1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*
An example of T_zu (zero upper) flag
> g++ zero_upper.cpp -I ../xbyak
> sde -future -- ./a.out
*/
#include <stdio.h>
#include <xbyak/xbyak.h>
using namespace Xbyak;
struct Code : Xbyak::CodeGenerator {
Code(int mode)
{
mov(eax, 0x12345678);
cmp(eax, eax); // ZF=1
switch (mode) {
case 0: // imul
puts("imul");
imul(ax,ax, 0x1234);
break;
case 1: // imul+zu
puts("imul+zu");
imul(ax|T_zu, ax, 0x1234);
break;
case 2: // setz
puts("setz");
setz(al);
break;
case 3: // setz+zu
puts("setz+zu");
setz(al|T_zu);
break;
}
ret();
}
};
int main()
try
{
for (int mode = 0; mode < 4; mode++) {
Code c(mode);
auto f = c.getCode<int (*)()>();
printf("ret=%08x\n", f());
}
} catch (std::exception& e) {
printf("ERR %s\n", e.what());
}
|
