Add test-cases mentioned in r236502.

From-SVN: r236503

gcc/testsuite/gcc.dg/vect/section-anchors-vect-70.c

+/* { dg-do compile } */
+/* { dg-require-effective-target section_anchors } */
+/* { dg-require-effective-target vect_int } */
+
+#define N 32
+
+/* Increase alignment of struct if an array's offset is multiple of alignment of
+   vector type corresponding to it's scalar type.
+   For the below test-case:
+   offsetof(e) == 8 bytes. 
+   i) For arm: let x = alignment of vector type corresponding to int,
+   x == 8 bytes.
+   Since offsetof(e) % x == 0, set DECL_ALIGN(a, b, c) to x.
+   ii) For aarch64, ppc: x == 16 bytes.
+   Since offsetof(e) % x != 0, don't increase alignment of a, b, c.
+*/
+
+static struct A {
+  int p1, p2;
+  int e[N];
+} a, b, c;
+
+int foo(void)
+{
+  for (int i = 0; i < N; i++)
+    a.e[i] = b.e[i] + c.e[i];
+
+   return a.e[0];
+}
+
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 0 "increase_alignment" { target aarch64*-*-* } } } */
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 0 "increase_alignment" { target powerpc64*-*-* } } } */
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 3 "increase_alignment" { target arm*-*-* } } } */

gcc/testsuite/gcc.dg/vect/section-anchors-vect-71.c

+/* { dg-do compile } */
+/* { dg-require-effective-target section_anchors } */
+/* { dg-require-effective-target vect_int } */
+
+/* Should not increase alignment of the struct because
+   sizeof (A.e) < sizeof(corresponding vector type).  */
+
+#define N 3
+
+static struct A {
+  int p1, p2;
+  int e[N];
+} a, b, c;
+
+int foo(void)
+{
+  for (int i = 0; i < N; i++)
+    a.e[i] = b.e[i] + c.e[i];
+
+   return a.e[0];
+}
+
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 0 "increase_alignment" { target aarch64*-*-* } } } */
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 0 "increase_alignment" { target powerpc64*-*-* } } } */
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 0 "increase_alignment" { target arm*-*-* } } } */

gcc/testsuite/gcc.dg/vect/section-anchors-vect-72.c

+/* { dg-do compile } */
+/* { dg-require-effective-target section_anchors } */
+/* { dg-require-effective-target vect_int } */
+
+#define N 32
+
+/* Clone of section-anchors-vect-70.c having nested struct.  */
+
+struct S
+{
+  int e[N];
+};
+
+static struct A {
+  int p1, p2;
+  struct S s; 
+} a, b, c;
+
+int foo(void)
+{
+  for (int i = 0; i < N; i++)
+    a.s.e[i] = b.s.e[i] + c.s.e[i];
+
+   return a.s.e[0];
+}
+
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 0 "increase_alignment" { target aarch64*-*-* } } } */
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 0 "increase_alignment" { target powerpc64*-*-* } } } */
+/* { dg-final { scan-ipa-dump-times "Increasing alignment of decl" 3 "increase_alignment" { target arm*-*-* } } } */