Some mnemonic of the "branch structure" JCC

Tag: LSP BSP cell greater than state comparison border order overflow

EAX > EBX

Of=0 sf=0 zf=0 af=0 pf=0 cf=0

EAX = ebx

Of=0 sf=0 zf=1 af=0 pf=1 cf=0

EAX < EBX

Of=0 sf=1 zf=0 af=1 pf=1 cf=1

Among them, focus on CF,ZF, ( SF andof)

The JCC directive has 10 instructions for each of the 10 states of the five status flags, as follows:

Sign	State	Instructions	Description
Zf	Zf=1	JZ	Equal/equal to zero
	Zf=0	Jnz	----
SF	Sf=1	Js	Symbol is negative
	Sf=0	JNS	----
Pf	Pf=1	Jp	The number of "1" is even
	Pf=0	JNP	----
Of	Of=1	JO	There is overflow
	Of=0	Jno	----
Cf	Cf=1	Jc	With carry/Less
	Cf=0	JNC	----

！ There are multiple mnemonics for directives, and only one is listed here to indicate

Instructions	State	Description
JA	Cf=0 & Zf=0	Higher than
JNA	cf=1 | Zf=1	----
JL	SF = of	Less than
JNL	Sf≠of	----
Jg	(SF = of) & (ZF = 0)	Greater than
JNG	(sf≠of) & (ZF = 1)	----

JA is the unsigned integer, JL, JG is a signed integer, the reference state whether the SF can be identified.

It is easy to make judgments, combined with the EAX and EBX comparisons described earlier.

Another: Above can also be described as not less than, less than can also be described as not greater than, because the same instruction will have multiple mnemonics, so specifically how to understand, depending on the situation.

Some mnemonic of the "branch structure" JCC