Condition Codes
When performing operations, the CPU will set condition codes in the status register after
the instruction is executed.
For example the tst, cmp instructions will set the condition codes that represent the result of the comparison of the operands.
The following are all the condition codes available:
For example the tst, cmp instructions will set the condition codes that represent the result of the comparison of the operands.
The following are all the condition codes available:
hi
Unsigned higher
ls
Unsigned lower or same
cc
Carry clear
cs
Carry set
ne
Not equal
eq
Equal
vc
Overflow clear
vs
Overflow set
pl
Plus
mi
Minus
ge
Greater or equal
lt
Less than
gt
Greater than
le
Less than or equal
hs
Unsigned higher or same
lo
Unsigned lower
Condition codes flags
The condition codes X, N, Z, V, C are the individual flags that can be set in the status
register.
X is the extend flag, it is set when the result of an operation is too large to fit in the destination register.
N is the negative flag, it is set when the result of an operation is negative.
Z is the zero flag, it is set when the result of an operation is zero.
V is the overflow flag, in arithmetical operations, it is set if it caused the result to overflow.
C is the carry flag, when an operation causes a carry, like an addition or a shift, it is set to the value of the carry.
X is the extend flag, it is set when the result of an operation is too large to fit in the destination register.
N is the negative flag, it is set when the result of an operation is negative.
Z is the zero flag, it is set when the result of an operation is zero.
V is the overflow flag, in arithmetical operations, it is set if it caused the result to overflow.
C is the carry flag, when an operation causes a carry, like an addition or a shift, it is set to the value of the carry.
hi
!c && !z
ls
c || z
cc
!c
cs
c
ne
!z
eq
z
vc
!v
vs
v
pl
!n
mi
n
ge
(n && v) || (!n && !v)
lt
(n && !v) || (!n && v)
gt
(n && v && !z) || (!n && !v && !z)
le
z || (n && !v) || (!n && v)
hs
!c
lo
c