Subfe - IBM PPC440X5 CPU Core User Manual

Preliminary

subfe

Subtract From Extended
subfe RT, RA, RB
subfe. RT, RA, RB
subfeo RT, RA, RB
subfeo. RT, RA, RB
31
0 6
(RT) (RA) + (RB) + XER[CA]
if (RA) + (RB) + XER[CA]
XER[CA] 1
else
XER[CA] 0
The sum of the ones complement of register RA, register RB, 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
• XER[CA]
• CR[CR0] if Rc contains 1
• XER[SO, OV] if OE contains 1
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
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PPC440x5 CPU Core User's Manual
RB OE
16 21 22
subfe
Subtract From Extended
136 Rc
31
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