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
cfg_long_chain_single_exit(unsigned x)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