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XOR (Super FX): Difference between revisions
From SnesLab
(low nybble of opcode speculation) |
(spelling) |
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It probably restores the [[ALT0]] state like [[OR]]. | It probably restores the [[ALT0]] state like [[OR]]. | ||
The low nybble of the opcode probably | The low nybble of the opcode probably specifies either the immediate value or which general register to use, like OR. | ||
The source and destination registers should be specified in advance using [[WITH]], [[FROM]], or [[TO]]. Otherwise, R<sub>0</sub> serves as the default. | The source and destination registers should be specified in advance using [[WITH]], [[FROM]], or [[TO]]. Otherwise, R<sub>0</sub> serves as the default. | ||
Revision as of 03:58, 22 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | Speed | ||||
| Immediate | 3FC | 2 bytes | |||||
| Implied (type 1) | 3DC | 2 bytes | |||||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0? | 0? | 0? | .? | ? | .? | ? | ||
XOR is an undocumented[dubious] (XOR is mentioned on page 2-2-7 of Book II of the Nintendo documentation) Super FX instruction that performs an exculsive or.
It probably restores the ALT0 state like OR.
The low nybble of the opcode probably specifies either the immediate value or which general register to use, like OR.
The source and destination registers should be specified in advance using WITH, FROM, or TO. Otherwise, R0 serves as the default.
Syntax
XOR Rn XOR #n
See Also
References
- https://en.wikibooks.org/wiki/Super_NES_Programming/Super_FX_tutorial#Instruction_Set_Table
- Example 3 on page 2-8-10 of Book II of the official Super Nintendo development manual