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add crippled dce to the allocator

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This commit is contained in:
Quentin Carbonneaux 2015-07-27 14:57:56 -04:00
parent 8899449c39
commit 854ecd4009
3 changed files with 20 additions and 7 deletions
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25
lisc/rega.c
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@ -256,7 +256,7 @@ rega(Fn *fn)
/* process instructions */
end[n] = cur;
if (debug['R']) {
fprintf(stderr, "\tend %-10s ", b->name);
fprintf(stderr, "\t%-10s end", b->name);
mdump(&cur);
}
if (rtype(b->jmp.arg) == RSym)
@ -270,8 +270,11 @@ rega(Fn *fn)
}
if (!req(i->to, R)) {
r = rfree(&cur, i->to.val);
if (r)
i->to = SYM(r);
if (!r) {
*i = (Ins){ONop, R, {R, R}};
continue;
}
i->to = SYM(r);
}
if (rtype(i->arg[0]) == RSym) {
/* <arch>
@ -301,9 +304,13 @@ rega(Fn *fn)
}
}
if (debug['R']) {
fprintf(stderr, "\tbeg %-10s ", b->name);
fprintf(stderr, "\t beg");
mdump(&cur);
}
b->in = cur.bt;
for (p=b->phi; p; p=p->link)
if (rtype(p->to) == RSym)
BCLR(b->in, p->to.val);
beg[n] = cur;
}
if (debug['R'])
@ -318,14 +325,18 @@ rega(Fn *fn)
for (p=s->phi; p; p=p->link) {
assert(rtype(p->to) == RSlot
|| rtype(p->to) == RSym);
dst = p->to;
if (rtype(dst) == RSym) {
r = rfind(&beg[s->id], dst.val);
if (!r)
continue;
dst = SYM(r);
}
for (a=0; p->blk[a]!=b; a++)
assert(a+1 < p->narg);
dst = p->to;
src = p->arg[a];
if (rtype(src) == RSym)
src = rref(&end[b->id], src.val);
if (rtype(dst) == RSym)
dst = rref(&beg[s->id], dst.val);
pmadd(src, dst);
}
for (t=Tmp0; t<fn->ntmp; t++)