The variables are double-digit variables. The following program displays the largest of three variables. The syntax for the J set of instructions − The following conditional jump instructions have special uses and check the value of flags − Instruction There are numerous conditional jump instructions depending upon the condition and data.įollowing are the conditional jump instructions used on signed data used for arithmetic operations − Instructionįollowing are the conditional jump instructions used on unsigned data used for logical operations − Instruction If some specified condition is satisfied in conditional jump, the control flow is transferred to a target instruction. SHL CX, 1 shift left CX, this in turn doubles the CX value
Jmp tutorial code#
The following code snippet illustrates the JMP instruction − It is an archetypal MACRO assembler for the x86 PC market that is owned and Assembly: Conditional jmp Statements (MASM/TASM) This tutorial explains how to.
The JMP instruction provides a label name where the flow of control is transferred immediately. Transfer of control may be forward, to execute a new set of instructions or backward, to re-execute the same steps. Conditional execution often involves a transfer of control to the address of an instruction that does not follow the currently executing instruction. JLE LP1 If it is less than or equal to 10, then jump to LP1Īs mentioned earlier, this is performed by the JMP instruction. Consider the following typical condition −ĬMPĞDX, 10 Compares whether the counter has reached 10 ExampleĬMP DX,Đ0 Compare the DX value with zeroĬMP is often used for comparing whether a counter value has reached the number of times a loop needs to be run. The source operand could be a constant (immediate) data, register or memory. The destination operand could be either in register or in memory.
SyntaxĬMP compares two numeric data fields. It is used along with the conditional jump instruction for decision making. It does not disturb the destination or source operands. This instruction basically subtracts one operand from the other for comparing whether the operands are equal or not. It is generally used in conditional execution. The CMP instruction compares two operands. Let us discuss the CMP instruction before discussing the conditional instructions. The conditional instructions transfer the control by breaking the sequential flow and they do it by changing the offset value in IP. This is performed by a set of jump instructions j depending upon the condition. This is performed by the JMP instruction.
Conditional execution is observed in two scenarios − Sr.No. These instructions can change the flow of control in a program. Conditional execution in assembly language is accomplished by several looping and branching instructions.
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