Hi, Richi.
Thanks so much. I have addressed comments and sent V3 patch:
https://gcc.gnu.org/pipermail/gcc-patches/2023-July/623566.html
Thanks.
juzhe.zh...@rivai.ai
From: Richard Biener
Date: 2023-07-04 17:27
To: Ju-Zhe Zhong
CC: gcc-patches; richard.sandiford
Subject: Re: [PATCH V2] VECT: Apply LEN_MASK_GATHER_LOAD/SCATTER_STORE into
vectorizer
On Tue, 4 Jul 2023, juzhe.zh...@rivai.ai wrote:
> From: Ju-Zhe Zhong <juzhe.zh...@rivai.ai>
>
> Hi, Richard and Richi.
>
> The len_mask_gather_load/len_mask_scatter_store patterns have been added.
> Now, this patch applies them into vectorizer.
>
> Here is the example:
>
> void
> f (int *restrict a,
> int *restrict b, int n,
> int base, int step,
> int *restrict cond)
> {
> for (int i = 0; i < n; ++i)
> {
> if (cond[i])
> a[i * 4] = b[i];
> }
> }
>
> Gimple IR:
>
> <bb 3> [local count: 105119324]:
> _58 = (unsigned long) n_13(D);
>
> <bb 4> [local count: 630715945]:
> # vectp_cond.7_45 = PHI <vectp_cond.7_46(4), cond_14(D)(3)>
> # vectp_b.11_51 = PHI <vectp_b.11_52(4), b_15(D)(3)>
> # vectp_a.14_55 = PHI <vectp_a.14_56(4), a_16(D)(3)>
> # ivtmp_59 = PHI <ivtmp_60(4), _58(3)>
> _61 = .SELECT_VL (ivtmp_59, POLY_INT_CST [2, 2]);
> ivtmp_44 = _61 * 4;
> vect__4.9_47 = .LEN_MASK_LOAD (vectp_cond.7_45, 32B, _61, 0, { -1, ... });
> mask__24.10_49 = vect__4.9_47 != { 0, ... };
> vect__8.13_53 = .LEN_MASK_LOAD (vectp_b.11_51, 32B, _61, 0, mask__24.10_49);
> ivtmp_54 = _61 * 16;
> .LEN_MASK_SCATTER_STORE (vectp_a.14_55, { 0, 16, 32, ... }, 1,
> vect__8.13_53, _61, 0, mask__24.10_49);
> vectp_cond.7_46 = vectp_cond.7_45 + ivtmp_44;
> vectp_b.11_52 = vectp_b.11_51 + ivtmp_44;
> vectp_a.14_56 = vectp_a.14_55 + ivtmp_54;
> ivtmp_60 = ivtmp_59 - _61;
> if (ivtmp_60 != 0)
> goto <bb 4>; [83.33%]
> else
> goto <bb 5>; [16.67%]
>
> gcc/ChangeLog:
>
> * optabs-query.cc (supports_vec_gather_load_p): Apply
> LEN_MASK_GATHER_LOAD/SCATTER_STORE into vectorizer.
> (supports_vec_scatter_store_p): Ditto.
> * tree-vect-data-refs.cc (vect_gather_scatter_fn_p): Ditto.
> * tree-vect-stmts.cc (check_load_store_for_partial_vectors): Ditto.
> (vect_get_strided_load_store_ops): Ditto.
> (vectorizable_store): Ditto.
> (vectorizable_load): Ditto.
>
> ---
> gcc/optabs-query.cc | 2 +
> gcc/tree-vect-data-refs.cc | 15 +++-
> gcc/tree-vect-stmts.cc | 136 ++++++++++++++++++++++++++++++++-----
> 3 files changed, 134 insertions(+), 19 deletions(-)
>
> diff --git a/gcc/optabs-query.cc b/gcc/optabs-query.cc
> index 2fdd0d34354..bf1f484e874 100644
> --- a/gcc/optabs-query.cc
> +++ b/gcc/optabs-query.cc
> @@ -676,6 +676,7 @@ supports_vec_gather_load_p (machine_mode mode)
> this_fn_optabs->supports_vec_gather_load[mode]
> = (supports_vec_convert_optab_p (gather_load_optab, mode)
> || supports_vec_convert_optab_p (mask_gather_load_optab, mode)
> + || supports_vec_convert_optab_p (len_mask_gather_load_optab, mode)
> ? 1 : -1);
>
> return this_fn_optabs->supports_vec_gather_load[mode] > 0;
> @@ -692,6 +693,7 @@ supports_vec_scatter_store_p (machine_mode mode)
> this_fn_optabs->supports_vec_scatter_store[mode]
> = (supports_vec_convert_optab_p (scatter_store_optab, mode)
> || supports_vec_convert_optab_p (mask_scatter_store_optab, mode)
> + || supports_vec_convert_optab_p (len_mask_scatter_store_optab, mode)
> ? 1 : -1);
>
> return this_fn_optabs->supports_vec_scatter_store[mode] > 0;
> diff --git a/gcc/tree-vect-data-refs.cc b/gcc/tree-vect-data-refs.cc
> index ebe93832b1e..8d32eb3c83b 100644
> --- a/gcc/tree-vect-data-refs.cc
> +++ b/gcc/tree-vect-data-refs.cc
> @@ -3873,16 +3873,24 @@ vect_gather_scatter_fn_p (vec_info *vinfo, bool
> read_p, bool masked_p,
> return false;
>
> /* Work out which function we need. */
> - internal_fn ifn, alt_ifn;
> + internal_fn ifn, alt_ifn, len_mask_ifn;
> if (read_p)
> {
> ifn = masked_p ? IFN_MASK_GATHER_LOAD : IFN_GATHER_LOAD;
> alt_ifn = IFN_MASK_GATHER_LOAD;
> + /* When target supports LEN_MASK_GATHER_LOAD, we always
> + use LEN_MASK_GATHER_LOAD regardless whether len and
> + mask are valid or not. */
> + len_mask_ifn = IFN_LEN_MASK_GATHER_LOAD;
> }
> else
> {
> ifn = masked_p ? IFN_MASK_SCATTER_STORE : IFN_SCATTER_STORE;
> alt_ifn = IFN_MASK_SCATTER_STORE;
> + /* When target supports LEN_MASK_SCATTER_STORE, we always
> + use LEN_MASK_SCATTER_STORE regardless whether len and
> + mask are valid or not. */
> + len_mask_ifn = IFN_LEN_MASK_SCATTER_STORE;
> }
>
> for (;;)
> @@ -3893,7 +3901,10 @@ vect_gather_scatter_fn_p (vec_info *vinfo, bool
> read_p, bool masked_p,
>
> /* Test whether the target supports this combination. */
> if (internal_gather_scatter_fn_supported_p (ifn, vectype, memory_type,
> - offset_vectype, scale))
> + offset_vectype, scale)
> + || internal_gather_scatter_fn_supported_p (len_mask_ifn, vectype,
> + memory_type,
> + offset_vectype, scale))
> {
> *ifn_out = ifn;
I think *ifn_out should be len_mask_ifn if that matched, so instead add
an else if just like we do for alt_ifn?
> *offset_vectype_out = offset_vectype;
> diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
> index a0c39268bf0..1f607b7102b 100644
> --- a/gcc/tree-vect-stmts.cc
> +++ b/gcc/tree-vect-stmts.cc
> @@ -1771,6 +1771,18 @@ check_load_store_for_partial_vectors (loop_vec_info
> loop_vinfo, tree vectype,
> gs_info->offset_vectype,
> gs_info->scale))
> {
> + ifn = (is_load
> + ? IFN_LEN_MASK_GATHER_LOAD
> + : IFN_LEN_MASK_SCATTER_STORE);
> + if (internal_gather_scatter_fn_supported_p (ifn, vectype,
> + gs_info->memory_type,
> + gs_info->offset_vectype,
> + gs_info->scale))
> + {
> + vec_loop_lens *lens = &LOOP_VINFO_LENS (loop_vinfo);
> + vect_record_loop_len (loop_vinfo, lens, nvectors, vectype, 1);
> + return;
> + }
> if (dump_enabled_p ())
> dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
> "can't operate on partial vectors because"
> @@ -3129,16 +3141,39 @@ vect_get_gather_scatter_ops (loop_vec_info loop_vinfo,
> static void
> vect_get_strided_load_store_ops (stmt_vec_info stmt_info,
> loop_vec_info loop_vinfo,
> + gimple_stmt_iterator *gsi,
> gather_scatter_info *gs_info,
> - tree *dataref_bump, tree *vec_offset)
> + tree *dataref_bump, tree *vec_offset,
> + vec_loop_lens *loop_lens)
> {
> struct data_reference *dr = STMT_VINFO_DATA_REF (stmt_info);
> tree vectype = STMT_VINFO_VECTYPE (stmt_info);
>
> - tree bump = size_binop (MULT_EXPR,
> - fold_convert (sizetype, unshare_expr (DR_STEP (dr))),
> - size_int (TYPE_VECTOR_SUBPARTS (vectype)));
> - *dataref_bump = cse_and_gimplify_to_preheader (loop_vinfo, bump);
> + if (LOOP_VINFO_USING_SELECT_VL_P (loop_vinfo))
> + {
> + /* _31 = .SELECT_VL (ivtmp_29, POLY_INT_CST [4, 4]);
> + ivtmp_8 = _31 * 16 (step in bytes);
> + .LEN_MASK_SCATTER_STORE (vectp_a.9_7, ... );
> + vectp_a.9_26 = vectp_a.9_7 + ivtmp_8; */
> + tree loop_len
> + = vect_get_loop_len (loop_vinfo, gsi, loop_lens, 1, vectype, 0, 0);
> + tree tmp
> + = fold_build2 (MULT_EXPR, sizetype,
> + fold_convert (sizetype, unshare_expr (DR_STEP (dr))),
> + loop_len);
> + tree bump = make_temp_ssa_name (sizetype, NULL, "ivtmp");
> + gassign *assign = gimple_build_assign (bump, tmp);
> + gsi_insert_before (gsi, assign, GSI_SAME_STMT);
> + *dataref_bump = bump;
> + }
> + else
> + {
> + tree bump
> + = size_binop (MULT_EXPR,
> + fold_convert (sizetype, unshare_expr (DR_STEP (dr))),
> + size_int (TYPE_VECTOR_SUBPARTS (vectype)));
> + *dataref_bump = cse_and_gimplify_to_preheader (loop_vinfo, bump);
> + }
>
> /* The offset given in GS_INFO can have pointer type, so use the element
> type of the vector instead. */
> @@ -8685,8 +8720,8 @@ vectorizable_store (vec_info *vinfo,
> else if (memory_access_type == VMAT_GATHER_SCATTER)
> {
> aggr_type = elem_type;
> - vect_get_strided_load_store_ops (stmt_info, loop_vinfo, &gs_info,
> - &bump, &vec_offset);
> + vect_get_strided_load_store_ops (stmt_info, loop_vinfo, gsi, &gs_info,
> + &bump, &vec_offset, loop_lens);
> }
> else
> {
> @@ -8915,6 +8950,8 @@ vectorizable_store (vec_info *vinfo,
> unsigned HOST_WIDE_INT align;
>
> tree final_mask = NULL_TREE;
> + tree final_len = NULL_TREE;
> + tree bias = NULL_TREE;
> if (loop_masks)
> final_mask = vect_get_loop_mask (loop_vinfo, gsi, loop_masks,
> vec_num * ncopies,
> @@ -8929,8 +8966,43 @@ vectorizable_store (vec_info *vinfo,
> if (STMT_VINFO_GATHER_SCATTER_P (stmt_info))
> vec_offset = vec_offsets[vec_num * j + i];
> tree scale = size_int (gs_info.scale);
> +
> + if (internal_gather_scatter_fn_supported_p (
> + IFN_LEN_MASK_SCATTER_STORE, vectype, gs_info.memory_type,
> + TREE_TYPE (vec_offset), gs_info.scale))
gs_info.ifn should have recorded the appropriate ifn, so you should
be able to simplify this.
> + {
> + if (loop_lens)
> + {
> + final_len
> + = vect_get_loop_len (loop_vinfo, gsi, loop_lens,
> + vec_num * ncopies, vectype,
> + vec_num * j + i, 1);
> + }
> + else
> + {
> + tree iv_type = LOOP_VINFO_RGROUP_IV_TYPE (loop_vinfo);
> + final_len
> + = build_int_cst (iv_type,
> + TYPE_VECTOR_SUBPARTS (vectype));
> + }
> + signed char biasval
> + = LOOP_VINFO_PARTIAL_LOAD_STORE_BIAS (loop_vinfo);
> + bias = build_int_cst (intQI_type_node, biasval);
> + if (!final_mask)
> + {
> + mask_vectype = truth_type_for (vectype);
> + final_mask = build_minus_one_cst (mask_vectype);
> + }
> + }
> +
> gcall *call;
> - if (final_mask)
> + if (final_len && final_len)
> + call
> + = gimple_build_call_internal (IFN_LEN_MASK_SCATTER_STORE,
> + 7, dataref_ptr, vec_offset,
> + scale, vec_oprnd, final_len,
> + bias, final_mask);
> + else if (final_mask)
> call = gimple_build_call_internal
> (IFN_MASK_SCATTER_STORE, 5, dataref_ptr, vec_offset,
> scale, vec_oprnd, final_mask);
> @@ -9047,9 +9119,6 @@ vectorizable_store (vec_info *vinfo,
> machine_mode vmode = TYPE_MODE (vectype);
> machine_mode new_vmode = vmode;
> internal_fn partial_ifn = IFN_LAST;
> - /* Produce 'len' and 'bias' argument. */
> - tree final_len = NULL_TREE;
> - tree bias = NULL_TREE;
> if (loop_lens)
> {
> opt_machine_mode new_ovmode
> @@ -10177,8 +10246,8 @@ vectorizable_load (vec_info *vinfo,
> else if (memory_access_type == VMAT_GATHER_SCATTER)
> {
> aggr_type = elem_type;
> - vect_get_strided_load_store_ops (stmt_info, loop_vinfo, &gs_info,
> - &bump, &vec_offset);
> + vect_get_strided_load_store_ops (stmt_info, loop_vinfo, gsi, &gs_info,
> + &bump, &vec_offset, loop_lens);
> }
> else
> {
> @@ -10339,6 +10408,8 @@ vectorizable_load (vec_info *vinfo,
> for (i = 0; i < vec_num; i++)
> {
> tree final_mask = NULL_TREE;
> + tree final_len = NULL_TREE;
> + tree bias = NULL_TREE;
> if (loop_masks
> && memory_access_type != VMAT_INVARIANT)
> final_mask = vect_get_loop_mask (loop_vinfo, gsi, loop_masks,
> @@ -10368,8 +10439,42 @@ vectorizable_load (vec_info *vinfo,
> vec_offset = vec_offsets[vec_num * j + i];
> tree zero = build_zero_cst (vectype);
> tree scale = size_int (gs_info.scale);
> +
> + if (internal_gather_scatter_fn_supported_p (
> + IFN_LEN_MASK_GATHER_LOAD, vectype,
> + gs_info.memory_type, TREE_TYPE (vec_offset),
> + gs_info.scale))
Likewise.
> + {
> + if (loop_lens)
> + {
> + final_len = vect_get_loop_len (
> + loop_vinfo, gsi, loop_lens, vec_num * ncopies,
> + vectype, vec_num * j + i, 1);
> + }
> + else
> + {
> + tree iv_type
> + = LOOP_VINFO_RGROUP_IV_TYPE (loop_vinfo);
> + final_len = build_int_cst (
> + iv_type, TYPE_VECTOR_SUBPARTS (vectype));
> + }
> + signed char biasval
> + = LOOP_VINFO_PARTIAL_LOAD_STORE_BIAS (loop_vinfo);
> + bias = build_int_cst (intQI_type_node, biasval);
> + if (!final_mask)
> + {
> + mask_vectype = truth_type_for (vectype);
> + final_mask = build_minus_one_cst (mask_vectype);
> + }
> + }
> +
> gcall *call;
> - if (final_mask)
> + if (final_len && final_mask)
> + call = gimple_build_call_internal (
> + IFN_LEN_MASK_GATHER_LOAD, 7, dataref_ptr,
> + vec_offset, scale, zero, final_len, bias,
> + final_mask);
> + else if (final_mask)
> call = gimple_build_call_internal
> (IFN_MASK_GATHER_LOAD, 5, dataref_ptr,
> vec_offset, scale, zero, final_mask);
> @@ -10462,9 +10567,6 @@ vectorizable_load (vec_info *vinfo,
> machine_mode vmode = TYPE_MODE (vectype);
> machine_mode new_vmode = vmode;
> internal_fn partial_ifn = IFN_LAST;
> - /* Produce 'len' and 'bias' argument. */
> - tree final_len = NULL_TREE;
> - tree bias = NULL_TREE;
> if (loop_lens)
> {
> opt_machine_mode new_ovmode
>
--
Richard Biener <rguent...@suse.de>
SUSE Software Solutions Germany GmbH, Frankenstrasse 146, 90461 Nuernberg,
Germany; GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman;
HRB 36809 (AG Nuernberg)
