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add nmem to opdesc for use in the spiller

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This new machine-independent mechanism might not be general
enough in the long term but, now, it provides a flexible way
to inform the spiller about the maximum number of arguments
of an instruction that can be spill locations.
This commit is contained in:
Quentin Carbonneaux 2015-08-08 18:06:47 -04:00
parent 9966a181c1
commit 76bf96b268
4 changed files with 36 additions and 34 deletions
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28
lisc/spill.c
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@ -223,7 +223,7 @@ limit(Bits *b, int k, Bits *fst)
return t;
}
static void
static int
setloc(Ref *pr, Bits *v, Bits *w)
{
int t;
@ -242,7 +242,7 @@ setloc(Ref *pr, Bits *v, Bits *w)
BSET(br, pr->val);
}
if (rtype(*pr) != RTmp)
return;
return 0;
t = pr->val;
BSET(*v, t);
if (limit(v, nreg, w) == t)
@ -250,10 +250,13 @@ setloc(Ref *pr, Bits *v, Bits *w)
* it was not live so we don't
* have to reload it */
curi++;
if (!BGET(*v, t))
if (!BGET(*v, t)) {
*pr = slot(t);
else
return 1;
} else {
BSET(*w, t);
return 0;
}
}
/* spill code insertion
@ -361,18 +364,13 @@ spill(Fn *fn)
case -1:;
}
w = (Bits){{0}};
setloc(&i->arg[0], &v, &w);
if (i->op == OXCmpw || i->op == OXCmpl)
if (rtype(i->arg[0]) == RSlot) {
/* <arch>
* we make sure that comparisons
* do not get their two operands
* in memory slots
*/
assert(rtype(i->arg[1]) == RTmp);
j = opdesc[i->op].nmem;
if (!j && rtype(i->arg[0]) == RTmp)
BSET(w, i->arg[0].val);
j -= setloc(&i->arg[0], &v, &w);
if (!j && rtype(i->arg[1]) == RTmp)
BSET(w, i->arg[1].val);
}
setloc(&i->arg[1], &v, &w);
j -= setloc(&i->arg[1], &v, &w);
if (s)
emit(OStore, R, i->to, SLOT(s));
emit(i->op, i->to, i->arg[0], i->arg[1]);