42 lines
2.4 KiB
C
42 lines
2.4 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/intrin/pshufhw.h"
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/**
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* Shuffles lower half of word vector.
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* @param 𝑚 needs to be a literal, constexpr, or embedding
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* @mayalias
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*/
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void(pshufhw)(int16_t b[8], const int16_t a[8], uint8_t m) {
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int16_t t[4];
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t[0] = a[4 + ((m & 0b00000011) >> 0)];
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t[1] = a[4 + ((m & 0b00001100) >> 2)];
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t[2] = a[4 + ((m & 0b00110000) >> 4)];
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t[3] = a[4 + ((m & 0b11000000) >> 6)];
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b[0] = a[0];
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b[1] = a[1];
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b[2] = a[2];
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b[3] = a[3];
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b[4] = t[0];
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b[5] = t[1];
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b[6] = t[2];
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b[7] = t[3];
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}
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