Computer Hardware User's Guide

Condition Codes and Flags
13-31 Assembly Language Instructions
Table 13–12. Condition Codes and Flags (Continued)
(d) Compare to zero
Condition Code Description Flag
†
Z
NZ
P
N
NN
00101
00110
01001
00111
01010
Zero
Not zero
Positive
Negative
Non-negative
Z
∼Z
∼N AND ∼Z
N
∼N
(e) Compare to condition flags
Condition Code Description Flag
†
NN
N
NZ
Z
NV
V
NUF
UF
NC
C
NLV
LV
NLUF
LUF
ZUF
01010
00111
00110
00101
01100
01101
01110
01111
00100
00001
10000
10001
10010
10011
10100
Non-negative
Negative
Nonzero
Zero
No overflow
Overflow
No underflow
Underflow
No carry
Carry
No latched overflow
Latched overflow
No latched floating-point underflow
Latched floating-point underflow
Zero or floating-point underflow
∼N
N
∼Z
Z
∼
V
V
∼
UF
UF
∼
C
C
∼
LV
LV
∼LUF
LUF
Z OR UF
†
∼ = logical complement (not true condition)