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B-40 PPC405 Core User’s Manual
B.10 Rotate and Shift Instructions
Rotate and shift instructions rotate and shift operands which are stored in the general purpose
registers. Rotate instructions can also mask rotated operands. Table B-11 shows the PPC405 rotate
and shift instructions.
Table B-11. Rotate and Shift Instructions
Mnemonic Operands Function
Other Registers
Changed Page
rlwimi RA, RS, SH,
MB, ME
Rotate left word immediate, then insert according to
mask.
r
← ROTL((RS), SH)
m
← MASK(MB, ME)
(RA)
← (r ∧ m) ∨ ((RA) ∧¬m)
9-146
rlwimi. CR[CR0]
rlwinm RA, RS, SH,
MB, ME
Rotate left word immediate, then AND with mask.
r
← ROTL((RS), SH)
m
← MASK(MB, ME)
(RA)
← (r ∧ m)
9-147
rlwinm. CR[CR0]
rlwnm RA, RS, RB,
MB, ME
Rotate left word, then AND with mask.
r
← ROTL((RS), (RB)
27:31
)
m
← MASK(MB, ME)
(RA)
← (r ∧ m)
9-150
rlwnm. CR[CR0]
slw RA, RS, RB Shift left (RS) by (RB)
27:31
.
n
← (RB)
27:31.
r ← ROTL((RS), n).
if (RB)
26
= 0 then m ← MASK(0, 31 – n)
else m
←
32
0.
(RA)
← r ∧ m.
9-152
slw. CR[CR0]
sraw RA, RS, RB Shift right algebraic (RS) by (RB)
27:31
.
n
← (RB)
27:31
.
r
← ROTL((RS), 32 –
n
).
if (RB)
26
= 0 then m ← MASK(n, 31)
else m
←
32
0.
s
← (RS)
0.
(RA) ← (r ∧ m) ∨ (
32
s ∧¬m).
XER[CA]
← s ∧ ((r ∧¬m) ≠ 0).
9-153
sraw. CR[CR0]
srawi RA, RS, SH Shift right algebraic (RS) by SH.
n
← SH.
r
← ROTL((RS), 32 – n).
m
← MASK(n, 31).
s
← (RS)
0.
(RA) ← (r ∧ m) ∨ (
32
s ∧¬m).
XER[CA]
← s ∧ ((r ∧¬m)≠0).
9-154
srawi. CR[CR0]
srw RA, RS, RB Shift right (RS) by (RB)
27:31
.
n
← (RB)
27:31
.
r
← ROTL((RS), 32 – n).
if (RB)
26
= 0 then m ← MASK(n, 31)
else m
←
32
0.
(RA)
← r ∧ m.
9-155
srw. CR[CR0]