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42 lines
2.6 KiB
C
42 lines
2.6 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/pmaddubsw.h"
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#include "libc/limits.h"
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#include "libc/macros.internal.h"
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#include "libc/str/str.h"
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/**
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* Multiplies bytes and adds adjacent results w/ short saturation.
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*
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* 𝑤ᵢ ← CLAMP[ 𝑏₂ᵢ𝑐₂ᵢ + 𝑏₍₂ᵢ₊₁₎𝑐₍₂ᵢ₊₁₎ ]
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*
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* @param 𝑤 [w/o] receives shorts
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* @param 𝑏 [r/o] is your byte data
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* @param 𝑐 [r/o] are your int8 coefficients
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* @note SSSE3 w/ Prescott c. 2004, Bulldozer c. 2011
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* @note greatest simd op, like, ever
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* @mayalias
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*/
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void(pmaddubsw)(int16_t w[8], const uint8_t b[16], const int8_t c[16]) {
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unsigned i;
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for (i = 0; i < 8; ++i) {
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w[i] = MIN(SHRT_MAX, MAX(SHRT_MIN, (c[i * 2 + 0] * b[i * 2 + 0] +
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c[i * 2 + 1] * b[i * 2 + 1])));
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}
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}
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