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dynamic stack allocs for arm64

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I also moved some isel logic
that would have been repeated
a third time in util.c.
This commit is contained in:
Quentin Carbonneaux 2022-03-14 23:10:39 +01:00
parent 329a18a30b
commit c5769f62b4
6 changed files with 63 additions and 65 deletions
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48
rv64/isel.c
View file

@ -174,46 +174,20 @@ selcmp(Ins i, int k, int op, Fn *fn)
static void
sel(Ins i, Fn *fn)
{
Ref r0, r1;
Ins *i0;
int ck, cc;
int64_t sz;
switch (i.op) {
case Onop:
break;
case Oalloc4:
case Oalloc8:
case Oalloc16:
/* we need to make sure
* the stack remains aligned
* (rsp = 0) mod 16
*/
fn->dynalloc = 1;
if (rtype(i.arg[0]) == RCon) {
sz = fn->con[i.arg[0].val].bits.i;
if (sz < 0)
err("invalid alloc size %"PRId64, sz);
sz = (sz + 15) & -16;
emit(Osalloc, Kl, i.to, getcon(sz, fn), R);
fixarg(&curi->arg[0], Kl, curi, fn);
} else {
/* r0 = (i.arg[0] + 15) & -16 */
r0 = newtmp("isel", Kl, fn);
r1 = newtmp("isel", Kl, fn);
emit(Osalloc, Kl, i.to, r0, R);
emit(Oand, Kl, r0, r1, getcon(-16, fn));
emit(Oadd, Kl, r1, i.arg[0], getcon(15, fn));
if (fn->tmp[i.arg[0].val].slot != -1)
err("unlikely argument %%%s in %s",
fn->tmp[i.arg[0].val].name, optab[i.op].name);
}
break;
default:
if (iscmp(i.op, &ck, &cc)) {
selcmp(i, ck, cc, fn);
break;
}
if (INRANGE(i.op, Oalloc, Oalloc1)) {
i0 = curi - 1;
salloc(i.to, i.arg[0], fn);
fixarg(&i0->arg[0], Kl, i0, fn);
return;
}
if (iscmp(i.op, &ck, &cc)) {
selcmp(i, ck, cc, fn);
return;
}
if (i.op != Onop) {
emiti(i);
i0 = curi; /* fixarg() can change curi */
fixarg(&i0->arg[0], argcls(&i, 0), i0, fn);