1  /* { dg-skip-if "exceeds eBPF stack limit" { bpf-*-* } } */
       2  
       3  typedef signed char int8_t;
       4  typedef short int16_t;
       5  typedef unsigned char uint8_t;
       6  typedef unsigned int uint32_t;
       7  
       8  union unaligned_32 {uint32_t l;} __attribute__((packed)) __attribute__((may_alias));
       9  static inline uint32_t NEG_USR32(uint32_t a, int8_t s){return a << (32 - s);}
      10  typedef struct GetBitContext { const uint8_t *buffer, *buffer_end; int index;}GetBitContext;
      11  typedef struct VLC {int16_t (*table)[2];} VLC;
      12  static __attribute__((always_inline)) inline int get_vlc2(GetBitContext *s, int16_t (*table)[2], int bits, int max_depth) {
      13      unsigned int re_index= (s)->index;
      14      int re_cache= 0;
      15      {
      16          int n, nb_bits;
      17          unsigned int index;
      18          index= NEG_USR32(re_cache, bits);
      19          n = table[index][1];
      20          if(max_depth > 1 && n < 0){
      21              re_cache= bswap_32((((const union unaligned_32 *) (((const uint8_t *)(s)->buffer)+(re_index>>3)))->l)) << (re_index&0x07);
      22          }
      23      }
      24  }
      25  typedef struct HYuvContext{GetBitContext gb; int decorrelate; int bitstream_bpp; uint8_t *temp[3]; VLC vlc[6];} HYuvContext;
      26  static __attribute__((always_inline)) inline void decode_bgr_1(HYuvContext *s, int count, int decorrelate, int alpha){
      27      int i;
      28          int code = get_vlc2(&s->gb, s->vlc[3].table, 11, 1);
      29          if(code != -1){
      30              s->temp[0][4*i+0] = get_vlc2(&s->gb, s->vlc[0].table, 11, 3);
      31              s->temp[0][4*i+1] = get_vlc2(&s->gb, s->vlc[1].table, 11, 3);
      32              s->temp[0][4*i+2] = get_vlc2(&s->gb, s->vlc[2].table, 11, 3);
      33          }
      34  }
      35  void decode_bgr_bitstream(HYuvContext *s, int count){
      36      if(s->decorrelate){
      37          if(s->bitstream_bpp==24) decode_bgr_1(s, count, 1, 0);
      38          else             decode_bgr_1(s, count, 1, 1);
      39      }
      40  }