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2006-09-25 09:21

Cruzer

Registered: Dec 2001
Posts: 1048

Unstable Illegal Opcodes

I have always avoided the opcodes that are marked as unstable on Graham's opcode list:

http://www.oxyron.de/html/opcodes02.html

But maybe some of them could be used in some cases after all? Anyone who can shed some light on when excactly they are unstable?

According to Graham's list there are two kinds of unstableness, the first being "unstable in certain matters", which applies to these opcodes:

ahx
shy
shx
tas

The other one doesn't leave much hope: "Highly unstable (results are not predictable on some machines)", but only these two are that bad:

xaa
lax #imm

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2012-02-20 15:35

Frantic

Registered: Mar 2003
Posts: 1633

Edit: nothing...

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