> SPEC 2017 wrf benchmark expose unreasonble memory usage of VSETVL PASS
> that is, VSETVL PASS consume over 33 GB memory which make use impossible
> to compile SPEC 2017 wrf in a laptop.
>
> The root cause is wasting-memory variables:
LGTM. The new code matches compute_lcm_local_properties more
closely which makes sense to me.
One separate thing, nothing to do with this patch - I find
bitmap_union_of_preds_with_entry not wrong but weirdly written.
Probably because it was copied from somewhere and slightly
adjusted? If you touch more code anyway, would you mind fixing it?
for (ix = 0; ix < EDGE_COUNT (b->preds); ix++)
{
e = EDGE_PRED (b, ix);
bitmap_copy (dst, src[e->src->index]);
break;
}
if (ix == EDGE_COUNT (b->preds))
bitmap_clear (dst);
The whole idea seems to _not_ skip the entry block. So something
like if (EDGE_COUNT () == 0) {...} else { bitmap_copy (...)) should
be sufficient? If the input is assumed to be empty we could even
skip the copy.
> -/* { dg-options "--param=riscv-autovec-preference=scalable -march=rv32gcv
> -mabi=ilp32 -fno-schedule-insns -fno-schedule-insns2 -fno-tree-vectorize" } */
> +/* { dg-options "--param=riscv-autovec-preference=scalable -march=rv32gcv
> -mabi=ilp32 -fno-tree-vectorize" } */
Why that change? Was no-schedule necessary before and is not anymore?
Is it a result from the changes? I'd hope not.
Regards
Robin
