A SERVICE OF

logo

9-38 PPC405 Core User’s Manual
cntlzw
Count Leading Zeros Word
cntlzw
Count Leading Zeros Word
n 0
do while n < 32
if (RS)
n
= 1 then leave
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]
LT, GT, EQ, SO
if Rc contains 1
Invalid Instruction Forms
Reserved fields
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
cntlzw RA, RS Rc=0
cntlzw. RA, RS Rc=1
31 RS RA 26 Rc
0 6 11 16 21 31