New stack ops

[Dan Sugalski]

Okay, in an attempt to get back to doing things after getting so
blocked with the object stuff, I've started adding some of the
utility ops we've been missing.

This time, the halfpop[insp] ops are in. These ops pop off a frame of
saved registers, but only restore registers 16-31. The chunk of the
frame for registers 0-15 is discarded.

Given that the calling conventions mandate things only in registers
0-15, this should (hopefully) make function/sub/method calls a bit
easier to deal with.
--
Dan

--------------------------------------"it's like this"-------------------
Dan Sugalski even samurai
d...@sidhe.org have teddy bears and even
teddy bears get drunk

[Simon Glover]

This code:

---------------------

set S15, "A"
set S16, "B"

pushs
set S15, "C"
set S16, "D"

print S15
print S16
print "\n"

halfpops

print S15
print S16
print "\n"

end

----------------

currently prints:

CD
C

when I'd expect it to print:

CD
CB

Is my expectation wrong, or is this a bug?

Simon

[Dan Sugalski]

Bug, apparently. I'll go poke around and see what's going on. I'm
presuming I messed up the offset math or something so the restore's
not being done properly.