modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/compile/20070520-1.c (about)

     1  typedef unsigned char uint8_t;
     2  extern uint8_t ff_cropTbl[256 + 2 * 1024];
     3  
     4  void ff_pred8x8_plane_c(uint8_t *src, int stride){
     5    int j, k;
     6    int a;
     7    uint8_t *cm = ff_cropTbl + 1024;
     8    const uint8_t * const src0 = src+3-stride;
     9    const uint8_t *src1 = src+4*stride-1;
    10    const uint8_t *src2 = src1-2*stride;
    11    int H = src0[1] - src0[-1];
    12    int V = src1[0] - src2[ 0];
    13    for(k=2; k<=4; ++k) {
    14      src1 += stride; src2 -= stride;
    15      H += k*(src0[k] - src0[-k]);
    16      V += k*(src1[0] - src2[ 0]);
    17    }
    18    H = ( 17*H+16 ) >> 5;
    19    V = ( 17*V+16 ) >> 5;
    20  
    21    a = 16*(src1[0] + src2[8]+1) - 3*(V+H);
    22    for(j=8; j>0; --j) {
    23      int b = a;
    24      a += V;
    25      src[0] = cm[ (b ) >> 5 ];
    26      src[1] = cm[ (b+ H) >> 5 ];
    27      src[2] = cm[ (b+2*H) >> 5 ];
    28      src[3] = cm[ (b+3*H) >> 5 ];
    29      src[4] = cm[ (b+4*H) >> 5 ];
    30      src[5] = cm[ (b+5*H) >> 5 ];
    31      src[6] = cm[ (b+6*H) >> 5 ];
    32      src[7] = cm[ (b+7*H) >> 5 ];
    33      src += stride;
    34    }
    35  }