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'''SWAP''' is a [[Super FX]] instruction that swaps two bytes.
{| class="wikitable" style="float:right;clear:right;width:50%"
!colspan="8"|Basic Info
|+
|'''Addressing Mode'''
|'''Opcode'''
|'''Length'''
|'''ROM Speed'''
|'''RAM Speed'''
|'''Cache Speed'''
|+
|[[Implied]] (type 1)
|4D
|1 byte
|3 cycles
|3 cycles
|1 cycle
|}


{| class="wikitable" style="float:right;clear:right;width:30%"
{| class="wikitable" style="float:right;clear:right;width:30%"
!colspan="9"|Flags Clobbered
!colspan="9"|Flags Affected
|+
|+
|B
|[[B Flag|B]]
|ALT1
|[[ALT1]]
|ALT2
|[[ALT2]]
|O/V
|[[O/V]]
|S
|[[Sign Flag|S]]
|CY
|[[CY]]
|Z
|[[Zero Flag|Z]]
|+
|+
|0
|0
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|0
|0
|.
|.
|
|S
|.
|.
|
|Z
|}
|}
'''SWAP''' is a [[Super FX]] instruction that swaps two bytes.  The low byte of the [[source register]] is written to the high byte of the [[destination register]], and the high byte of the source register is written to the low byte of the destination register.  The source register itself is left unchanged.
The [[ALT0]] state is restored.
The source and destination registers should be specified in advance using [[WITH]], [[FROM]], or [[TO]].  Otherwise, R<sub>0</sub> serves as the default.
==== Syntax ====
<pre>
SWAP
</pre>
==== Example ====
Let:
S<sub>reg</sub> : R<sub>3</sub>
D<sub>reg</sub> : R<sub>13</sub>
R<sub>3</sub> : 48d0h
After executing SWAP:
R<sub>13</sub> = d048h
[[File:gsu_swap.png]]
=== See Also ===
* [[XBA]]
* [[XCE]]
* [[XCN]]
* [[MERGE]]
=== External Links ===
* Official Nintendo documentation on SWAP: 9.88 on [https://archive.org/details/SNESDevManual/book2/page/n276 page 2-9-120 of Book II]


[[Category:ASM]]
[[Category:ASM]]
[[Category:Enhancement Chips]]
[[Category:Super FX]]
[[Category:Byte Transfer Instructions]]
[[Category:One-byte Instructions]]
[[Category:Expects Sreg/Dreg Prearranged]]
[[Category:Exchange Instructions]]

Latest revision as of 19:15, 30 July 2024

Basic Info
Addressing Mode Opcode Length ROM Speed RAM Speed Cache Speed
Implied (type 1) 4D 1 byte 3 cycles 3 cycles 1 cycle
Flags Affected
B ALT1 ALT2 O/V S CY Z
0 0 0 . S . Z

SWAP is a Super FX instruction that swaps two bytes. The low byte of the source register is written to the high byte of the destination register, and the high byte of the source register is written to the low byte of the destination register. The source register itself is left unchanged.

The ALT0 state is restored.

The source and destination registers should be specified in advance using WITH, FROM, or TO. Otherwise, R0 serves as the default.

Syntax

SWAP

Example

Let:

Sreg : R3
Dreg : R13
R3 : 48d0h

After executing SWAP:

R13 = d048h

gsu swap.png

See Also

External Links