gcc/testsuite/gcc.dg/i386-asm-2.c

   1 /* PR opt/13862 */
   2 /* { dg-do compile { target i?86-*-* } } */
   3 /* { dg-options "-O" } */
   4
   5 typedef struct _fame_syntax_t_ {
   6 } fame_syntax_t;
   7
   8 typedef struct _fame_bitbuffer_t_
   9 {
  10   unsigned char * base;
  11   unsigned char * data;
  12   unsigned long shift;
  13 } fame_bitbuffer_t;
  14
  15 #define fast_bitbuffer_write(data, shift, c, l)                         \
  16 {                                                                       \
  17   int d;                                                                \
  18                                                                         \
  19   asm("add %1, %%ecx\n"            /* ecx = shift + length */           \
  20       "shrd %%cl, %2, %3\n"        /* adjust code to fit in */          \
  21       "shr %%cl, %2\n"             /* adjust code to fit in */          \
  22       "mov %%ecx, %1\n"            /* shift += length */                \
  23       "bswap %2\n"                 /* reverse byte order of code */     \
  24       "shr $5, %%ecx\n"            /* get dword increment */            \
  25       "or %2, (%0)\n"              /* put first 32 bits */              \
  26       "bswap %3\n"                 /* reverse byte order of code */     \
  27       "lea   (%0, %%ecx, 4), %0\n" /* data += (ecx>32) */               \
  28       "andl $31, %1\n"             /* mask shift */                     \
  29       "orl %3, (%0)\n"             /* put last 32 bits */               \
  30       : "=r"(data), "=r"(shift), "=a"(d), "=d"(d), "=c"(d)              \
  31       : "0"(data), "1"(shift), "2"((unsigned long) c), "3"(0),          \
  32         "c"((unsigned long) l)                                          \
  33       : "memory");                                                      \
  34 }
  35
  36 #define bitbuffer_write(bb, c, l) \
  37   fast_bitbuffer_write((bb)->data, (bb)->shift, c, l)
  38
  39 typedef enum { frame_type_I, frame_type_P } frame_type_t;
  40
  41 typedef struct _fame_syntax_mpeg1_t_ {
  42   fame_bitbuffer_t buffer;
  43   frame_type_t frame_type;
  44 } fame_syntax_mpeg1_t;
  45
  46 #define FAME_SYNTAX_MPEG1(x) ((fame_syntax_mpeg1_t *) x)
  47
  48 void mpeg1_start_picture(fame_syntax_t *syntax)
  49 {
  50   fame_syntax_mpeg1_t *syntax_mpeg1 = FAME_SYNTAX_MPEG1(syntax);
  51   bitbuffer_write(&syntax_mpeg1->buffer, 0xFFFF, 16);
  52
  53   switch(syntax_mpeg1->frame_type) {
  54     case frame_type_I:
  55       bitbuffer_write(&syntax_mpeg1->buffer, 0, 1);
  56     break;
  57     case frame_type_P:
  58       bitbuffer_write(&syntax_mpeg1->buffer, 0, 1);
  59     break;
  60   }
  61 }