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.text:00401437 mov ecx, 1Ch ; ecx = 28 (counter) .text:0040143C .text:0040143C get_byte: .text:0040143C .text:0040143C shr ebx, 22 May 2017 x86 Instructions. For example, LEA eax, [esi+4] means eax = esi + 4. It is typically followed by a conditional jump instruction that tests theTEST (x86 instruction) In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF , ZF , PF are modified while the result of the AND is discarded. The OF and CF flags are set to 0 , while AF flag is undefined. Examples. test eax, eax ; test if eax=0 jz short loc_402B13 ; if condition is met, jump to loc_402B13 dec ecx jz counter_is_now_zero eax stores the result of the function cmp [ebp+var_4], 0 ; test if function return is 0 jnz short loc_4010E5 ; if function InternetReadFile x86 assembly tutorials, x86 opcode reference, programming, pastebin with syntax A8 ib, TEST AL,imm8, AND imm8 with AL; set SF, ZF, PF according to result. 22 May 2017 So Test EDX, 200 will AND the value in EDX with 0x200 and set ZF to 1 if the result of x86 assembly instructions named according to the name of the instruction: To find out what some other instruction does, for example cmpxchg , all you According to the x86 Instruction Set Reference entry for TEST found at [TEST] computes the bit-wise logical AND of first operand (source 1 13 Mar 1997 The TEST instruction performs a logical "AND" which sets the flag registers but .. definately a Newbie with a capital N. For example the x86