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tree-optimization/97098 - fix compile-time hog in SLP live

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This fixes a missed early-out in SLP live stmt marking when
all scalar stmts were already visited (oops).

2020-09-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/97098
	* tree-vect-slp.c (vect_bb_slp_mark_live_stmts): Do not
	recurse to children when all stmts were already visited.
This commit is contained in:
Richard Biener 2020-09-18 09:00:12 +02:00
parent f627125855
commit 080ddd8a81
1 changed files with 4 additions and 0 deletions
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4
gcc/tree-vect-slp.c
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@ -3018,11 +3018,13 @@ vect_bb_slp_mark_live_stmts (bb_vec_info bb_vinfo, slp_tree node,
unsigned i;
stmt_vec_info stmt_info;
stmt_vec_info last_stmt = vect_find_last_scalar_stmt_in_slp (node);
bool all_visited = true;
FOR_EACH_VEC_ELT (SLP_TREE_SCALAR_STMTS (node), i, stmt_info)
{
stmt_vec_info orig_stmt_info = vect_orig_stmt (stmt_info);
if (svisited.contains (orig_stmt_info))
continue;
all_visited = false;
bool mark_visited = true;
gimple *orig_stmt = orig_stmt_info->stmt;
ssa_op_iter op_iter;
@ -3091,6 +3093,8 @@ vect_bb_slp_mark_live_stmts (bb_vec_info bb_vinfo, slp_tree node,
if (mark_visited)
svisited.add (orig_stmt_info);
}
if (all_visited)
return;
slp_tree child;
FOR_EACH_VEC_ELT (SLP_TREE_CHILDREN (node), i, child)