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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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30
amd64/isel.c
View file

@ -203,7 +203,6 @@ sel(Ins i, ANum *an, Fn *fn)
{
Ref r0, r1, tmp[7];
int x, j, k, kc, sh, swap;
int64_t sz;
Ins *i0, *i1;
if (rtype(i.to) == RTmp)
@ -375,31 +374,10 @@ Emit:
fixarg(&i1->arg[0], argcls(&i, 0), i1, fn);
fixarg(&i1->arg[1], argcls(&i, 1), i1, fn);
break;
case Oalloc:
case Oalloc+1:
case Oalloc+2: /* == Oalloc1 */
/* 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 || sz >= INT_MAX-15)
err("invalid alloc size %"PRId64, sz);
sz = (sz + 15) & -16;
emit(Osalloc, Kl, i.to, getcon(sz, fn), R);
} 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);
}
case Oalloc4:
case Oalloc8:
case Oalloc16:
salloc(i.to, i.arg[0], fn);
break;
default:
if (isext(i.op))