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[Frug]: R5900 viaddi instruction is improperly decoded #75

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Mc-muffin opened this issue Feb 5, 2025 · 0 comments
Open

[Frug]: R5900 viaddi instruction is improperly decoded #75

Mc-muffin opened this issue Feb 5, 2025 · 0 comments
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frug Shomething isn't working

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@Mc-muffin
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Explain the problem.

There's a decoding bug in the VU instruction viaddi, the imm5 is signed but it's decoded as unsigned.

Reproducer

Decode B207034A, it should decode as viaddi $vi3, $vi0, -0x2 but it's decoding as viaddi $vi3, $vi0, 0x1E instead.

Is this issue related to an specific MIPS extension?

R5900 EE (Emotion Engine, A Sony PlayStation 2 extension)

rabbitizer version

1.12.5

Optional: splat/spimdisasm version

No response

Optional: Version of other stuff

No response

Extra comments?

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@Mc-muffin Mc-muffin added the frug Shomething isn't working label Feb 5, 2025
@AngheloAlf AngheloAlf mentioned this issue Feb 6, 2025
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