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9-150 PPC405 Core User’s Manual
rlwnm
Rotate Left Word then AND with Mask
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]
LT, GT, EQ, SO
if Rc contains 1
Architecture Note
This instruction is part of the PowerPC User Instruction Set Architecture.
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 9-29. 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]