#include #include using namespace std; int add(int n, int m){ int val ; asm ("movl %1, %%ebx;" "movl %2, %%eax;" "addl %%ebx, %%eax;" "movl %%eax, %0" : "=r" ( val ) : "r" (m), "r" (n) : "%ebx","%eax"); return val; } int sub(int n,int m){ int val ; asm ("movl %1, %%ebx;" "movl %2, %%eax;" "subl %%ebx, %%eax;" "movl %%eax, %0" : "=r" ( val ) : "r" (m), "r" (n) : "%ebx","%eax"); return val; } int mult(int n, int m){ int val ; asm ("movl %1, %%eax;" "movl %2, %%ebx;" "imull %%ebx, %%eax;" "movl %%eax, %0" : "=r" ( val ) //output : "r" (m), "r" (n) //inputs : "%ebx","%eax"); //clobbered regs return val; } int divide(int n, int m){ int val ; asm ("movl %2, %%eax;" "movl %1, %%ebx;" "movl $0, %%edx;" "idivl %%ebx;" "movl %%eax, %0" : "=r" ( val ) //output : "r" (m), "r" (n) //inputs : "%ebx","%eax", "%edx"); //clobbered regs return val; } float fadd(float n, float m){ double val ; asm ( "fld %2;" "fld %1;" "faddp;" "fstl %0;" : "=m" (val) : "m" (m), "m" (n) : ); return val; } float fsub(float n, float m){ double val ; asm ( "fld %1;" "fld %2;" "fsubp;" "fstl %0;" : "=m" (val) : "m" (m), "m" (n) : ); return val; } float fmult(float n, float m){ double val ; asm ( "fld %1;" "fld %2;" "fmulp;" "fstl %0;" : "=m" (val) : "g" (m), "g" (n) : ); return val; } float fdiv(float n, float m){ double val ; asm ( "fld %1;" "fld %2;" "fdivp;" "fstl %0;" : "=m" (val) : "g" (m), "g" (n) : ); return val; } // as per https://wiki.osdev.org/CPUID // When called with EAX = 0, CPUID returns the vendor ID string in EBX, EDX and ECX. (<-in this order) void cpuid(){ int b,c,d; asm(R"( movl $0, %%eax; cpuid; )" :"=b"(b),"=c"(c),"=d"(d) ); cout << "Vendor name: "; vector name{b,d,c}; for(auto & n: name){ const char * cp = reinterpret_cast(&n); for(int i=0;i<4;++i) cout << *(cp+i); } } int main() { cout<

Extended Assembly Basic Arithmetics