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BPL (Super FX): Difference between revisions
From SnesLab
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{| class="wikitable" style="float:right;clear:right;width: | {| class="wikitable" style="float:right;clear:right;width:50%" | ||
!colspan="8"|Basic Info | !colspan="8"|Basic Info | ||
|+ | |+ | ||
|'''Addressing Mode''' | |||
|'''Opcode''' | |'''Opcode''' | ||
|'''Length''' | |'''Length''' | ||
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|'''Cache Speed''' | |'''Cache Speed''' | ||
|+ | |+ | ||
|[[Program Counter Relative]] | |||
|0A?? | |0A?? | ||
|2 bytes | |2 bytes | ||
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!colspan="9"|Flags Affected | !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]] | ||
|+ | |+ | ||
|. | |. | ||
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|} | |} | ||
'''BPL''' (Branch | '''BPL''' (Branch Plus) is a [[Super FX]] instruction that performs a conditional jump if the [[sign flag]] is clear. If the sign flag is set, nothing happens. Note that zero is considered positive. | ||
The instruction after BPL is already in the pipeline and will run even if the branch occurs. | |||
No flags are affected. | No flags are affected. | ||
==== Syntax ==== | |||
<pre> | |||
BPL e | |||
</pre> | |||
==== Example ==== | |||
Let the sign flag be clear. This instruction jumps the program forward 4 bytes: | |||
<pre> | |||
BPL $+4h | |||
</pre> | |||
=== See Also === | === See Also === | ||
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=== External Links === | === External Links === | ||
* Official Nintendo documentation on BPL: [https://archive.org/details/SNESDevManual/book2/page/n186 | * Official Nintendo documentation on BPL: paragraph 9.23 on [https://archive.org/details/SNESDevManual/book2/page/n186 page 2-9-30 of Book II] | ||
* example: [https://archive.org/details/SNESDevManual/book2/page/n187 page 2-9-31], lbid. | * example: [https://archive.org/details/SNESDevManual/book2/page/n187 page 2-9-31], lbid. | ||
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[[Category:ASM]] | [[Category:ASM]] | ||
[[Category:Two-byte Instructions]] | [[Category:Two-byte Instructions]] | ||
[[Category:Instructions with Delay Slots]] | |||
Latest revision as of 08:17, 14 July 2024
| Basic Info | |||||||
|---|---|---|---|---|---|---|---|
| Addressing Mode | Opcode | Length | ROM Speed | RAM Speed | Cache Speed | ||
| Program Counter Relative | 0A?? | 2 bytes | 6 cycles | 6 cycles | 2 cycles | ||
| Flags Affected | ||||||||
|---|---|---|---|---|---|---|---|---|
| B | ALT1 | ALT2 | O/V | S | CY | Z | ||
| . | . | . | . | . | . | . | ||
BPL (Branch Plus) is a Super FX instruction that performs a conditional jump if the sign flag is clear. If the sign flag is set, nothing happens. Note that zero is considered positive.
The instruction after BPL is already in the pipeline and will run even if the branch occurs.
No flags are affected.
Syntax
BPL e
Example
Let the sign flag be clear. This instruction jumps the program forward 4 bytes:
BPL $+4h
See Also
External Links
- Official Nintendo documentation on BPL: paragraph 9.23 on page 2-9-30 of Book II
- example: page 2-9-31, lbid.