1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/vect/vect-pre-interact.c b/gcc/testsuite/gcc.dg/vect/vect-pre-interact.c
new file mode 100644
index 000000000..096839f9c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-pre-interact.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target vect_float } */
+
+/* This checks that PRE doesn't create situations that prevent vectorization.
+   I.e. PR39300, PR35229.  */
+float res[1024], data[1025];
+
+void foo (void)
+{
+  int i;
+  for (i = 0; i < 1024; ++i)
+    res[i] = data[i] + data[i + 1];
+}
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { xfail vect_no_align } } } */
+/* { dg-final { cleanup-tree-dump "vect" } } */