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1 | int sub_test() |
2 | { |
3 | u32 eax; |
4 | u32 ebx; |
5 | u32 ecx; |
6 | u32 edx; |
7 | u32 esi; |
8 | u32 edi; |
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9 | u32 cond_c; |
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10 | u32 cond_z; |
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11 | u64 tmp64; |
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12 | |
13 | ebx = 0x10000; |
14 | esi = 0x20000; |
15 | edi = 0x30000; |
16 | ecx = 0x0a; |
17 | |
18 | loop: |
19 | LOBYTE(eax) = *(u8 *)esi; esi += 1; // lods |
20 | LOBYTE(eax) = *(u8 *)(ebx + LOBYTE(eax)); // xlat |
21 | *(u8 *)edi = eax; edi += 1; // stos |
22 | LOWORD(eax) = *(u16 *)esi; esi += 2; // lods |
23 | LOWORD(eax) = -(s16)(u16)eax; |
24 | *(u16 *)edi = eax; edi += 2; // stos |
25 | eax = *(u32 *)esi; esi += 4; // lods |
26 | *(u32 *)edi = eax; edi += 4; // stos |
27 | *(u8 *)edi = *(u8 *)esi; edi += 1; esi += 1; // movs |
28 | cond_z = (*(u16 *)esi == *(u16 *)edi); esi += 2; edi += 2; // cmps |
29 | cond_z = ((u8)eax == *(u8 *)edi); edi += 1; // scas |
30 | if (--ecx != 0) |
31 | goto loop; // loop |
32 | *(u8 *)edi = eax; edi -= 1; // stos |
33 | *(u16 *)edi = eax; edi -= 2; // stos |
34 | *(u32 *)edi = eax; edi -= 4; // stos |
35 | edx = (s32)eax >> 31; // cdq |
36 | eax = ecx ? __builtin_ffs(ecx) - 1 : 0; // bsf |
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37 | tmp64 = ((u64)edx << 32) | eax; |
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38 | tmp64 = (s64)tmp64 << LOBYTE(ecx); |
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39 | edx = tmp64 >> 32; eax = tmp64; // allshl |
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40 | edi = eax; |
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41 | tmp64 = ((u64)edx << 32) | eax; |
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42 | tmp64 = (s64)tmp64 >> LOBYTE(ecx); |
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43 | edx = tmp64 >> 32; eax = tmp64; // allshr |
44 | eax = __builtin_bswap32(eax); |
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45 | ecx ^= eax; |
46 | tmp64 = (u64)eax + ecx; |
47 | cond_c = tmp64 >> 32; |
48 | eax = (u32)tmp64; |
49 | cond_z = (eax == 0); // add64 |
50 | while (ecx != 0) { |
51 | cond_c = *(u8 *)esi < *(u8 *)edi; |
52 | cond_z = (*(u8 *)esi == *(u8 *)edi); esi += 1, edi += 1; |
53 | ecx--; |
54 | if (cond_z != 0) break; |
55 | } // repne cmps |
56 | LOBYTE(ecx) = (!cond_z); |
57 | LOBYTE(ecx) += (u8)ecx + cond_c; |
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58 | eax = 1; |
59 | return eax; |
60 | } |
61 | |