cpu.h 2.33 KB
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/*****************************************************************************
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 * cpu.h: cpu detection
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 *****************************************************************************
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 * Copyright (C) 2004-2011 x264 project
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 *
 * Authors: Loren Merritt <lorenm@u.washington.edu>
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 *
 * 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
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
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 *
 * This program is also available under a commercial proprietary license.
 * For more information, contact us at licensing@x264.com.
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 *****************************************************************************/

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#ifndef X264_CPU_H
#define X264_CPU_H
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uint32_t x264_cpu_detect( void );
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int      x264_cpu_num_processors( void );
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void     x264_cpu_emms( void );
void     x264_cpu_sfence( void );
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#if HAVE_MMX
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#define x264_emms() x264_cpu_emms()
#else
#define x264_emms()
#endif
#define x264_sfence x264_cpu_sfence
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void     x264_cpu_mask_misalign_sse( void );
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/* kluge:
 * gcc can't give variables any greater alignment than the stack frame has.
 * We need 16 byte alignment for SSE2, so here we make sure that the stack is
 * aligned to 16 bytes.
 * gcc 4.2 introduced __attribute__((force_align_arg_pointer)) to fix this
 * problem, but I don't want to require such a new version.
 * This applies only to x86_32, since other architectures that need alignment
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 * either have ABIs that ensure aligned stack, or don't support it at all. */
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#if ARCH_X86 && HAVE_MMX
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int x264_stack_align( void (*func)(), ... );
#define x264_stack_align(func,...) x264_stack_align((void (*)())func, __VA_ARGS__)
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#else
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#define x264_stack_align(func,...) func(__VA_ARGS__)
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#endif

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typedef struct
{
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    const char name[16];
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    int flags;
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} x264_cpu_name_t;
extern const x264_cpu_name_t x264_cpu_names[];
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#endif