common/cpu.h

   1 /*****************************************************************************
   2  * cpu.h: h264 encoder library
   3  *****************************************************************************
   4  * Copyright (C) 2004-2008 Loren Merritt <lorenm@u.washington.edu>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
  19  *****************************************************************************/
  20
  21 #ifndef X264_CPU_H
  22 #define X264_CPU_H
  23
  24 uint32_t x264_cpu_detect( void );
  25 int      x264_cpu_num_processors( void );
  26 void     x264_emms( void );
  27 void     x264_cpu_mask_misalign_sse( void );
  28
  29 /* kluge:
  30  * gcc can't give variables any greater alignment than the stack frame has.
  31  * We need 16 byte alignment for SSE2, so here we make sure that the stack is
  32  * aligned to 16 bytes.
  33  * gcc 4.2 introduced __attribute__((force_align_arg_pointer)) to fix this
  34  * problem, but I don't want to require such a new version.
  35  * This applies only to x86_32, since other architectures that need alignment
  36  * also have ABIs that ensure aligned stack. */
  37 #if defined(ARCH_X86) && defined(HAVE_MMX)
  38 void x264_stack_align( void (*func)(x264_t*), x264_t *arg );
  39 #else
  40 #define x264_stack_align(func,arg) func(arg)
  41 #endif
  42
  43 typedef struct {
  44     const char name[16];
  45     int flags;
  46 } x264_cpu_name_t;
  47 extern const x264_cpu_name_t x264_cpu_names[];
  48
  49 #endif