On Mon, 26 Jun 2023, [email protected] wrote:
> From: Ju-Zhe Zhong <[email protected]>
>
> Hi, Richi. It seems that we use nunits which is len + bias to iterate then we
> can
> simplify the codes.
>
> Also, I fixed behavior of len_store,
>
> Before this patch:
> (len - bias) * BITS_PER_UNIT
> After this patch:
> (len + bias) * BITS_PER_UNIT
>
> gcc/ChangeLog:
>
> * tree-ssa-sccvn.cc (vn_reference_lookup_3): Add LEN_MASK_STORE and
> fix LEN_STORE.
>
> ---
> gcc/tree-ssa-sccvn.cc | 24 ++++++++++++++++++++++--
> 1 file changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
> index 11061a374a2..d66e75460ed 100644
> --- a/gcc/tree-ssa-sccvn.cc
> +++ b/gcc/tree-ssa-sccvn.cc
> @@ -3304,6 +3304,16 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void
> *data_,
> if (!tree_fits_uhwi_p (len) || !tree_fits_shwi_p (bias))
> return (void *)-1;
> break;
> + case IFN_LEN_MASK_STORE:
> + len = gimple_call_arg (call, 2);
> + bias = gimple_call_arg (call, 5);
> + if (!tree_fits_uhwi_p (len) || !tree_fits_shwi_p (bias))
> + return (void *)-1;
> + mask = gimple_call_arg (call, internal_fn_mask_index (fn));
> + mask = vn_valueize (mask);
> + if (TREE_CODE (mask) != VECTOR_CST)
> + return (void *)-1;
> + break;
> default:
> return (void *)-1;
> }
> @@ -3344,6 +3354,16 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void
> *data_,
> tree vectype = TREE_TYPE (def_rhs);
> unsigned HOST_WIDE_INT elsz
> = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (vectype)));
> + poly_uint64 nunits = TYPE_VECTOR_SUBPARTS (vectype);
> + if (len)
> + {
> + /* Since the following while condition known_lt
> + (mask_idx, nunits) will exit the while loop
> + when mask_idx > nunits.coeffs[0], we pick the
> + MIN (nunits.coeffs[0], len + bias). */
> + nunits = MIN (nunits.coeffs[0],
> + tree_to_uhwi (len) + tree_to_shwi (bias));
I think you can use ordered_min here? Alternatively doing ...
> + }
> if (mask)
> {
> HOST_WIDE_INT start = 0, length = 0;
> @@ -3373,7 +3393,7 @@ vn_reference_lookup_3 (ao_ref *ref, tree vuse, void
> *data_,
> length += elsz;
> mask_idx++;
> }
> - while (known_lt (mask_idx, TYPE_VECTOR_SUBPARTS (vectype)));
> + while (known_lt (mask_idx, nunits));
&& mask_id < len
would be possible.
Richard?
Thanks,
Richard.
