Hi Aldy,
On Mon, Jul 17 2023, Aldy Hernandez wrote:
> Currently IPA throws away the known 1 bits because VRP and irange have
> traditionally only had a way of tracking known 0s (set_nonzero_bits).
> With the ability to keep all the known bits in the irange, we can now
> save this between passes.
>
> OK?
>
> gcc/ChangeLog:
>
> * ipa-prop.cc (ipcp_update_bits): Export value/mask known bits.
OK, thanks.
Martin
> ---
> gcc/ipa-prop.cc | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/gcc/ipa-prop.cc b/gcc/ipa-prop.cc
> index d2b998f8af5..5d790ff1265 100644
> --- a/gcc/ipa-prop.cc
> +++ b/gcc/ipa-prop.cc
> @@ -5853,10 +5853,9 @@ ipcp_update_bits (struct cgraph_node *node,
> ipcp_transformation *ts)
> {
> unsigned prec = TYPE_PRECISION (TREE_TYPE (ddef));
> signop sgn = TYPE_SIGN (TREE_TYPE (ddef));
> -
> - wide_int nonzero_bits = wide_int::from (bits[i]->mask, prec, UNSIGNED)
> - | wide_int::from (bits[i]->value, prec, sgn);
> - set_nonzero_bits (ddef, nonzero_bits);
> + wide_int mask = wide_int::from (bits[i]->mask, prec, UNSIGNED);
> + wide_int value = wide_int::from (bits[i]->value, prec, sgn);
> + set_bitmask (ddef, value, mask);
> }
> else
> {
> --
> 2.40.1
