diff options
Diffstat (limited to 'clang/INPUTS/cfg-big-switch.c')
| -rw-r--r-- | clang/INPUTS/cfg-big-switch.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/clang/INPUTS/cfg-big-switch.c b/clang/INPUTS/cfg-big-switch.c new file mode 100644 index 0000000..a48b51a --- /dev/null +++ b/clang/INPUTS/cfg-big-switch.c @@ -0,0 +1,27 @@ +#define EXPAND_2_CASES(i, x, y) CASE(i, x, y); CASE(i + 1, x, y); +#define EXPAND_4_CASES(i, x, y) EXPAND_2_CASES(i, x, y) EXPAND_2_CASES(i + 2, x, y) +#define EXPAND_8_CASES(i, x, y) EXPAND_4_CASES(i, x, y) EXPAND_4_CASES(i + 4, x, y) +#define EXPAND_16_CASES(i, x, y) EXPAND_8_CASES(i, x, y) EXPAND_8_CASES(i + 8, x, y) +#define EXPAND_32_CASES(i, x, y) EXPAND_16_CASES(i, x, y) EXPAND_16_CASES(i + 16, x, y) +#define EXPAND_64_CASES(i, x, y) EXPAND_32_CASES(i, x, y) EXPAND_32_CASES(i + 32, x, y) +#define EXPAND_128_CASES(i, x, y) EXPAND_64_CASES(i, x, y) EXPAND_64_CASES(i + 64, x, y) +#define EXPAND_256_CASES(i, x, y) EXPAND_128_CASES(i, x, y) EXPAND_128_CASES(i + 128, x, y) +#define EXPAND_512_CASES(i, x, y) EXPAND_256_CASES(i, x, y) EXPAND_256_CASES(i + 256, x, y) +#define EXPAND_1024_CASES(i, x, y) EXPAND_512_CASES(i, x, y) EXPAND_512_CASES(i + 512, x, y) +#define EXPAND_2048_CASES(i, x, y) EXPAND_1024_CASES(i, x, y) EXPAND_1024_CASES(i + 1024, x, y) +#define EXPAND_4096_CASES(i, x, y) EXPAND_2048_CASES(i, x, y) EXPAND_2048_CASES(i + 2048, x, y) + +// This has a *monstrous* single fan-out in the CFG, across 8000 blocks inside +// the while loop. +unsigned cfg_big_switch(int x) { + unsigned y = 0; + while (x > 0) { + switch(x) { +#define CASE(i, x, y) \ + case i: { int case_var = 3*x + i; y += case_var - 1; break; } +EXPAND_4096_CASES(0, x, y); + } + --x; + } + return y; +} |