https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111156
--- Comment #21 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #18)
> diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
> index 7cf9504398c..8deeecfd4aa 100644
> --- a/gcc/tree-vect-slp.cc
> +++ b/gcc/tree-vect-slp.cc
> @@ -1280,8 +1280,11 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char
> *swap,
> && rhs_code.is_tree_code ()
> && (TREE_CODE_CLASS (tree_code (first_stmt_code))
> == tcc_comparison)
> - && (swap_tree_comparison (tree_code (first_stmt_code))
> - == tree_code (rhs_code)))
> + && ((swap_tree_comparison (tree_code (first_stmt_code))
> + == tree_code (rhs_code))
> + || ((TREE_CODE_CLASS (tree_code (alt_stmt_code))
> + == tcc_comparison)
> + && rhs_code == alt_stmt_code)))
> && !(STMT_VINFO_GROUPED_ACCESS (stmt_info)
> && (first_stmt_code == ARRAY_REF
> || first_stmt_code == BIT_FIELD_REF
>
> should get you SLP but:
>
> t.c:8:26: note: === vect_slp_analyze_operations ===
> t.c:8:26: note: ==> examining statement: pretmp_29 = *_28;
> t.c:8:26: missed: unsupported load permutation
> t.c:10:30: missed: not vectorized: relevant stmt not supported: pretmp_29
> = *_28;
>
> t.c:8:26: note: op template: pretmp_29 = *_28;
> t.c:8:26: note: stmt 0 pretmp_29 = *_28;
> t.c:8:26: note: stmt 1 pretmp_29 = *_28;
> t.c:8:26: note: load permutation { 0 0 }
hmm with that applied I get:
sve-mis.c:8:26: note: ==> examining statement: pretmp_29 = *_28;
sve-mis.c:8:26: note: Vectorizing an unaligned access.
sve-mis.c:8:26: note: vect_model_load_cost: unaligned supported by hardware.
sve-mis.c:8:26: note: vect_model_load_cost: inside_cost = 1, prologue_cost =
0 .
but it bails out at:
sve-mis.c:8:26: missed: Not using elementwise accesses due to variable
vectorization factor.
sve-mis.c:10:25: missed: not vectorized: relevant stmt not supported:
.MASK_STORE (_5, 8B, _27, pretmp_29);
sve-mis.c:8:26: missed: bad operation or unsupported loop bound.
for me
