Subfme - IBM PPC440X5 CPU Core User Manual

Preliminary

subfme

Subtract from Minus One Extended
subfme RT, RA
subfme. RT, RA
subfmeo RT, RA
subfmeo. RT, RA
31
0 6
(RT) (RA) – 1 + XER[CA]
if (RA) + 0xFFFF FFFF + XER[CA]
XER[CA] 1
else
XER[CA] 0
The sum of the ones complement of register RA, –1, and XER[CA] is placed 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
• CR[CR0] if Rc contains 1
• XER[SO, OV] if OE contains 1
• XER[CA]
Invalid Instruction Forms
• Reserved fields
instrset.fm.
September 12, 2002
OE=0, Rc=0
OE=0, Rc=1
OE=1, Rc=0
OE=1, Rc=1
RT RA
11
32
u
2 – 1 then
>
Subtract from Minus One Extended
PPC440x5 CPU Core User's Manual
OE
16 21 22
subfme
232 Rc
31
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