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[Bug tree-optimization/66510] [6 Regression] gcc.target/arm/pr53636.c FAILs after r224221
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 16 Jun 2015 14:55:30 +0000
- Subject: [Bug tree-optimization/66510] [6 Regression] gcc.target/arm/pr53636.c FAILs after r224221
- Auto-submitted: auto-generated
- References: <bug-66510-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66510
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ok, so we don't limit group sizes to multiples of nunits which means
vect_transform_slp_perm_load misses an early out. This is then also a missed
optimization as we don't consider the three SLP loads permutes of the single
group load.
Index: gcc/tree-vect-slp.c
===================================================================
--- gcc/tree-vect-slp.c (revision 224514)
+++ gcc/tree-vect-slp.c (working copy)
@@ -3306,6 +3276,10 @@ vect_transform_slp_perm_load (slp_tree n
return false;
}
+ if (need_next_vector
+ && vec_index >= (vf * group_size) / nunits)
+ return false;
+
if (!analyze_only)
{
int l;