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x264 source for verification 2026-05-22

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admin
2026-05-22 16:45:04 +08:00
commit 4647f166e5
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/*****************************************************************************
* cpu.h: cpu detection
*****************************************************************************
* Copyright (C) 2004-2025 x264 project
*
* Authors: Loren Merritt <lorenm@u.washington.edu>
*
* 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 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at licensing@x264.com.
*****************************************************************************/
#ifndef X264_CPU_H
#define X264_CPU_H
X264_API uint32_t x264_cpu_detect( void );
X264_API int x264_cpu_num_processors( void );
void x264_cpu_emms( void );
void x264_cpu_sfence( void );
#if HAVE_MMX
/* There is no way to forbid the compiler from using float instructions
* before the emms so miscompilation could theoretically occur in the
* unlikely event that the compiler reorders emms and float instructions. */
#if HAVE_X86_INLINE_ASM
/* Clobbering memory makes the compiler less likely to reorder code. */
#define x264_emms() asm volatile( "emms":::"memory","st","st(1)","st(2)", \
"st(3)","st(4)","st(5)","st(6)","st(7)" )
#else
#define x264_emms() x264_cpu_emms()
#endif
#else
#define x264_emms()
#endif
#define x264_sfence x264_cpu_sfence
typedef struct
{
const char *name;
uint32_t flags;
} x264_cpu_name_t;
X264_API extern const x264_cpu_name_t x264_cpu_names[];
#endif