1  /* PR opt/13862 */
       2  /* { dg-do compile } */
       3  /* { dg-require-effective-target ilp32 } */
       4  /* { dg-options "-O" } */
       5  
       6  typedef struct _fame_syntax_t_ {
       7  } fame_syntax_t;
       8  
       9  typedef struct _fame_bitbuffer_t_
      10  {
      11    unsigned char * base;
      12    unsigned char * data;
      13    unsigned long shift;
      14  } fame_bitbuffer_t;
      15  
      16  #define fast_bitbuffer_write(data, shift, c, l)				\
      17  {									\
      18    int d;								\
      19  									\
      20    asm("add %1, %%ecx\n"            /* ecx = shift + length */		\
      21        "shrd %%cl, %2, %3\n"        /* adjust code to fit in */		\
      22        "shr %%cl, %2\n"             /* adjust code to fit in */		\
      23        "mov %%ecx, %1\n"            /* shift += length */		\
      24        "bswap %2\n"                 /* reverse byte order of code */	\
      25        "shr $5, %%ecx\n"            /* get dword increment */            \
      26        "or %2, (%0)\n"              /* put first 32 bits */		\
      27        "bswap %3\n"                 /* reverse byte order of code */	\
      28        "lea   (%0, %%ecx, 4), %0\n" /* data += (ecx>32) */		\
      29        "andl $31, %1\n"             /* mask shift */			\
      30        "orl %3, (%0)\n"             /* put last 32 bits */		\
      31        : "=r"(data), "=r"(shift), "=a"(d), "=d"(d), "=c"(d)		\
      32        : "0"(data), "1"(shift), "2"((unsigned long) c), "3"(0),		\
      33  	"c"((unsigned long) l)						\
      34        : "memory");							\
      35  }
      36  
      37  #define bitbuffer_write(bb, c, l) \
      38    fast_bitbuffer_write((bb)->data, (bb)->shift, c, l)
      39  
      40  typedef enum { frame_type_I, frame_type_P } frame_type_t;
      41  
      42  typedef struct _fame_syntax_mpeg1_t_ {
      43    fame_bitbuffer_t buffer;
      44    frame_type_t frame_type;
      45  } fame_syntax_mpeg1_t;
      46  
      47  #define FAME_SYNTAX_MPEG1(x) ((fame_syntax_mpeg1_t *) x)
      48  
      49  void mpeg1_start_picture(fame_syntax_t *syntax)
      50  {
      51    fame_syntax_mpeg1_t *syntax_mpeg1 = FAME_SYNTAX_MPEG1(syntax);
      52    bitbuffer_write(&syntax_mpeg1->buffer, 0xFFFF, 16); 
      53  
      54    switch(syntax_mpeg1->frame_type) {
      55      case frame_type_I:
      56        bitbuffer_write(&syntax_mpeg1->buffer, 0, 1);  
      57      break;
      58      case frame_type_P:
      59        bitbuffer_write(&syntax_mpeg1->buffer, 0, 1);
      60      break;
      61    }
      62  }