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rlwinm
Rotate Left Word Immediate then AND with Mask
PPC440x5 CPU Core User’s Manual Preliminary
Page 400 of 589
instrset.fm.
September 12, 2002
rlwinm
Rotate Left Word Immediate then AND with Mask
r ← ROTL((RS), SH)
m
← MASK(MB, ME)
(RA)
← r ∧ m
The contents of register RS are rotated left by the number of bit positions specified in the SH field. A mask is
generated, having 1-bits starting at the bit position specified in the MB field and ending in the bit position
specified by the ME field with 0-bits elsewhere.
If the starting point of the mask is at a higher bit position than the ending point, the 1-bits portion of the mask
wraps from the highest bit position back around to the lowest. The rotated data is ANDed with the generated
mask; the result is placed into register RA.
Registers Altered
•RA
• CR[CR0] if Rc contains 1
rlwinm RA, RS, SH, MB, ME Rc=0
rlwinm. RA, RS, SH, MB, ME Rc=1
21 RS RA SH MB ME Rc
0 6 11 16 21 26 31
Table 9-27. Extended Mnemonics for rlwinm, rlwinm.
Mnemonic Operands Function
Other Registers
Altered
clrlwi
RA, RS, n
Clear left immediate. (
n < 32)
(RA)
0:n-1
←
n
0
Extended mnemonic for
rlwinm RA,RS,0,n,31
clrlwi.
Extended mnemonic for
rlwinm. RA,RS,0,n,31
CR[CR0]
clrlslwi
RA, RS, b, n
Clear left and shift left immediate.
(
n ≤ b < 32)
(RA)
b-n:31-n
← (RS)
b:31
(RA)
32-n:31
←
n
0
(RA)
0:b-n-1
←
b-n
0
Extended mnemonic for
rlwinm RA,RS,n,b−n,31−n
clrlslwi.
Extended mnemonic for
rlwinm. RA,RS,n,b−n,31−n
CR[CR0]