/***************************************************************************** * cpu.c: h264 encoder library ***************************************************************************** * Copyright (C) 2003 Laurent Aimar * $Id: cpu.c,v 1.4 2004/03/09 12:27:13 titer Exp $ * * Authors: Laurent Aimar <fenrir@via.ecp.fr> * * 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA. *****************************************************************************/#include <stdlib.h>#include <string.h>#include <stdint.h>#include "../x264.h"#include "cpu.h"#ifdef ARCH_X86/* * XXX: adapted from libmpeg2 */#define cpuid(op,eax,ebx,ecx,edx)   \    __asm__ ("push %%ebx\n\t"       \             "cpuid\n\t"            \             "movl %%ebx,%1\n\t"    \             "pop %%ebx"        \             : "=a" (eax),      \               "=r" (ebx),      \               "=c" (ecx),      \               "=d" (edx)       \             : "a" (op)         \             : "cc")uint32_t x264_cpu_detect( void ){    uint32_t cpu = 0;    uint32_t eax, ebx, ecx, edx;    int      b_amd;    /* Test if cpuid is supported */    asm volatile(        "pushf\n"        "pushf\n"        "pop %0\n"        "movl %0,%1\n"        "xorl $0x200000,%0\n"        "push %0\n"        "popf\n"        "pushf\n"        "pop %0\n"        "popf\n"         : "=r" (eax), "=r" (ebx) : : "cc");    if( eax == ebx )    {        /* No cpuid */        return 0;    }    cpuid( 0, eax, ebx, ecx, edx);    if( eax == 0 )    {        return 0;    }    b_amd   = (ebx == 0x68747541) && (ecx == 0x444d4163) && (edx == 0x69746e65);    cpuid( 1, eax, ebx, ecx, edx );    if( (edx&0x00800000) == 0 )    {        /* No MMX */        return 0;    }    cpu = X264_CPU_MMX;    if( (edx&0x02000000) )    {        /* SSE - identical to AMD MMX extensions */        cpu |= X264_CPU_MMXEXT|X264_CPU_SSE;    }    if( (edx&0x04000000) )    {        /* Is it OK ? */        cpu |= X264_CPU_SSE2;    }    cpuid( 0x80000000, eax, ebx, ecx, edx );    if( eax < 0x80000001 )    {        /* no extended capabilities */        return cpu;    }    cpuid( 0x80000001, eax, ebx, ecx, edx );    if( edx&0x80000000 )    {        cpu |= X264_CPU_3DNOW;    }    if( b_amd && (edx&0x00400000) )    {        /* AMD MMX extensions */        cpu |= X264_CPU_MMXEXT;    }    return cpu;}void     x264_cpu_restore( uint32_t cpu ){    if( cpu&(X264_CPU_MMX|X264_CPU_MMXEXT|X264_CPU_3DNOW|X264_CPU_3DNOWEXT) )    {        asm volatile( "emms" : : );    }}#elif defined( HAVE_ALTIVEC )#include <sys/sysctl.h>uint32_t x264_cpu_detect( void ){    /* Thx VLC */    uint32_t cpu = 0;    int      selectors[2] = { CTL_HW, HW_VECTORUNIT };    int      has_altivec = 0;    size_t   length = sizeof( has_altivec );    int      error = sysctl( selectors, 2, &has_altivec, &length, NULL, 0 );    if( error == 0 && has_altivec != 0 )    {        cpu |= X264_CPU_ALTIVEC;    }    return cpu;}void     x264_cpu_restore( uint32_t cpu ){}#elseuint32_t x264_cpu_detect( void ){    return 0;}void     x264_cpu_restore( uint32_t cpu ){}#endif