57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
/*****************************************************************************
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* cpu.h: cpu detection
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*****************************************************************************
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* Copyright (C) 2004-2025 x264 project
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*
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* Authors: Loren Merritt <lorenm@u.washington.edu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at licensing@x264.com.
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*****************************************************************************/
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#ifndef X264_CPU_H
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#define X264_CPU_H
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X264_API uint32_t x264_cpu_detect( void );
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X264_API int x264_cpu_num_processors( void );
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void x264_cpu_emms( void );
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void x264_cpu_sfence( void );
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#if HAVE_MMX
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/* There is no way to forbid the compiler from using float instructions
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* before the emms so miscompilation could theoretically occur in the
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* unlikely event that the compiler reorders emms and float instructions. */
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#if HAVE_X86_INLINE_ASM
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/* Clobbering memory makes the compiler less likely to reorder code. */
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#define x264_emms() asm volatile( "emms":::"memory","st","st(1)","st(2)", \
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"st(3)","st(4)","st(5)","st(6)","st(7)" )
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#else
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#define x264_emms() x264_cpu_emms()
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#endif
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#else
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#define x264_emms()
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#endif
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#define x264_sfence x264_cpu_sfence
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typedef struct
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{
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const char *name;
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uint32_t flags;
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} x264_cpu_name_t;
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X264_API extern const x264_cpu_name_t x264_cpu_names[];
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#endif
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