Cntlzw - IBM PPC440X5 CPU Core User Manual

cntlzw

Count Leading Zeros Word
PPC440x5 CPU Core User's Manual
cntlzw
Count Leading Zeros Word
cntlzw RA, RS
cntlzw. RA, RS
31
0 6
n 0
do while n < 32
if (RS) = 1 then leave
n
n n + 1
(RA) n
The consecutive leading 0 bits in register RS are counted; the count is placed into register RA.
The count ranges from 0 through 32, inclusive.
Registers Altered
• RA
• CR[CR0] if Rc contains 1
Invalid Instruction Forms
• Reserved fields
Page 286 of 589
RS RA
11
Rc=0
Rc=1
16 21
Preliminary
26 Rc
31
instrset.fm.
September 12, 2002