/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2020 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
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#include "libc/intrin/punpcklbw.h"

/**
 * Interleaves low bytes.
 *
 *          0 1 2 3 4 5 6 7 8 9 A B C D E F
 *       B  A B C D E F G H i j k l m n o p
 *       C  Q R S T U V W X y z Î± Ï Ï Î¼ Ï Îµ
 *          â â â â â â â â
 *          â â â âââââââ
 *          â â âââââ   â  etc...
 *          â âââ   â   â
 *          âââ âââ âââ âââ
 *     â A  A Q B R C S D T E U F V G W H X
 *
 * @param ð [w/o] receives reduced ð and ð interleaved
 * @param ð [r/o] supplies eight words
 * @param ð [r/o] supplies eight words
 * @mayalias
 */
void(punpcklbw)(uint8_t a[16], const uint8_t b[16], const uint8_t c[16]) {
  a[0xf] = c[7];
  a[0xe] = b[7];
  a[0xd] = c[6];
  a[0xc] = b[6];
  a[0xb] = c[5];
  a[0xa] = b[5];
  a[0x9] = c[4];
  a[0x8] = b[4];
  a[0x7] = c[3];
  a[0x6] = b[3];
  a[0x5] = c[2];
  a[0x4] = b[2];
  a[0x3] = c[1];
  a[0x2] = b[1];
  a[0x1] = c[0];
  a[0x0] = b[0];
}
