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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/intrin/phaddw.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program 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 General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/phaddw.h"
/**
* Adds adjacent signed 16-bit integers.
*
* @param 𝑎 [w/o] receives reduced 𝑏 and 𝑐 concatenated
* @param 𝑏 [r/o] supplies four pairs of shorts
* @param 𝑐 [r/o] supplies four pairs of shorts
* @note goes fast w/ ssse3 (intel c. 2004, amd c. 2011)
* @mayalias
*/
void(phaddw)(short a[8], const short b[8], const short c[8]) {
short t[8];
t[0] = b[0] + b[1];
t[1] = b[2] + b[3];
t[2] = b[4] + b[5];
t[3] = b[6] + b[7];
t[4] = c[0] + c[1];
t[5] = c[2] + c[3];
t[6] = c[4] + c[5];
t[7] = c[6] + c[7];
memcpy(a, t, sizeof(t));
}