Instruction-set: jae and jge

edits.asm - tv2.0

2026-01-16

Written by: xiaobin

JAE, Jump if Above or Equal, should be used when comparing unsigned numbers.

JGE, Jump if Greater or Equal, should be used when comparing signed numbers.

JAE

Jump If Above or Equal

JAE short-label
Logic:

    Jump if CF = 0

Used after a CMP or SUB instruction, JAE transfers control to short-label if the first operand (which should be unsigned) was greater than or equal to the second operand (also unsigned). The target of the jump must be within -128 to +127 bytes of the next instruction.

Note: JNB (Jump Not Below) is the same instruction as JAE.

JGE

Jump If Greater or Equal

JGE short-label Logic:

Jump if SF = OF

Used after a CMP or SUB instruction, JGE transfers control to short- label if the first operand is greater than or equal to the second. (Both operands are treated as signed numbers.) The target of the jump must be within -128 to +127 bytes of the next instruction.

Note: JNL, Jump if Not Less, is the same instruction as JGE.

Ref

• “J” Instructions
• Borland Original Turbo Vision 2.0.3 code
• turbo vision