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* [gcc r9-9815] vect: Don't update inits for simd_lane_access DRs [PR102789]
@ 2021-11-08 5:31 Kewen Lin
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From: Kewen Lin @ 2021-11-08 5:31 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:6cce26752d8431a1ef6d3f9a97fa0ee2e9f96816
commit r9-9815-g6cce26752d8431a1ef6d3f9a97fa0ee2e9f96816
Author: Kewen Lin <linkw@linux.ibm.com>
Date: Mon Oct 25 21:05:02 2021 -0500
vect: Don't update inits for simd_lane_access DRs [PR102789]
As PR102789 shows, when vectorizer does some peelings for alignment
in prologues, function vect_update_inits_of_drs would update the
inits of some drs. But as the failed case, we shouldn't update the
dr for simd_lane_access, it has the fixed-length storage mainly for
the main loop, the update can make the access out of bound and access
the unexpected element.
gcc/ChangeLog:
PR tree-optimization/102789
* tree-vect-loop-manip.c (vect_update_inits_of_drs): Do not
update inits of simd_lane_access.
(cherry picked from commit f3dbd3f36d55178d0a9e4431043cbc950524969a)
Diff:
---
gcc/tree-vect-loop-manip.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gcc/tree-vect-loop-manip.c b/gcc/tree-vect-loop-manip.c
index 030effcd79d..4951e1d505f 100644
--- a/gcc/tree-vect-loop-manip.c
+++ b/gcc/tree-vect-loop-manip.c
@@ -1774,7 +1774,8 @@ vect_update_inits_of_drs (loop_vec_info loop_vinfo, tree niters,
FOR_EACH_VEC_ELT (datarefs, i, dr)
{
dr_vec_info *dr_info = loop_vinfo->lookup_dr (dr);
- if (!STMT_VINFO_GATHER_SCATTER_P (dr_info->stmt))
+ if (!STMT_VINFO_GATHER_SCATTER_P (dr_info->stmt)
+ && !STMT_VINFO_SIMD_LANE_ACCESS_P (dr_info->stmt))
vect_update_init_of_dr (dr, niters, code);
}
}
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