On Tue, 15 Sep 2009, Gabriel Michael Black wrote:
> Never mind. I realized what was going on as I was getting ready for
> work this morning. imm is the same size for all microops, but when
> it's stored internal to the microop it gets truncated into a 16 bit
> immediate value. A better solution might be to make the wripi
> instruction sign extend its immediate since a signed displacement
> sounds like it would be a lot more common. If you'd like to give that
> a try, the code you want is in regop.isa. I'll try that this evening
> if I have time. If that works for you please let me know.
Is there some documentation that describes the process for uop generation?
I can't find anything useful on the wiki, and I can't seem to track
backwards to find exactly where the immediate value for wripi is being
generated.
The regop.isa file you mention only has this:
class Wrip(WrRegOp, CondRegOp):
code = 'RIP = psrc1 + sop2 + CSBase'
else_code="RIP = RIP;"
Which I must admit isn't that helpful. Part of the problem is I don't
know python very well, and C++ isn't a strong point either.
Vince
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