cosmopolitan/libc/intrin/pabsd.c

36 lines
2.2 KiB
C

/*-*- 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/pabsd.h"
#include "libc/macros.h"
#include "libc/str/str.h"
/**
* Converts shorts to absolute values, 𝑎ᵢ ← |𝑏ᵢ|.
* @note goes fast w/ ssse3 (intel c. 2004, amd c. 2011)
*/
void(pabsd)(uint32_t a[4], const int32_t b[4]) {
unsigned i;
uint32_t r[4];
for (i = 0; i < 4; ++i) {
r[i] = ABS(b[i]);
}
memcpy(a, r, 16);
}