28 lines
1.4 KiB
C
28 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;
|
|
}
|