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Do not bother with reassociation in SLP discovery for single-lane

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It just clutters the dump files and takes up compile-time.

	* tree-vect-slp.cc (vect_build_slp_tree_2): Disable SLP
	reassociation for single-lane.
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Richard Biener 2024-08-30 11:39:53 +02:00 • committed by Richard Biener
parent b748e2eed0
commit e7c7397236
1 changed files with 2 additions and 0 deletions
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gcc/tree-vect-slp.cc
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@ -2082,6 +2082,8 @@ vect_build_slp_tree_2 (vec_info *vinfo, slp_tree node,
for matching as we can succeed by means of builds from scalars
and have no good way to "cost" one build against another. */
else if (is_a <loop_vec_info> (vinfo)
/* Do not bother for single-lane SLP. */
&& group_size > 1
/* ??? We don't handle !vect_internal_def defs below. */
&& STMT_VINFO_DEF_TYPE (stmt_info) == vect_internal_def
/* ??? Do not associate a reduction, this will wreck REDUC_IDX