Red Hat ENTERPRISE LINUX 4 Manual page 199

Chapter 6. Extensions to the C Language Family
y
register
DPH
z
register
DPL
q
register
SP
c
or registers (offsettable address)
DP SP
d
Non-pointer registers (not
u
Non-SP registers (everything except
R
Indirect through
S
Indirect through
T
Data-section immediate value
I
Integers from -255 to -1
J
Integers from 0 to 7--valid bit number in a register
K
Integers from 0 to 127--valid displacement for addressing mode
L
Integers from 1 to 127
M
Integer -1
N
Integer 1
O
Zero
, , )
SP DP IP
SP
- Avoid this except for
IP
or with short displacement (0..127)
SP DP
)
, since we can't access extra bytes
QImode
191