Power ISA™ Version 2.03 - Power.org

Version 2.03
Subtract From Immediate Carrying
D-form
subfic
RT,RA,SI
8 RT RA SI
0 6 11 16 31
RT ¬(RA) + EXTS(SI) + 1
The sum ¬(RA) + SI + 1 is placed into register RT.
Special Registers Altered:
CA
Add Carrying XO-form
addc RT,RA,RB (OE=0 Rc=0)
addc. RT,RA,RB (OE=0 Rc=1)
addco RT,RA,RB (OE=1 Rc=0)
addco. RT,RA,RB (OE=1 Rc=1)
31 RT RA RB OE 10 Rc
0 6 11 16 21 22 31
RT (RA) + (RB)
The sum (RA) + (RB) is placed into register RT.
Special Registers Altered:
CA
CR0
(if Rc=1)
SO OV
(if OE=1)
Subtract From Carrying XO-form
subfc RT,RA,RB (OE=0 Rc=0)
subfc. RT,RA,RB (OE=0 Rc=1)
subfco RT,RA,RB (OE=1 Rc=0)
subfco. RT,RA,RB (OE=1 Rc=1)
31 RT RA RB OE 8 Rc
0 6 11 16 21 22 31
RT ¬(RA) + (RB) + 1
The sum ¬(RA) + (RB) + 1 is placed into register RT.
Special Registers Altered:
CA
CR0
(if Rc=1)
SO OV
(if OE=1)
Extended Mnemonics:
Example of extended mnemonics for Subtract From
Carrying:
Extended:
Equivalent to:
subc Rx,Ry,Rz subfc Rx,Rz,Ry
Chapter 3. Fixed-Point Processor
57