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SWAP (Super FX): Difference between revisions
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!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
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|'''Addressing Mode''' | |||
|'''Opcode''' | |'''Opcode''' | ||
|'''Length''' | |'''Length''' | ||
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|'''Cache Speed''' | |'''Cache Speed''' | ||
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|[[Implied]] (type 1) | |||
|4D | |4D | ||
|1 byte | |1 byte | ||
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|[[Sign Flag|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. | '''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 === | === See Also === | ||
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* [[XCE]] | * [[XCE]] | ||
* [[XCN]] | * [[XCN]] | ||
* [[MERGE]] | |||
=== External Links === | === External Links === | ||
* Official Nintendo documentation on SWAP: [https://archive.org/details/SNESDevManual/book2/page/n276 | * 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]] | ||
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[[Category:Byte Transfer Instructions]] | [[Category:Byte Transfer Instructions]] | ||
[[Category:One-byte 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
See Also
External Links
- Official Nintendo documentation on SWAP: 9.88 on page 2-9-120 of Book II