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improve SLP vect dumping

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This adds additional dumping helping in particular basic-block
vectorization SLP dump reading plus showing what we actually
generate code from.

2020-09-07  Richard Biener  <rguenther@suse.de>

	* tree-vect-slp.c (vect_analyze_slp_instance): Dump
	stmts we start SLP analysis from, failure and splitting.
	(vect_schedule_slp): Dump SLP graph entry and root stmt
	we are about to emit code for.
This commit is contained in:
Richard Biener 2020-09-07 14:26:46 +02:00
parent 3fe3efe5c1
commit 931832a5cc
1 changed files with 29 additions and 0 deletions
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29
gcc/tree-vect-slp.c
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@ -2202,6 +2202,15 @@ vect_analyze_slp_instance (vec_info *vinfo,
scalar_stmts.safe_push (next_info);
}
if (dump_enabled_p ())
{
dump_printf_loc (MSG_NOTE, vect_location,
"Starting SLP discovery for\n");
for (i = 0; i < scalar_stmts.length (); ++i)
dump_printf_loc (MSG_NOTE, vect_location,
" %G", scalar_stmts[i]->stmt);
}
/* Build the tree for the SLP instance. */
bool *matches = XALLOCAVEC (bool, group_size);
unsigned npermutes = 0;
@ -2232,6 +2241,10 @@ vect_analyze_slp_instance (vec_info *vinfo,
return false;
}
/* Fatal mismatch. */
if (dump_enabled_p ())
dump_printf_loc (MSG_NOTE, vect_location,
"SLP discovery succeeded but node needs "
"splitting\n");
matches[0] = true;
matches[group_size / const_max_nunits * const_max_nunits] = false;
vect_free_slp_tree (node, false);
@ -2374,6 +2387,9 @@ vect_analyze_slp_instance (vec_info *vinfo,
gcc_assert ((const_nunits & (const_nunits - 1)) == 0);
unsigned group1_size = i & ~(const_nunits - 1);
if (dump_enabled_p ())
dump_printf_loc (MSG_NOTE, vect_location,
"Splitting SLP group at stmt %u\n", i);
stmt_vec_info rest = vect_split_slp_store_group (stmt_info,
group1_size);
bool res = vect_analyze_slp_instance (vinfo, bst_map, stmt_info,
@ -2395,6 +2411,9 @@ vect_analyze_slp_instance (vec_info *vinfo,
(some) of the remainder. FORNOW ignore this possibility. */
}
/* Failed to SLP. */
if (dump_enabled_p ())
dump_printf_loc (MSG_NOTE, vect_location, "SLP discovery failed\n");
return false;
}
@ -4662,6 +4681,16 @@ vect_schedule_slp (vec_info *vinfo)
FOR_EACH_VEC_ELT (slp_instances, i, instance)
{
slp_tree node = SLP_INSTANCE_TREE (instance);
if (dump_enabled_p ())
{
dump_printf_loc (MSG_NOTE, vect_location,
"Vectorizing SLP tree:\n");
if (SLP_INSTANCE_ROOT_STMT (instance))
dump_printf_loc (MSG_NOTE, vect_location, "Root stmt: %G",
SLP_INSTANCE_ROOT_STMT (instance)->stmt);
vect_print_slp_graph (MSG_NOTE, vect_location,
SLP_INSTANCE_TREE (instance));
}
/* Schedule the tree of INSTANCE. */
vect_schedule_slp_instance (vinfo, node, instance);