I tree-vect-slp.cc: vect_get_and_check_slp_defs 711: tree type = TREE_TYPE (oprnd); dt = dts[i]; if ((dt == vect_constant_def || dt == vect_external_def) && !GET_MODE_SIZE (vinfo->vector_mode).is_constant () && (TREE_CODE (type) == BOOLEAN_TYPE || !can_duplicate_and_interleave_p (vinfo, stmts.length (), type))) { if (dump_enabled_p ()) dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location, "Build SLP failed: invalid type of def " "for variable-length SLP %T\n", oprnd); return -1; } Here mask = -1 is BOOLEAN type in tree-vect-patterns.cc reaching this condition, then SLP failed: Build SLP failed: invalid type of def juzhe.zhong@rivai.ai From: Richard Biener Date: 2023-10-12 17:44 To: 钟居哲 CC: gcc-patches; richard.sandiford Subject: Re: Re: [PATCH] VECT: Enhance SLP of MASK_LEN_GATHER_LOAD[PR111721] On Thu, 12 Oct 2023, ??? wrote: > Thanks Richi point it out. > > I found this patch can't make conditional gather load succeed on SLP. > > I am considering change MASK_LEN_GATHER_LOAD in pattern recognization: > > If no condition mask, in tree-vect-patterns.cc, I build MASK_LEN_GATHER_LOAD (ptr, offset, scale, 0) -> 4 arguments same as GATHER_LOAD. > In this situation, MASK_LEN_GATHER_LOAD can resue the GATHER_LOAD SLP flow naturally. > > If has condition mask, in tree-vect-patterns.cc, I build MASK_LEN_GATHER_LOAD (ptr, offset, scale, 0, condition) -> 5 arguments same as MASK_GATHER_LOAD. > In this situation, MASK_LEN_GATHER_LOAD can resue the MASK_GATHER_LOAD SLP flow naturally. > > Is it reasonable ? What's wrong with handling MASK_LEN_GATHER_LOAD with all arguments even when the mask is -1? > > juzhe.zhong@rivai.ai > > From: Richard Biener > Date: 2023-10-11 20:50 > To: Juzhe-Zhong > CC: gcc-patches; richard.sandiford > Subject: Re: [PATCH] VECT: Enhance SLP of MASK_LEN_GATHER_LOAD[PR111721] > On Wed, 11 Oct 2023, Juzhe-Zhong wrote: > > > This patch fixes this following FAILs in RISC-V regression: > > > > FAIL: gcc.dg/vect/vect-gather-1.c -flto -ffat-lto-objects scan-tree-dump vect "Loop contains only SLP stmts" > > FAIL: gcc.dg/vect/vect-gather-1.c scan-tree-dump vect "Loop contains only SLP stmts" > > FAIL: gcc.dg/vect/vect-gather-3.c -flto -ffat-lto-objects scan-tree-dump vect "Loop contains only SLP stmts" > > FAIL: gcc.dg/vect/vect-gather-3.c scan-tree-dump vect "Loop contains only SLP stmts" > > > > The root cause of these FAIL is that GCC SLP failed on MASK_LEN_GATHER_LOAD. > > > > Since for RVV, we build MASK_LEN_GATHER_LOAD with dummy mask (-1) in tree-vect-patterns.cc if it is same > > situation as GATHER_LOAD (no conditional mask). > > > > So we make MASK_LEN_GATHER_LOAD leverage the flow of GATHER_LOAD if mask argument is a dummy mask. > > > > gcc/ChangeLog: > > > > * tree-vect-slp.cc (vect_get_operand_map): > > (vect_build_slp_tree_1): > > (vect_build_slp_tree_2): > > * tree-vect-stmts.cc (vectorizable_load): > > > > --- > > gcc/tree-vect-slp.cc | 18 ++++++++++++++++-- > > gcc/tree-vect-stmts.cc | 4 ++-- > > 2 files changed, 18 insertions(+), 4 deletions(-) > > > > diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc > > index fa098f9ff4e..712c04ec278 100644 > > --- a/gcc/tree-vect-slp.cc > > +++ b/gcc/tree-vect-slp.cc > > @@ -544,6 +544,17 @@ vect_get_operand_map (const gimple *stmt, unsigned char swap = 0) > > case IFN_MASK_GATHER_LOAD: > > return arg1_arg4_map; > > > > + case IFN_MASK_LEN_GATHER_LOAD: > > + /* In tree-vect-patterns.cc, we will have these 2 situations: > > + > > + - Unconditional gather load transforms > > + into MASK_LEN_GATHER_LOAD with dummy mask which is -1. > > + > > + - Conditional gather load transforms > > + into MASK_LEN_GATHER_LOAD with real conditional mask.*/ > > + return integer_minus_onep (gimple_call_arg (call, 4)) ? arg1_map > > + : nullptr; > > + > > case IFN_MASK_STORE: > > return arg3_arg2_map; > > > > @@ -1077,7 +1088,8 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap, > > > > if (cfn == CFN_MASK_LOAD > > || cfn == CFN_GATHER_LOAD > > - || cfn == CFN_MASK_GATHER_LOAD) > > + || cfn == CFN_MASK_GATHER_LOAD > > + || cfn == CFN_MASK_LEN_GATHER_LOAD) > > ldst_p = true; > > else if (cfn == CFN_MASK_STORE) > > { > > @@ -1337,6 +1349,7 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap, > > if (DR_IS_READ (STMT_VINFO_DATA_REF (stmt_info)) > > && rhs_code != CFN_GATHER_LOAD > > && rhs_code != CFN_MASK_GATHER_LOAD > > + && rhs_code != CFN_MASK_LEN_GATHER_LOAD > > /* Not grouped loads are handled as externals for BB > > vectorization. For loop vectorization we can handle > > splats the same we handle single element interleaving. */ > > @@ -1837,7 +1850,8 @@ vect_build_slp_tree_2 (vec_info *vinfo, slp_tree node, > > if (gcall *stmt = dyn_cast (stmt_info->stmt)) > > gcc_assert (gimple_call_internal_p (stmt, IFN_MASK_LOAD) > > || gimple_call_internal_p (stmt, IFN_GATHER_LOAD) > > - || gimple_call_internal_p (stmt, IFN_MASK_GATHER_LOAD)); > > + || gimple_call_internal_p (stmt, IFN_MASK_GATHER_LOAD) > > + || gimple_call_internal_p (stmt, IFN_MASK_LEN_GATHER_LOAD)); > > else > > { > > *max_nunits = this_max_nunits; > > diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc > > index cd7c1090d88..263acf5d3cd 100644 > > --- a/gcc/tree-vect-stmts.cc > > +++ b/gcc/tree-vect-stmts.cc > > @@ -9575,9 +9575,9 @@ vectorizable_load (vec_info *vinfo, > > return false; > > > > mask_index = internal_fn_mask_index (ifn); > > - if (mask_index >= 0 && slp_node) > > + if (mask_index >= 0 && slp_node && internal_fn_len_index (ifn) < 0) > > mask_index = vect_slp_child_index_for_operand (call, mask_index); > > - if (mask_index >= 0 > > + if (mask_index >= 0 && internal_fn_len_index (ifn) < 0 > > && !vect_check_scalar_mask (vinfo, stmt_info, slp_node, mask_index, > > &mask, NULL, &mask_dt, &mask_vectype)) > > return false; > > You are ignoring the mask argument and here only handle it when the > IFN doesn't have a _LEN. This doesn't seem to be forward looking > to the point where you want to actually handle masked (aka conditional) > gather. > > Did you check that SLP is actually used to vectorize this? > > Richard. > > -- Richard Biener SUSE Software Solutions Germany GmbH, Frankenstrasse 146, 90461 Nuernberg, Germany; GF: Ivo Totev, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)