cfg-big-switch.c source code [clang_source_code/INPUTS/cfg-big-switch.c]

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	}
28

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