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7 DETAILS OF INSTRUCTIONS
swap %rd, %rs
Function
Swap
Standard)
Extension 1) Unusable
Extension 2) Unusable
15 14 13 12 11 10
Code
0
0
1
|
|
IL
IE
C
Flag
|
|
–
–
–
Mode
Src: Register direct %rs = %r0 to %r7
Dst: Register direct %rd = %r0 to %r7
CLK
One cycle
Description
(1) Standard
Swaps the byte order of the 16 low-order bits of the rs register high and low and loads the
results to the rd register.
23
X
rs
23
0
rd
(2) Delayed slot instruction
This instruction may be executed as a delayed slot instruction by writing it directly after a
branch instruction with the "d" bit.
Example
When r1 = 0x123456
swap
%r2,%r1
7-132
rd(15:8) ← rs(7:0), rd(7:0) ← rs(15:8), rd(23:16) ← 0
9
8
7
|
|
0
1
1
r d
|
|
|
|
|
V
Z
N
|
|
|
–
–
–
16
15
X
X
X
X
X
X X
16
0
0
0
0
0
0 0
15
; 0x005634 → r2
Seiko Epson Corporation
6
5
4
3
2
1
0
|
1
1
1
1
r s
|
|
|
|
|
8 7
Byte 1
Byte 0
Byte 0
Byte 1
8 7
0
0
S1C17 CORE MANUAL
(REV. 1.2)
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