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9-146 PPC405 Core User’s Manual
rlwimi
Rotate Left Word Immediate then Mask Insert
rlwimi
Rotate Left Word Immediate then Mask Insert
r ← ROTL((RS), SH)
m
← MASK(MB, ME)
(RA)
← (r ∧ m) ∨ ((RA) ∧¬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 inserted
into register RA, in positions corresponding to the bit positions in the mask that contain a 1-bit.
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.
rlwimi RA, RS, SH, MB, ME Rc=0
rlwimi. RA, RS, SH, MB, ME Rc=1
20 RS RA SH MB ME Rc
0 6 11 16 21 26 31
Table 9-27. Extended Mnemonics for rlwimi, rlwimi.
Mnemonic Operands Function
Other Registers
Altered
inslwi RA, RS, n, b Insert from left immediate (n > 0).
(RA)
b:b+n-1
← (RS)
0:n-1
Extended mnemonic for
rlwimi RA,RS,32−b,b,b+n−1
inslwi.
Extended mnemonic for
rlwimi. RA,RS,32−b,b,b+n−1
CR[CR0]
insrwi RA, RS, n, b Insert from right immediate. (n > 0)
(RA)
b:b+n-1
← (RS)
32-n:31
Extended mnemonic for
rlwimi RA,RS,32−b−n,b,b+n−1
insrwi.
Extended mnemonic for
rlwimi. RA,RS,32−b−n,b,b+n−1
CR[CR0]