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srw
Shift Right Word
PPC440x5 CPU Core User’s Manual Preliminary
Page 408 of 589
instrset.fm.
September 12, 2002
srw
Shift Right Word
n ← (RB)
26:31
r ← ROTL((RS), 32 – n)
if n < 32 then
m
← MASK(n, 31)
else
m
←
32
0
(RA)
← r ∧ m
The contents of register RS are shifted right by the number of bits specified the contents of register RB
26:31
.
Bits shifted right out of the least significant bit are lost, and 0-bits fill the vacated bit positions on the left. The
result is placed into register RA.
Note that if RB
26
= 1, then the shift amount is 32 bits or more, and thus all bits are shifted out such that
register RA is set to zero.
Registers Altered
•RA
• CR[CR0] if Rc contains 1
srw RA, RS, RB Rc=0
srw. RA, RS, RB Rc=1
31 RS RA RB 536 Rc
0 6 11 16 21 31