From 931832a5ccd92c7289f4933c42cf007e1a6b737f Mon Sep 17 00:00:00 2001 From: Richard Biener Date: Mon, 7 Sep 2020 14:26:46 +0200 Subject: [PATCH] improve SLP vect dumping 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 * 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. --- gcc/tree-vect-slp.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c index c89ed04f479..dcc80d55917 100644 --- a/gcc/tree-vect-slp.c +++ b/gcc/tree-vect-slp.c @@ -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); -- 2.30.2