[PATCH] vect: Give up if there is no offset_vectype.

[Robin Dapp]

Hi,

vect_gather_scatter_fn_p currently ICEs if offset_vectype is NULL.  This is an 
oversight in the patches that relax the gather/scatter detection.  Catch this.

Bootstrapped and regtested on x86 and power10.  Regtested on aarch64 and 
riscv64.

Regards
 Robin

gcc/ChangeLog:

        * tree-vect-data-refs.cc (vect_gather_scatter_fn_p): Bail if
        offset_vectype is NULL.
---
 gcc/tree-vect-data-refs.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gcc/tree-vect-data-refs.cc b/gcc/tree-vect-data-refs.cc
index 9c87cc1de6d..b880a6f0566 100644
--- a/gcc/tree-vect-data-refs.cc
+++ b/gcc/tree-vect-data-refs.cc
@@ -4631,6 +4631,10 @@ vect_gather_scatter_fn_p (vec_info *vinfo, bool read_p, 
bool masked_p,
   tree offset_vectype = VECTOR_TYPE_P (offset_type)
     ? offset_type : get_vectype_for_scalar_type (vinfo, offset_type);
 
+  /* If there is no related vectype, bail.  */
+  if (!offset_vectype)
+    return false;
+
   offset_type = TREE_TYPE (offset_vectype);
 
   /* Get all supported configurations for this data vector type.  */
-- 
2.51.0