1 files changed, 50 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/torture/pr45720.c b/gcc/testsuite/gcc.dg/torture/pr45720.c
new file mode 100644
index 000000000..9de8d1117
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr45720.c
@@ -0,0 +1,50 @@
+/* { dg-do run } */
+/* { dg-options "-ftree-vectorize" } */
+
+float val[256];
+float x;
+void __attribute__((noinline,noclone))
+foo(int len, int beg)
+{
+  int i;
+  for (i = len - 1; i >= beg; --i)
+    x += val[i] * 2;
+}
+void __attribute__((noinline,noclone))
+bar(void)
+{
+  int i;
+  for (i = 255; i >= 0; --i)
+    x += val[i] * 2;
+  for (i = 254; i >= 0; --i)
+    x += val[i] * 2;
+  for (i = 253; i >= 0; --i)
+    x += val[i] * 2;
+  for (i = 252; i >= 0; --i)
+    x += val[i] * 2;
+}
+float y[256];
+void __attribute__((noinline,noclone))
+foobar(void)
+{
+  int i;
+  for (i = 0; i < 252; ++i)
+    {
+      float l = 0;
+      l += val[255 - i] * 2;
+      l += val[254 - i] * 2;
+      l += val[253 - i] * 2;
+      l += val[252 - i] * 2;
+      y[i] = l;
+    }
+}
+int main()
+{
+  foo(256-1, 0);
+  foo(256-2, 0);
+  foo(256-3, 0);
+  foo(256-4, 0);
+  bar();
+  foobar();
+  return 0;
+}