Michael Collison <colli...@rivosinc.com> writes:
> While working on autovectorizing for the RISCV port I encountered an issue
> where can_duplicate_and_interleave_p assumes that GET_MODE_NUNITS is a
> evenly divisible by two. The RISC-V target has vector modes (e.g. VNx1DImode),
> where GET_MODE_NUNITS is equal to one.
>
> Tested on RISCV and x86_64-linux-gnu. Okay?
>
> 2023-03-09 Michael Collison <colli...@rivosinc.com>
>
> * tree-vect-slp.cc (can_duplicate_and_interleave_p):
> Check that GET_MODE_NUNITS is a multiple of 2.
OK, thanks. Doesn't need to wait for any other of the other patches
in the series.
Richard
> ---
> gcc/tree-vect-slp.cc | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
> index d73deaecce0..a64fe454e19 100644
> --- a/gcc/tree-vect-slp.cc
> +++ b/gcc/tree-vect-slp.cc
> @@ -423,10 +423,13 @@ can_duplicate_and_interleave_p (vec_info *vinfo,
> unsigned int count,
> (GET_MODE_BITSIZE (int_mode), 1);
> tree vector_type
> = get_vectype_for_scalar_type (vinfo, int_type, count);
> + poly_int64 half_nelts;
> if (vector_type
> && VECTOR_MODE_P (TYPE_MODE (vector_type))
> && known_eq (GET_MODE_SIZE (TYPE_MODE (vector_type)),
> - GET_MODE_SIZE (base_vector_mode)))
> + GET_MODE_SIZE (base_vector_mode))
> + && multiple_p (GET_MODE_NUNITS (TYPE_MODE (vector_type)),
> + 2, &half_nelts))
> {
> /* Try fusing consecutive sequences of COUNT / NVECTORS elements
> together into elements of type INT_TYPE and using the result
> @@ -434,7 +437,7 @@ can_duplicate_and_interleave_p (vec_info *vinfo, unsigned
> int count,
> poly_uint64 nelts = GET_MODE_NUNITS (TYPE_MODE (vector_type));
> vec_perm_builder sel1 (nelts, 2, 3);
> vec_perm_builder sel2 (nelts, 2, 3);
> - poly_int64 half_nelts = exact_div (nelts, 2);
> +
> for (unsigned int i = 0; i < 3; ++i)
> {
> sel1.quick_push (i);
