cpu.c
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上传用户:hjq518
上传日期:2021-12-09
资源大小:5084k
文件大小:3k
源码类别:
Audio
开发平台:
Visual C++
- /*****************************************************************************
- * cpu.c: h264 encoder library
- *****************************************************************************
- * Copyright (C) 2003 Laurent Aimar
- * $Id: cpu.c,v 1.1 2004/06/03 19:27:06 fenrir 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 <string.h>
- #include "common.h"
- #if defined(ARCH_X86) || defined(ARCH_X86_64)
- extern int x264_cpu_cpuid_test( void );
- extern uint32_t x264_cpu_cpuid( uint32_t op, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx );
- extern void x264_emms( void );
- uint32_t x264_cpu_detect( void )
- {
- uint32_t cpu = 0;
- uint32_t eax, ebx, ecx, edx;
- int b_amd;
- if( !x264_cpu_cpuid_test() )
- {
- /* No cpuid */
- return 0;
- }
- x264_cpu_cpuid( 0, &eax, &ebx, &ecx, &edx);
- if( eax == 0 )
- {
- return 0;
- }
- b_amd = (ebx == 0x68747541) && (ecx == 0x444d4163) && (edx == 0x69746e65);
- x264_cpu_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;
- }
- x264_cpu_cpuid( 0x80000000, &eax, &ebx, &ecx, &edx );
- if( eax < 0x80000001 )
- {
- /* no extended capabilities */
- return cpu;
- }
- x264_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) )
- {
- x264_emms();
- }
- }
- #elif defined( ARCH_PPC )
- #ifdef SYS_MACOSX
- #include <sys/sysctl.h>
- uint32_t x264_cpu_detect( void )
- {
- /* Thank you 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;
- }
- #elif defined( SYS_LINUX )
- uint32_t x264_cpu_detect( void )
- {
- /* FIXME (Linux PPC) */
- return X264_CPU_ALTIVEC;
- }
- #endif
- void x264_cpu_restore( uint32_t cpu )
- {
- }
- #else
- uint32_t x264_cpu_detect( void )
- {
- return 0;
- }
- void x264_cpu_restore( uint32_t cpu )
- {
- }
- #endif