diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0e8b23288a0..d9c45c9e794 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2018-02-08  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	PR tree-optimization/84265
+	* tree-vect-stmts.c (vectorizable_store): Don't treat
+	VMAT_CONTIGUOUS accesses as grouped.
+	(vectorizable_load): Likewise.
+
 2018-02-08  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	PR tree-optimization/81635
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 52cf0b53870..e989c94a5e4 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-02-08  Richard Sandiford  <richard.sandiford@linaro.org>
+
+	PR tree-optimization/84265
+	* gcc.dg/vect/pr84265.c: New test.
+
 2018-02-08  Richard Sandiford  <richard.sandiford@linaro.org>
 
 	PR tree-optimization/81635
diff --git a/gcc/testsuite/gcc.dg/vect/pr84265.c b/gcc/testsuite/gcc.dg/vect/pr84265.c
new file mode 100644
index 00000000000..59984aead05
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr84265.c
@@ -0,0 +1,23 @@
+/* { dg-do compile } */
+
+struct a
+{
+  unsigned long b;
+  unsigned long c;
+  int d;
+  int *e;
+  char f;
+};
+
+struct
+{
+  int g;
+  struct a h[];
+} i;
+
+int j, k;
+void l ()
+{
+  for (; k; k++)
+    j += (int) (i.h[k].c - i.h[k].b);
+}
diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index c5085ca9c0a..6066a52c23e 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -6214,7 +6214,8 @@ vectorizable_store (gimple *stmt, gimple_stmt_iterator *gsi, gimple **vec_stmt,
     }
 
   grouped_store = (STMT_VINFO_GROUPED_ACCESS (stmt_info)
-		   && memory_access_type != VMAT_GATHER_SCATTER);
+		   && memory_access_type != VMAT_GATHER_SCATTER
+		   && (slp || memory_access_type != VMAT_CONTIGUOUS));
   if (grouped_store)
     {
       first_stmt = GROUP_FIRST_ELEMENT (stmt_info);
@@ -7708,7 +7709,8 @@ vectorizable_load (gimple *stmt, gimple_stmt_iterator *gsi, gimple **vec_stmt,
       return true;
     }
 
-  if (memory_access_type == VMAT_GATHER_SCATTER)
+  if (memory_access_type == VMAT_GATHER_SCATTER
+      || (!slp && memory_access_type == VMAT_CONTIGUOUS))
     grouped_load = false;
 
   if (grouped_load)