--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/torture/pr93868.c	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,31 @@
+/* { dg-do run } */
+/* { dg-additional-options "-ftree-vectorize" } */
+
+unsigned a[1024];
+unsigned b[1024];
+
+void __attribute__((noipa))
+foo (unsigned *q, unsigned *r)
+{
+  unsigned sum1 = 0, sum2 = 0;
+  for (int i = 0; i < 512; ++i)
+    {
+      sum1 += a[2*i];
+      sum2 += a[2*i+1];
+      b[2*i] = a[2*i+1];
+      b[2*i+1] = a[2*i];
+    }
+  *q = sum1;
+  *r = sum2;
+}
+
+int main()
+{
+  unsigned sum1, sum2;
+  a[0] = 0;
+  a[1] = 1;
+  foo (&sum1, &sum2);
+  if (b[0] != 1 || b[1] != 0)
+    __builtin_abort ();
+  return 0;
+}