Intel 64 and IA-32 Architectures Software Developers Manual Volume 1, Basic Architecture

B-2 Vol. 1

EFLAGS CONDITION CODES

Many of the test conditions are described in two different ways. For example, LE (less

or equal) and NG (not greater) describe the same test condition. Alternate

mnemonics are provided to make code more intelligible.

The terms “above” and “below” are associated with the CF flag and refer to the rela-

tion between two unsigned integer values. The terms “greater” and “less” are asso-

ciated with the SF and OF flags and refer to the relation between two signed integer

values.

No parity

Parity odd

1011 PF = 0

NGE

Less

Neither greater nor equal

1100 (SF xOR OF) = 1

Not less

Greater or equal

1101 (SF xOR OF) = 0

Less or equal

Not greater

1110 ((SF XOR OF) OR ZF) = 1

NLE

Neither less nor equal

Greater

1111 ((SF XOR OF) OR ZF) = 0

Table B-1. EFLAGS Condition Codes (Contd.)

Mnemonic (cc) Condition Tested For

Instruction

Subcode Status Flags Setting