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rlwnm
Rotate Left Word then AND with Mask
Preliminary PPC440x5 CPU Core User’s Manual
instrset.fm.
September 12, 2002 Page 403 of 589
rlwnm
Rotate Left Word then AND with Mask
r ← ROTL((RS), (RB)
27:31
)
m
← MASK(MB, ME)
(RA)
← r ∧ m
The contents of register RS are rotated left by the number of bit positions specified by the contents of register
RB
27:31
. 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 ones portion of the mask
wraps from the highest bit position back to the lowest. The rotated data is ANDed with the generated mask
and the result is placed into register RA.
Registers Altered
•RA
• CR[CR0] if Rc contains 1
rlwnm RA, RS, RB, MB, ME Rc=0
rlwnm. RA, RS, RB, MB, ME Rc=1
23 RS RA RB MB ME Rc
0 6 11 16 21 26 31
Table 9-28. Extended Mnemonics for rlwnm, rlwnm.
Mnemonic Operands Function
Other Registers
Altered
rotlw
RA, RS, RB
Rotate left.
(RA)
← ROTL((RS), (RB)
27:31
)
Extended mnemonic for
rlwnm RA,RS,RB,0,31
rotlw.
Extended mnemonic for
rlwnm. RA,RS,RB,0,31
CR[CR0]