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checksse42.c
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checksse42.c
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/*
* Intel SSE 4.2 instruction probing implementation
*
* ICRAR - International Centre for Radio Astronomy Research
* (c) UWA - The University of Western Australia, 2014
* Copyright by UWA (in the framework of the ICRAR)
* All rights reserved
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include "common.h"
#if defined(IS_INTEL)
#if defined(_MSC_VER)
#include <intrin.h>
int _crc32c_intel_probe(void)
{
int info[4];
__cpuid(info, 1);
return (info[2] & (1 << 20)) != 0;
}
#elif defined(__GNUC__)
#include <cpuid.h>
int _crc32c_intel_probe(void)
{
unsigned int eax, ebx, ecx = 0, edx;
__get_cpuid(1, &eax, &ebx, &ecx, &edx);
return (ecx & (1 << 20)) != 0;
}
#else
int _crc32c_intel_probe(void) {
unsigned int ecx;
asm ("movl $1, %%eax;"
"cpuid;"
"movl %%ecx, %0;"
: "=r"(ecx) // outputs
: // inputs
: "eax", "ebx", "ecx", "edx"); // clobber
return (ecx & (1 << 20)) != 0;
}
#endif // defined(_MSC_VER)
#endif // defined(IS_INTEL)