mirror of
https://github.com/herumi/xbyak
synced 2024-11-21 16:09:11 -07:00
48 lines
797 B
C++
48 lines
797 B
C++
/*
|
|
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());
|
|
}
|