2823a4c8 |
1 | // Betting on GCC aligning this for efficiency.\r |
2 | #include <stdio.h>\r |
3 | \r |
4 | int main()\r |
5 | {\r |
6 | unsigned short int read_16 = 0xF1F2;\r |
7 | unsigned int read_32 = 0xF1F2F3F4;\r |
8 | \r |
9 | unsigned short int write_16 = 0xF00D;\r |
10 | unsigned int write_32 = 0xF00DFEED;\r |
11 | // 16bit unsigned reads, we expect 0xF1F2 and 0xF20000F1\r |
12 | fprintf(stderr, "%04x %04x\n",\r |
13 | *((unsigned short int *)((char *)&read_16)),\r |
14 | *((unsigned short int *)((char *)&read_16 + 1)));\r |
15 | \r |
16 | // 16bit signed reads, we expect 0xFFFFF1F2 and 0xFFFFFFF1\r |
17 | fprintf(stderr, "%04x %04x\n",\r |
18 | *((short int *)((char *)&read_16)),\r |
19 | *((short int *)((char *)&read_16 + 1)));\r |
20 | \r |
21 | // 32bit reads, we expect 0xF1F2F3F4, 0xF4F1F2F3, 0xF3F4F1F2,\r |
22 | // and 0xF2F3F4F1\r |
23 | \r |
24 | fprintf(stderr, "%08x %08x %08x %08x\n",\r |
25 | *((int *)((char *)&read_32)),\r |
26 | *((int *)((char *)&read_32 + 1)),\r |
27 | *((int *)((char *)&read_32 + 2)),\r |
28 | *((int *)((char *)&read_32 + 3)));\r |
29 | \r |
30 | // 16bit writes, we expect write_16 to remain 0xF00D\r |
31 | \r |
32 | *((short int *)((char *)&write_16)) = 0xF00D;\r |
33 | *((short int *)((char *)&write_16) + 1) = 0xF00D;\r |
34 | \r |
35 | fprintf(stderr, "%04x\n", write_16);\r |
36 | \r |
37 | // 32bit writes, we expect write_32 to remain 0xF00DFEED\r |
38 | \r |
39 | *((int *)((char *)&write_16)) = 0xF00DFEED;\r |
40 | *((int *)((char *)&write_16) + 1) = 0xF00DFEED;\r |
41 | *((int *)((char *)&write_16) + 2) = 0xF00DFEED;\r |
42 | *((int *)((char *)&write_16) + 3) = 0xF00DFEED;\r |
43 | \r |
44 | fprintf(stderr, "%08x\n", write_32);\r |
45 | \r |
46 | return 0;\r |
47 | }\r |
48 | \r |