41 lines
2.3 KiB
C
41 lines
2.3 KiB
C
/*-*- 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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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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