49 lines
797 B
C++
49 lines
797 B
C++
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/*
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An example of T_zu (zero upper) flag
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> g++ zero_upper.cpp -I ../xbyak
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> sde -future -- ./a.out
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*/
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#include <stdio.h>
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#include <xbyak/xbyak.h>
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using namespace Xbyak;
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struct Code : Xbyak::CodeGenerator {
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Code(int mode)
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{
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mov(eax, 0x12345678);
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cmp(eax, eax); // ZF=1
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switch (mode) {
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case 0: // imul
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puts("imul");
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imul(ax,ax, 0x1234);
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break;
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case 1: // imul+zu
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puts("imul+zu");
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imul(ax|T_zu, ax, 0x1234);
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break;
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case 2: // setz
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puts("setz");
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setz(al);
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break;
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case 3: // setz+zu
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puts("setz+zu");
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setz(al|T_zu);
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break;
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}
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ret();
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}
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};
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int main()
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try
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{
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for (int mode = 0; mode < 4; mode++) {
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Code c(mode);
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auto f = c.getCode<int (*)()>();
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printf("ret=%08x\n", f());
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}
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} catch (std::exception& e) {
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printf("ERR %s\n", e.what());
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}
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