cpu.c

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/*
 *
 * $Id: cpu.c 35246 2011-02-27 20:37:56Z jesterking $
 *
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. 
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "BLI_cpu.h"

int BLI_cpu_support_sse2(void)
{
#if defined(__x86_64__) || defined(_M_X64)
        /* x86_64 always has SSE2 instructions */
        return 1;
#elif defined(__GNUC__) && defined(i386)
        /* for GCC x86 we check cpuid */
        unsigned int d;
        __asm__(
                "pushl %%ebx\n\t"
                "cpuid\n\t"
                "popl %%ebx\n\t"
              : "=d"(d)
                  : "a"(1));
        return (d & 0x04000000) != 0;
#elif (defined(_MSC_VER) && defined(_M_IX86))
        /* also check cpuid for MSVC x86 */
        unsigned int d;
        __asm {
                xor     eax, eax
                inc     eax
                push    ebx
                cpuid
                pop     ebx
                mov     d, edx
        }
        return (d & 0x04000000) != 0;
#endif

        return 0;
}