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tree-optimization/98180 - fix BIT_INSERT_EXPR sequence vectorization

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This adds a missing check for the first inserted value.

2020-12-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/98180
	* tree-vect-slp.c (vect_slp_check_for_constructors): Check the
	first inserted value has a def.
This commit is contained in:
Richard Biener
2020-12-08 09:42:35 +01:00
parent c1370f8c0d
commit e844c04e35
1 changed files with 3 additions and 1 deletions
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gcc/tree-vect-slp.c
+3 -1
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@@ -4193,10 +4193,12 @@ vect_slp_check_for_constructors (bb_vec_info bb_vinfo)
else if (gimple_assign_rhs_code (assign) == BIT_INSERT_EXPR
&& VECTOR_TYPE_P (TREE_TYPE (rhs))
&& TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)).is_constant ()
&& TYPE_VECTOR_SUBPARTS (TREE_TYPE (rhs)).to_constant () > 1
&& integer_zerop (gimple_assign_rhs3 (assign))
&& useless_type_conversion_p
(TREE_TYPE (TREE_TYPE (rhs)),
TREE_TYPE (gimple_assign_rhs2 (assign))))
TREE_TYPE (gimple_assign_rhs2 (assign)))
&& bb_vinfo->lookup_def (gimple_assign_rhs2 (assign)))
{
/* We start to match on insert to lane zero but since the
inserts need not be ordered we'd have to search both