58 lines
2.9 KiB
C
58 lines
2.9 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/punpcklbw.h"
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/**
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* Interleaves low bytes.
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*
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* 0 1 2 3 4 5 6 7 8 9 A B C D E F
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* B A B C D E F G H i j k l m n o p
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* C Q R S T U V W X y z α σ π μ τ ε
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* │ │ │ │ │ │ │ │
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* │ │ │ └─────┐
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* │ │ └───┐ │ etc...
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* │ └─┐ │ │
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* ├─┐ ├─┐ ├─┐ ├─┐
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* → A A Q B R C S D T E U F V G W H X
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*
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* @param 𝑎 [w/o] receives reduced 𝑏 and 𝑐 interleaved
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* @param 𝑏 [r/o] supplies eight words
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* @param 𝑐 [r/o] supplies eight words
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* @mayalias
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*/
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void(punpcklbw)(uint8_t a[16], const uint8_t b[16], const uint8_t c[16]) {
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a[0xf] = c[7];
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a[0xe] = b[7];
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a[0xd] = c[6];
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a[0xc] = b[6];
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a[0xb] = c[5];
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a[0xa] = b[5];
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a[0x9] = c[4];
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a[0x8] = b[4];
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a[0x7] = c[3];
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a[0x6] = b[3];
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a[0x5] = c[2];
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a[0x4] = b[2];
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a[0x3] = c[1];
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a[0x2] = b[1];
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a[0x1] = c[0];
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a[0x0] = b[0];
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}
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