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tree-optimization/97615 - avoid creating externals from patterns

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The previous change missed to check for patterns again, the following
corrects that.

2020-10-28  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/97615
	* tree-vect-slp.c (vect_build_slp_tree_2): Do not build
	an external from pattern defs.

	* gcc.dg/vect/bb-slp-pr97615.c: New testcase.
This commit is contained in:
Richard Biener 2020-10-28 13:21:53 +01:00
parent 616351b897
commit b626b00823
2 changed files with 25 additions and 1 deletions
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23
gcc/testsuite/gcc.dg/vect/bb-slp-pr97615.c Normal file
View File

@ -0,0 +1,23 @@
/* { dg-do compile } */
short *a;
int e, f;
void
foo (int c, int d)
{
short *a1, *a2, *a3;
a1 = a++;
*a1 = c;
a2 = a++;
*a2 = *a1;
a3 = a++;
*a3 = d;
}
void
bar (void)
{
foo (e + f - 2, e + f - 1);
foo (e + f - 1, 0);
}

3
gcc/tree-vect-slp.c
View File

@ -1599,7 +1599,8 @@ vect_build_slp_tree_2 (vec_info *vinfo, slp_tree node,
}
if (is_a <bb_vec_info> (vinfo)
&& oprnd_info->first_dt == vect_internal_def)
&& oprnd_info->first_dt == vect_internal_def
&& !oprnd_info->any_pattern)
{
/* For BB vectorization, if all defs are the same do not
bother to continue the build along the single-lane