Hi, Richi.
I restrict as you said into vect_external_def.
Then this condition made SLP failed:
- 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;
So I add 'internal_fn_len_index (ifn) < 0' for MASK_LEN_GATHER_LOAD does not
check scalar mask.
Then ICE here:
vect_slp_analyze_node_operations
if (child
&& (SLP_TREE_DEF_TYPE (child) == vect_constant_def
|| SLP_TREE_DEF_TYPE (child) == vect_external_def)
/* Perform usual caching, note code-generation still
code-gens these nodes multiple times but we expect
to CSE them later. */
&& !visited_set.add (child))
{
visited_vec.safe_push (child);
/* ??? After auditing more code paths make a "default"
and push the vector type from NODE to all children
if it is not already set. */
/* Compute the number of vectors to be generated. */
tree vector_type = SLP_TREE_VECTYPE (child);
if (!vector_type)
{
/* For shifts with a scalar argument we don't need
to cost or code-generate anything.
??? Represent this more explicitely. */
gcc_assert ((STMT_VINFO_TYPE (SLP_TREE_REPRESENTATIVE (node))
----> assert FAILed.
== shift_vec_info_type)
&& j == 1);
continue;
}
Could you help me with that?
juzhe.zh...@rivai.ai
From: Richard Biener
Date: 2023-10-12 17:55
To: juzhe.zh...@rivai.ai
CC: gcc-patches; richard.sandiford
Subject: Re: Re: [PATCH] VECT: Enhance SLP of MASK_LEN_GATHER_LOAD[PR111721]
On Thu, 12 Oct 2023, juzhe.zh...@rivai.ai wrote:
> 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
I think this can be restricted to vect_external_def, but some history
might reveal the cases we put this code in for (we should be able to
materialize all constants?). At least uniform boolean constants
should be fine.
>
>
>
> juzhe.zh...@rivai.ai
>
> From: Richard Biener
> Date: 2023-10-12 17:44
> To: ???
> 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.zh...@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 <gcall *> (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 <rguent...@suse.de>
SUSE Software Solutions Germany GmbH,
Frankenstrasse 146, 90461 Nuernberg, Germany;
GF: Ivo Totev, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)
