cpu.c

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/*
 *
 *
 * ***** 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;
}