Intel 386 User Manual page 642

Table E-1. Instruction Set Summary (Sheet 4 of 19)
Instruction
SUB = Subtract
register from register 0 0 1 0 1 0 d w
register from memory 0 0 1 0 1 0 0 w
memory from register 0 0 1 0 1 0 1 w
immediate from
1 0 0 0 0 0 s w
register/memory
immediate from accu-
0 0 1 0 1 1 0 w
mulator (short form)
SBB = Subtract with borrow
register from register 0 0 0 1 1 0 d w
register from memory 0 0 0 1 1 0 0 w
memory from register 0 0 0 1 1 0 1 w
immediate from
1 0 0 0 0 0 s w
register/memory
immediate from accu-
0 0 0 1 1 1 0 w
mulator (short form)
DEC = Decrement
register/memory 1 1 1 1 1 1 1 w
register (short form) 0 1 0 0 1 reg
CMP = Compare
register with register 0 0 1 1 1 0 d w
memory with register 0 0 1 1 1 0 0 w
register with memory 0 0 1 1 1 0 1 w
immediate with
1 0 0 0 0 0 s w
register/memory
immediate with accu-
0 0 1 1 1 1 0 w
mulator (short form)
NEG = Change sign 1 1 1 1 0 1 1 w
AAA = ASCII adjust for
0 0 1 1 0 1 1 1
addition
AAS = ASCII adjust for
0 0 1 1 1 1 1 1
subtraction
DAA = Decimal adjust
0 0 1 0 0 1 1 1
for addition
DAS = Decimal adjust for
0 0 1 0 1 1 1 1
subtraction
Format
mod reg r/m
mod reg r/m
mod reg r/m
mod 101 r/m immediate data
immediate data
mod reg r/m
mod reg r/m
mod reg r/m
mod 0 1 1 r/m immediate data
immediate data
reg 0 0 1 r/m
mod reg r/m
mod reg r/m
mod reg r/m
immediate
mod 1 1 1 r/m
data
immediate
data
mod 0 1 1 r/m
INSTRUCTION SET SUMMARY
Clock Count Notes
Real Pro- Real
Ad- tected Ad-
dress Virtual dress
Mode Ad- Mode
or dress or
Virtual Mode Virtual
8086 8086
Mode Mode
2 2
7** 7** b
6* 6* b
2/7** 2/7** b
2 2
2 2
7** 7** b
6* 6* b
2/7** 2/7** b
2 2
2/6 2/6 b
2 2
2 2
5* 5* b
6* 6* b
2/5* 2/5* b
2 2
2/6* 2/6* b
4 4
4 4
4 4
4 4
Pro-
tected
Virtual
Ad-
dress
Mode
h
h
h
h
h
h
h
h
h
h
h
E-5