| Chandler Carruth | fd8bcd2 | 2011-07-08 11:20:51 +0000 | [diff] [blame] | 1 | #define EXPAND_2_CASES(i, x, y) CASE(i, x, y); CASE(i + 1, x, y); |
| 2 | #define EXPAND_4_CASES(i, x, y) EXPAND_2_CASES(i, x, y) EXPAND_2_CASES(i + 2, x, y) |
| 3 | #define EXPAND_8_CASES(i, x, y) EXPAND_4_CASES(i, x, y) EXPAND_4_CASES(i + 4, x, y) |
| 4 | #define EXPAND_16_CASES(i, x, y) EXPAND_8_CASES(i, x, y) EXPAND_8_CASES(i + 8, x, y) |
| 5 | #define EXPAND_32_CASES(i, x, y) EXPAND_16_CASES(i, x, y) EXPAND_16_CASES(i + 16, x, y) |
| 6 | #define EXPAND_64_CASES(i, x, y) EXPAND_32_CASES(i, x, y) EXPAND_32_CASES(i + 32, x, y) |
| 7 | #define EXPAND_128_CASES(i, x, y) EXPAND_64_CASES(i, x, y) EXPAND_64_CASES(i + 64, x, y) |
| 8 | #define EXPAND_256_CASES(i, x, y) EXPAND_128_CASES(i, x, y) EXPAND_128_CASES(i + 128, x, y) |
| 9 | #define EXPAND_512_CASES(i, x, y) EXPAND_256_CASES(i, x, y) EXPAND_256_CASES(i + 256, x, y) |
| 10 | #define EXPAND_1024_CASES(i, x, y) EXPAND_512_CASES(i, x, y) EXPAND_512_CASES(i + 512, x, y) |
| 11 | #define EXPAND_2048_CASES(i, x, y) EXPAND_1024_CASES(i, x, y) EXPAND_1024_CASES(i + 1024, x, y) |
| 12 | #define EXPAND_4096_CASES(i, x, y) EXPAND_2048_CASES(i, x, y) EXPAND_2048_CASES(i + 2048, x, y) |
| 13 | |
| 14 | // This has a *monstrous* single fan-out in the CFG, across 8000 blocks inside |
| 15 | // the while loop. |
| 16 | unsigned cfg_big_switch(int x) { |
| 17 | unsigned y = 0; |
| 18 | while (x > 0) { |
| 19 | switch(x) { |
| 20 | #define CASE(i, x, y) \ |
| 21 | case i: { int case_var = 3*x + i; y += case_var - 1; break; } |
| 22 | EXPAND_4096_CASES(0, x, y); |
| 23 | } |
| 24 | --x; |
| 25 | } |
| 26 | return y; |
| 27 | } |