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      1 #define EXPAND_2_BRANCHES(i, x, y)    BRANCH(i, x, y);              BRANCH(i + 1, x, y);
      2 #define EXPAND_4_BRANCHES(i, x, y)    EXPAND_2_BRANCHES(i, x, y)    EXPAND_2_BRANCHES(i + 2, x, y)
      3 #define EXPAND_8_BRANCHES(i, x, y)    EXPAND_4_BRANCHES(i, x, y)    EXPAND_4_BRANCHES(i + 4, x, y)
      4 #define EXPAND_16_BRANCHES(i, x, y)   EXPAND_8_BRANCHES(i, x, y)    EXPAND_8_BRANCHES(i + 8, x, y)
      5 #define EXPAND_32_BRANCHES(i, x, y)   EXPAND_16_BRANCHES(i, x, y)   EXPAND_16_BRANCHES(i + 16, x, y)
      6 #define EXPAND_64_BRANCHES(i, x, y)   EXPAND_32_BRANCHES(i, x, y)   EXPAND_32_BRANCHES(i + 32, x, y)
      7 #define EXPAND_128_BRANCHES(i, x, y)  EXPAND_64_BRANCHES(i, x, y)   EXPAND_64_BRANCHES(i + 64, x, y)
      8 #define EXPAND_256_BRANCHES(i, x, y)  EXPAND_128_BRANCHES(i, x, y)  EXPAND_128_BRANCHES(i + 128, x, y)
      9 #define EXPAND_512_BRANCHES(i, x, y)  EXPAND_256_BRANCHES(i, x, y)  EXPAND_256_BRANCHES(i + 256, x, y)
     10 #define EXPAND_1024_BRANCHES(i, x, y) EXPAND_512_BRANCHES(i, x, y)  EXPAND_512_BRANCHES(i + 512, x, y)
     11 #define EXPAND_2048_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i, x, y) EXPAND_1024_BRANCHES(i + 1024, x, y)
     12 #define EXPAND_4096_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i, x, y) EXPAND_2048_BRANCHES(i + 2048, x, y)
     13 
     14 unsigned cfg_long_chain_single_exit(unsigned x) {
     15   unsigned y = 0;
     16 #define BRANCH(i, x, y) if ((x % 13171) < i) { int var = x / 13171; y ^= var; }
     17   EXPAND_4096_BRANCHES(1, x, y);
     18 #undef BRANCH
     19   return y;
     20 }
     21