On Sun, 26 Jun 2011, Gabe Black wrote:
Yes, that's correct. If it doesn't start with a 0x0F, there isn't any
way to tell if it's the start of a two byte opcode or just a one byte
opcode by itself. You might want to reconsider using an immediate, but
I wouldn't be -that- surprised if there was somewhere you could fit a
single opcode and get away with having an immediate. If I get a chance
I'll look for a spot, although I can't promise anything.
Gabe
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0x0F 0x04 looks like it's available. It's marked as invalid which I
assume means it's reserved in case they want to wedge more instructions
in there, but it should be fine for you to use. My pdfs are a few years
old so there may be some fancy new instruction that goes there, but you
should be safe ignoring that.
That's what we currently use for pseudo instructions.
--
Nilay
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