36 lines
2.3 KiB
C
36 lines
2.3 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/pshufd.h"
|
|
#include "libc/str/str.h"
|
|
|
|
/**
|
|
* Shuffles int vector.
|
|
* @param 𝑚 needs to be a literal, constexpr, or embedding
|
|
* @mayalias
|
|
*/
|
|
void(pshufd)(int32_t b[4], const int32_t a[4], uint8_t m) {
|
|
int32_t t[4];
|
|
t[0] = a[(m & 0b00000011) >> 0];
|
|
t[1] = a[(m & 0b00001100) >> 2];
|
|
t[2] = a[(m & 0b00110000) >> 4];
|
|
t[3] = a[(m & 0b11000000) >> 6];
|
|
memcpy(b, t, 16);
|
|
}
|