4x_p++);
sym_mask_4x = _mm_loadu_si128 (sym_mask_4x_p++);
accum_fg = _mm256_add_epi16 (accum_fg,
_mm256_cvtepu8_epi16 (_mm_and_si128 (sym_mask_4x, pixels_4x)));
accum_bg = _mm256_add_epi16 (accum_bg,
_mm256_cvtepu8_epi16 (_mm_andnot_si128 (sym_mask_4x, pixels_4x)));
}
accum_bg_128 = _mm_add_epi16 (_mm256_extracti128_si256 (accum_bg, 0),
_mm256_extracti128_si256 (accum_bg, 1));
((guint64 *) accums_out) [0] =
(guint64) _mm_extract_epi64 (accum_bg_128, 0)
+ (guint64) _mm_extract_epi64 (accum_bg_128, 1);
accum_fg_128 = _mm_add_epi16 (_mm256_extracti128_si256 (accum_fg, 0),
_mm256_extracti128_si256 (accum_fg, 1));
((guint64 *) accums_out) [1] =
(guint64) _mm_extract_epi64 (accum_fg_128, 0)
+ (guint64) _mm_extract_epi64 (accum_fg_128, 1);
}
/* 32768 divided by index. Divide by zero is defined as zero. */
static const guint16 invdiv16 [257] =
{
0, 32768, 16384, 10922, 8192, 6553, 5461, 4681, 4096, 3640, 3276,
2978, 2730, 2520, 2340, 2184, 2048, 1927, 1820, 1724, 1638, 1560,
1489, 1424, 1365, 1310, 1260, 1213, 1170, 1129, 1092, 1057, 1024,
992, 963, 936, 910, 885, 862, 840, 819, 799, 780, 762, 744, 728,
712, 697, 682, 668, 655, 642, 630, 618, 606, 595, 585, 574, 564,
555, 546, 537, 528, 520, 512, 504, 496, 489, 481, 474, 468, 461,
455, 448, 442, 436, 431, 425, 420, 414, 409, 404, 399, 394, 390,
385, 381, 376, 372, 368, 364, 360, 356, 352, 348, 344, 341, 337,
334, 330, 327, 324, 321, 318, 315, 312, 309, 306, 303, 300, 297,
295, 292, 289, 287, 284, 282, 280, 277, 275, 273, 270, 268, 266,
264, 262, 260, 258, 256, 254, 252, 250, 248, 246, 244, 242, 240,
239, 237, 235, 234, 232, 230, 229, 227, 225, 224, 222, 221, 219,
218, 217, 215, 214, 212, 211, 210, 208, 207, 206, 204, 203, 202,
201, 199, 198, 197, 196, 195, 193, 192, 191, 190, 189, 188, 187,
186, 185, 184, 183, 182, 181, 180, 179, 178, 177, 176, 175, 174,
173, 172, 171, 170, 169, 168, 168, 167, 166, 165, 164, 163, 163,
162, 161, 160, 159, 159, 158, 157, 156, 156, 155, 154, 153, 153,
152, 151, 151, 150, 149, 148, 148, 147, 146, 146, 145, 144, 144,
143, 143, 142, 141, 141, 140, 140, 139, 138, 138, 137, 137, 136,
135, 135, 134, 134, 133, 133, 132, 132, 131, 131, 130, 130, 129,
129, 128, 128
};
/* Divisor must be in the range [0..256] inclusive. */
void
chafa_color_accum_div_scalar_avx2 (ChafaColorAccum *accum, guint16 divisor)
{
__m128i accum_128, divisor_128;
accum_128 = _mm_loadu_si64 ((guint64 *) accum);
divisor_128 = _mm_set1_epi16 (invdiv16 [divisor]);
accum_128 = _mm_mulhrs_epi16 (accum_128, divisor_128);
*((guint64 *) accum) = _mm_extract_epi64 (accum_128, 0);
}