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MERGE (Super FX): Difference between revisions
From SnesLab
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'''MERGE''' is a [[Super FX]] instruction that merges the high byte of two registers into the [[destination register]]. | '''MERGE''' is a [[Super FX]] instruction that merges the high byte of two registers into the [[destination register]]. | ||
The high byte of | The high byte of D<sub>reg</sub> comes from R<sub>7</sub>. | ||
The low byte of | The low byte of D<sub>reg</sub> comes from R<sub>8</sub>. | ||
The official documentation has several bits labeled "B" not 'D" below the "Flags affected" table.<sup>[1]</sup> | The official documentation has several bits labeled "B" not 'D" below the "Flags affected" table.<sup>[1]</sup> | ||
Revision as of 08:53, 16 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Implied (type 1) | 70 | 1 byte | 3 cycles | 3 cycles | 1 cycle | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| 0 | 0 | 0 | ||||||
MERGE is a Super FX instruction that merges the high byte of two registers into the destination register.
The high byte of Dreg comes from R7. The low byte of Dreg comes from R8.
The official documentation has several bits labeled "B" not 'D" below the "Flags affected" table.[1]
The ALT0 state is restored.
The destination register should be specified in advance using WITH or TO. Otherwise, R0 serves as the default.
Syntax
MERGE
Example
Let:
Dreg : R9 R7 = 05aah R8 = fc33h
After executing MERGE:
R9 = 05fch
and the sign, overflow, carry, and zero flags are set
See Also
External Links
- Official Nintendo documentation on MERGE: paragraph 9.56 on page 2-9-79 of Book II
- example: page 2-9-80 of Book II, lbid.