; Print the computer's clock speed once each second

.686
.mmx
.model flat
public _main
extern _printf: near
extern _time: near

.data
ticks dq 0  ; previous time in clock cycles
fmt db "%u %u",10,0

.code
_main:
        add esp, -12

; Wait until clock advances 1 second
L1:
        xor eax, eax
        mov [esp], eax
        call _time
        mov ebx, eax
L2:                     ; loop while time(0) == previous time(0) in ebx
        call _time
        cmp eax, ebx
        je L2

; Print clock count minus count from 1 second ago
        rdtsc
        mov ebx, eax
        mov ecx, edx
        sub eax, dword ptr [ticks]
        sbb edx, dword ptr [ticks+4]
        mov dword ptr [ticks], ebx
        mov dword ptr [ticks+4], ecx
        mov [esp], offset fmt
        mov [esp+4], edx
        mov [esp+8], eax
        call _printf
        jmp L1
end