cosmopolitan/libc/intrin/pcmpeqd.c

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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/pcmpeqd.h"
#include "libc/str/str.h"
/**
* Compares signed 32-bit integers w/ equal to predicate.
*
* @param 𝑎 [w/o] receives result
* @param 𝑏 [r/o] supplies first input vector
* @param 𝑐 [r/o] supplies second input vector
* @mayalias
*/
void(pcmpeqd)(int32_t a[4], const int32_t b[4], const int32_t c[4]) {
unsigned i;
int32_t r[4];
for (i = 0; i < 4; ++i) r[i] = -(b[i] == c[i]);
memcpy(a, r, 16);
}