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ALT2: Difference between revisions
From SnesLab
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* [[SUB]] #n | * [[SUB]] #n | ||
Many instructions clear the ALT2 flag | Many instructions clear the ALT2 flag, including: | ||
* [[GSU/ADC|ADC]] R<sub>n</sub> | |||
* [[GSU/ADC|ADC]] #n | |||
* [[ADD]] R<sub>n</sub> | |||
* [[ADD]] #n | |||
* [[GSU/AND|AND]] R<sub>n</sub> | |||
* [[GSU/AND|AND]] #n | |||
* [[ASR]] | |||
* [[BIC]] R<sub>n</sub> | |||
* [[BIC]] #n | |||
* [[CACHE]] | |||
* [[CMODE]] | |||
* [[GSU/CMP|CMP]] R<sub>n</sub> | |||
* [[COLOR]] | |||
* [[GSU/DEC|DEC]] R<sub>n</sub> | |||
* [[DIV2]] | |||
* [[FMULT]] | |||
* [[GETB]] | |||
* [[GETBH]] | |||
* [[GETBL]] | |||
* [[GETBS]] | |||
* [[GETC]] | |||
* [[HIB]] | |||
* [[IBT]] R<sub>n</sub>, #pp | |||
* [[GSU/INC|INC]] R<sub>n</sub> | |||
* [[IWT]] R<sub>n</sub>, #xx | |||
* [[GSU/JMP|JMP]] R<sub>n</sub> | |||
* [[LDB]] (R<sub>m</sub>) | |||
* [[LDW]] (R<sub>m</sub>) | |||
* [[LEA]] R<sub>n</sub>, xx | |||
* [[LINK]] #n | |||
* [[LJMP]] R<sub>n</sub> | |||
* [[GSU/LM|LM]] R<sub>n</sub>, (xx) | |||
* [[LMS]] R<sub>n</sub>, (yy) | |||
* [[LMULT]] | |||
* [[LOB]] | |||
* [[LOOP]] | |||
* [[GSU/LSR|LSR]] | |||
* [[MERGE]] | |||
* [[GSU/MOVE|MOVE]] R<sub>n</sub>, R<sub>n</sub>' | |||
* [[MOVES]] R<sub>n</sub>, R<sub>n</sub>' | |||
* [[MULT]] R<sub>n</sub> | |||
* [[MULT]] #n | |||
* [[GSU/NOP|NOP]] | |||
* [[NOT]] | |||
* [[OR]] R<sub>n</sub> | |||
* [[OR]] #n | |||
* [[PLOT]] | |||
* [[RAMB]] | |||
* [[GSU/ROL|ROL]] | |||
* [[ROMB]] | |||
* [[GSU/ROR|ROR]] | |||
* [[RPIX]] | |||
* [[GSU/SBC|SBC]] R<sub>n</sub> | |||
* [[SBK]] | |||
* [[SEX]] | |||
* [[SM]] (xx), R<sub>n</sub> | |||
* [[SMS]] (yy), R<sub>n</sub> | |||
* [[STB]] (R<sub>m</sub>) | |||
* [[STOP]] | |||
* [[STW]] (R<sub>m</sub>) | |||
* [[SUB]] R<sub>n</sub> | |||
* [[SUB]] #n | |||
* [[SWAP]] | |||
* [[UMULT]] R<sub>n</sub> | |||
* and presumably UMULT #n too | |||
==== Syntax ==== | ==== Syntax ==== | ||
Revision as of 03:54, 16 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 2) | 3E | 1 byte | 3 cycles | 3 cycles | 1 cycle | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| . | . | 1 | . | . | . | . | ||
ALT2 is both the name of a Super FX flag and the flag prefix instruction that sets it. It is bit 9 of the status flag register.
The following instructions require ALT2:
Many instructions clear the ALT2 flag, including:
- ADC Rn
- ADC #n
- ADD Rn
- ADD #n
- AND Rn
- AND #n
- ASR
- BIC Rn
- BIC #n
- CACHE
- CMODE
- CMP Rn
- COLOR
- DEC Rn
- DIV2
- FMULT
- GETB
- GETBH
- GETBL
- GETBS
- GETC
- HIB
- IBT Rn, #pp
- INC Rn
- IWT Rn, #xx
- JMP Rn
- LDB (Rm)
- LDW (Rm)
- LEA Rn, xx
- LINK #n
- LJMP Rn
- LM Rn, (xx)
- LMS Rn, (yy)
- LMULT
- LOB
- LOOP
- LSR
- MERGE
- MOVE Rn, Rn'
- MOVES Rn, Rn'
- MULT Rn
- MULT #n
- NOP
- NOT
- OR Rn
- OR #n
- PLOT
- RAMB
- ROL
- ROMB
- ROR
- RPIX
- SBC Rn
- SBK
- SEX
- SM (xx), Rn
- SMS (yy), Rn
- STB (Rm)
- STOP
- STW (Rm)
- SUB Rn
- SUB #n
- SWAP
- UMULT Rn
- and presumably UMULT #n too
Syntax
ALT2
See Also
External Links
- Official Nintendo documentation on ALT2: 9.9 on page 2-9-8 of Book II
- Table 2-4-2 on page 2-4-4, lbid.