2020-06-15 14:18:57 +00:00
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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/pmaddubsw.h"
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#include "libc/limits.h"
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#include "libc/macros.h"
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2020-08-25 11:23:25 +00:00
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#include "libc/str/str.h"
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2020-06-15 14:18:57 +00:00
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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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2020-08-25 11:23:25 +00:00
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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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2020-06-15 14:18:57 +00:00
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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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