网站开发费用包括美工费吗,网站备案org,桦甸市建设局网站,安卓开发软件无符号mul和有符号imul#xff0c;在编译的过程中#xff0c;先尝试将乘法转换成加法 或使用移位指令等周期转移较短的指令#xff0c;如果都没有才用乘法指令 int main(int argc,char *argv)
{int nVarOne argc;int nVarTwo argc;// 变量乘常量 (非2的幂)printf(nV…无符号mul和有符号imul在编译的过程中先尝试将乘法转换成加法 或使用移位指令等周期转移较短的指令如果都没有才用乘法指令 int main(int argc,char *argv)
{int nVarOne argc;int nVarTwo argc;// 变量乘常量 (非2的幂)printf(nVarOne * 11 %d\n, nVarOne * 11);// 变量乘常量 (2的幂)printf(nVarOne * 16 %d\n, nVarOne * 16);// 常量*常量printf(55 * 11 %d\n, 55 * 11);// 复合运算printf(nVarOne * 8 5 %d\n, nVarOne * 8 5);// 变量*变量printf(nVarOne*nVarTwo %d\n, nVarOne*nVarTwo);std::cout Hello World!\n; system(pause);
} Debug版本反汇编 int main(int argc,char *argv)
{
008D2650 push ebp
008D2651 mov ebp,esp
008D2653 sub esp,0D8h
008D2659 push ebx
008D265A push esi
008D265B push edi
008D265C lea edi,[ebp-0D8h]
008D2662 mov ecx,36h
008D2667 mov eax,0CCCCCCCCh
008D266C rep stos dword ptr es:[edi]
008D266E mov ecx,offset _E6D683D6_mulcpp (08DE008h)
008D2673 call __CheckForDebuggerJustMyCode4 (08D1280h) int nVarOne argc;
008D2678 mov eax,dword ptr [argc]
008D267B mov dword ptr [nVarOne],eax int nVarTwo argc;
008D267E mov eax,dword ptr [argc]
008D2681 mov dword ptr [nVarTwo],eax // 变量乘常量 (非2的幂)printf(nVarOne * 11 %d\n, nVarOne * 11);
008D2684 imul eax,dword ptr [nVarOne],0Bh
008D2688 push eax
008D2689 push offset string nVarOne * 11 %d\n (08D9B30h)
008D268E call _printf (08D1055h)
008D2693 add esp,8 // 变量乘常量 (2的幂)printf(nVarOne * 16 %d\n, nVarOne * 16);
008D2696 mov eax,dword ptr [nVarOne]
008D2699 shl eax,4
008D269C push eax
008D269D push offset string nVarOne * 16 %d\n (08D9B48h)
008D26A2 call _printf (08D1055h)
008D26A7 add esp,8 // 常量*常量printf(55 * 11 %d\n, 55 * 11);
008D26AA push 25Dh
008D26AF push offset string 55 * 11 %d\n (08D9B60h)
008D26B4 call _printf (08D1055h)
008D26B9 add esp,8 // 复合运算printf(nVarOne * 8 5 %d\n, nVarOne * 8 5);
008D26BC mov eax,dword ptr [nVarOne]
008D26BF lea ecx,[eax*85]
008D26C6 push ecx
008D26C7 push offset string nVarOne * 8 5 %d\n (08D9B70h)
008D26CC call _printf (08D1055h)
008D26D1 add esp,8 // 变量*变量printf(nVarOne*nVarTwo %d\n, nVarOne*nVarTwo);
008D26D4 mov eax,dword ptr [nVarOne]
008D26D7 imul eax,dword ptr [nVarTwo]
008D26DB push eax
008D26DC push offset string nVarOne*nVarTwo %d\n (08D9B8Ch)
008D26E1 call _printf (08D1055h)
008D26E6 add esp,8 std::cout Hello World!\n;
008D26E9 push offset string Hello World!\n (08D9BA8h)
008D26EE mov eax,dword ptr [_imp_?coutstd3V?$basic_ostreamDU?$char_traitsDstd1A (08DD0C8h)]
008D26F3 push eax
008D26F4 call std::operatorstd::char_traitschar (08D1217h)
008D26F9 add esp,8 system(pause);
008D26FC mov esi,esp
008D26FE push offset string pause (08D9BB8h)
008D2703 call dword ptr [__imp__system (08DD1C4h)]
008D2709 add esp,4 system(pause);
008D270C cmp esi,esp
008D270E call __RTC_CheckEsp (08D128Ah)
} release版本通过ida查看 text:00401040 push ebp
.text:00401041 mov ebp, esp
.text:00401043 push esi
.text:00401044 mov esi, [ebpargc]
.text:00401047 imul eax, esi, 0Bh
.text:0040104A push eax
.text:0040104B push offset _Format ; nVarOne * 11 %d\n
.text:00401050 call _printf
.text:00401055 mov eax, esi
.text:00401057 shl eax, 4
.text:0040105A push eax
.text:0040105B push offset aNvarone16D ; nVarOne * 16 %d\n
.text:00401060 call _printf
.text:00401065 push 25Dh
.text:0040106A push offset a5511D ; 55 * 11 %d\n
.text:0040106F call _printf
.text:00401074 lea eax, ds:5[esi*8]
.text:0040107B push eax
.text:0040107C push offset aNvarone85D ; nVarOne * 8 5 %d\n
.text:00401081 call _printf
.text:00401086 imul esi, esi
.text:00401089 push esi
.text:0040108A push offset _Val ; nVarOne*nVarTwo %d\n
.text:0040108F call _printf
.text:00401094 mov ecx, ds:__imp_?coutstd3V?$basic_ostreamDU?$char_traitsDstd1A.gap0 ; _Ostr
.text:0040109A call ??$?6U?$char_traitsDstdstdYAAAV?$basic_ostreamDU?$char_traitsDstd0AAV10PBDZ ; std::operatorstd::char_traitschar(std::basic_ostreamchar,std::char_traitschar ,char const *)
.text:0040109F push offset Command ; pause 转载于:https://www.cnblogs.com/xiangtingshen/p/11163498.html
