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improve global registers handling

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The register allocation now has stricter assertions
about global registers.  The stricter assertions
required changes in the spiller:  We now correctly
indicate to the register allocator what registers
are used by "ret" instructions.
This commit is contained in:
Quentin Carbonneaux 2017-03-29 00:16:46 -04:00
parent 02408ffd8f
commit 81e2fdacc5
2 changed files with 18 additions and 10 deletions
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12
rega.c
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@ -135,6 +135,7 @@ rfree(RMap *m, int t)
{
int i, r;
assert(t >= Tmp0 || !(BIT(t) & RGLOB));
if (!bshas(m->b, t))
return -1;
for (i=0; m->t[i] != t; i++)
@ -145,6 +146,7 @@ rfree(RMap *m, int t)
m->n--;
memmove(&m->t[i], &m->t[i+1], (m->n-i) * sizeof m->t[0]);
memmove(&m->r[i], &m->r[i+1], (m->n-i) * sizeof m->r[0]);
assert(t >= Tmp0 || t == r);
return r;
}
@ -385,13 +387,15 @@ doblk(Blk *b, RMap *cur)
default:
if (!req(i->to, R)) {
assert(rtype(i->to) == RTmp);
r = rfree(cur, i->to.val);
if (r == -1 && !isreg(i->to)) {
r = i->to.val;
if (r >= Tmp0 || !(BIT(r) & RGLOB))
r = rfree(cur, r);
if (r == -1) {
assert(!isreg(i->to));
*i = (Ins){.op = Onop};
continue;
}
if (i->to.val >= Tmp0)
i->to = TMP(r);
i->to = TMP(r);
}
break;
}