Subfze - IBM PPC440X5 CPU Core User Manual

subfze

Subtract from Zero Extended
PPC440x5 CPU Core User's Manual
subfze
Subtract from Zero Extended
subfze RT, RA
subfze. RT, RA
subfzeo RT, RA
subfzeo. RT, RA
31
0 6
(RT) (RA) + XER[CA]
u
if (RA) + XER[CA]
>
XER[CA] 1
else
XER[CA] 0
The sum of the ones complement of register RA and XER[CA] is stored into register RT.
XER[CA] is set to a value determined by the unsigned magnitude of the result of the subtract operation.
Registers Altered
• RT
• XER[CA]
• CR[CR0] if Rc contains 1
• XER[SO, OV] if OE contains 1
Invalid Instruction Forms
• Reserved fields
Page 434 of 589
OE=0, Rc=0
OE=0, Rc=1
OE=1, Rc=0
OE=1, Rc=1
RT RA
11
32
2 – 1 then
OE
16 21 22
Preliminary
200 Rc
31
instrset.fm.
September 12, 2002