minix/external/bsd/llvm/dist/clang/INPUTS/cfg-big-switch.c
Lionel Sambuc f4a2713ac8 Importing netbsd clang -- pristine
Change-Id: Ia40e9ffdf29b5dab2f122f673ff6802a58bc690f
2014-07-28 17:05:57 +02:00

27 lines
1.4 KiB
C

#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;
}