mirror of
https://github.com/VK3FNG/soundmodem.git
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99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
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/*****************************************************************************/
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/*
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* simd.c -- SIMD (aka MMX and VIS) routines.
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*
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* Copyright (C) 1999 Thomas Sailer (sailer@ife.ee.ethz.ch)
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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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Please note that the GPL allows you to use the driver, NOT the radio.
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* In order to use the radio, you need a license from the communications
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* authority of your country.
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*
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*/
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/*****************************************************************************/
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#define _GNU_SOURCE
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#define _REENTRANT
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* AIX requires this to be the first thing in the file. */
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#ifndef __GNUC__
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# if HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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# ifdef _AIX
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#pragma alloca
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# else
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# ifndef alloca /* predefined by HP cc +Olibcalls */
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char *alloca ();
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# endif
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# endif
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# endif
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#endif
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#include "modem.h"
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/* ---------------------------------------------------------------------- */
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#if defined(USEMMX)
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unsigned int simd_enabled = 0;
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static inline unsigned int cpucapability(void)
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{
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unsigned int a, b, c, d;
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asm("pushfl \n\t"
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"popl %0 \n\t"
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"movl %0,%1 \n\t"
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"xorl $0x00200000,%0 \n\t"
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"pushl %0 \n\t"
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"popfl \n\t"
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"pushfl \n\t"
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"popl %0 \n\t"
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: "=r" (a), "=r" (b));
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if (a == b)
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return 0;
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asm("cpuid" : "=a" (a), "=b" (b), "=c" (c), "=d" (d) : "0" (1));
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return d;
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}
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void initsimd(int enable)
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{
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unsigned int cap = cpucapability();
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simd_enabled = (enable && (cap & 0x800000)) ? 1 : 0;
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logprintf(3, "x86 CPU capability %08x, MMX %s%sabled\n", cap, enable ? "" : "manually ",
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simd_enabled ? "en" : "dis");
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}
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#elif defined(USEVIS)
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unsigned int simd_enabled = 0;
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void initsimd(int enable)
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{
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simd_enabled = !!enable;
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logprintf(3, "VIS %sabled\n", simd_enabled ? "en" : "dis");
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}
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#endif
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