IBM PPC440X5 - page 434

subfze
Subtract from Zero Extended
PPC440x5 CPU Core User’s Manual Preliminary
Page 434 of 589 instrset.fm.
September 12, 2002
subfze
Subtract from Zero Extended
(RT) ←¬(RA) + XER[CA]
if ¬(RA) + XER[CA] 232 – 1 then
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
subfze RT, RA OE=0, Rc =0
subfze. RT, RA OE=0, Rc =1
subfzeo RT, RA OE=1, Rc =0
subfzeo. RT, RA OE=1, Rc =1
31 RT RA OE 200 Rc
0 6 11 16 21 22 31
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