#haskell - Mon 19 Feb 2007 between 22:50 and 22:55

NY Lost Funds



ddariusIncidentally, noone happens to know how to typeset a character over an operator in LaTeX off hand?
LoganCapaldo_All registers are general purpose with enough creativity ;)
SamBhow are "JMP r/m16" and "JMP r/m32" distinguished...
kc5tjaSamB: $66 or $67 prefix opcode byte, I forget which.
ddariusSamB: The assembler knows...
kc5tja$66 is the operand size override byte, and $67 is addressing mode operand override byte.
But they're not used consistently for those purposes.
SamBddarius: they both have $FF for an opcode
kc5tja$FF is another prefix byte.
You do realize that some x86 instructions can be up to 15 (!!) bytes long, yes?
ddariusSamB: Okay, I thought you meant at the assembler level, but at the opcode level, it is as kc5tja says.
SamBwow
jcreighkc5tja: what? seriously?
whoa
kc5tjaYup.
LoganCapaldo_15 double facorial byte long instructions?
SamByou didn't know that x86 was VLIW-capable?
LoganCapaldo_Amazing
kc5tjaUsing every override prefix, one segment override prefix, SIB-based addressing modes with 32-bit offsets, you can really rack'em up. :)
LoganCapaldo_I didn't think you could address that much memory :)
SamBLoganCapaldo: arggg
kc5tjaFortunately, not many instructions require so many bytes. :)
sorearno, instructions cannot be longer than 15 bytes iirc
kc5tjaGotta love CISC.
sorear: Wrong.
sorearthere are longer instructions, but they are illegal
kc5tjasorear: Modern CPUs have prefetch buffers that are 18 bytes long.
ddariusBah, \mathcal is ugly except that it works very well for the Fourier transform.
mbishopsorear: I am using your code from earlier, to get epoch seconds, but it outputs IO Integer, which doesn't lend itself well to doing math on it...
kc5tjaBut that's only because the longest possible instruction *is* 15 bytes, so they leave 3 bytes left over for "the next instruction."
actionkc5tja detests the x86 architecture.
kc5tjadetests the x86 architecture.
16-, 32-, or 64-bit, doesn't matter.
The market should have gone PowerPC.
SamBwhat about 8-bit?
kc5tja*sighs*
actionsorear detests all von neumann architecturs
soreardetests all von neumann architecturs
actionzbrown likes sparc :)
zbrownlikes sparc :)
kc5tjaSamB: True, the 6502 thoroughly kicks its ass there too.
SamBum, pardon me, but PPC doesn't have 16-bit
kc5tjaSamB: So?

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