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Instruction Set 9-147
rlwinm
Rotate Left Word Immediate then AND with Mask
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]
LT, GT, EQ, SO
if Rc contains 1
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
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 9-28. 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]