1 files changed, 56 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s16a.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s16a.c
new file mode 100644
index 000000000..c98634416
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s16a.c
@@ -0,0 +1,56 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+#define N 64
+#define DOT 43680
+
+signed short X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
+signed short Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
+
+/* short->int->int dot product.
+   Detected as a dot-product pattern.
+   Vectorized on targets that support dot-product for signed shorts.  */
+
+__attribute__ ((noinline)) int
+foo (int len)
+{
+  int i;
+  int result = 0;
+
+  for (i = 0; i < len; i++)
+    {
+      result += (X[i] * Y[i]);
+    }
+  return result;
+}
+
+
+int
+main (void)
+{
+  int i;
+  int dot;
+
+  check_vect ();
+
+  for (i = 0; i < N; i++)
+    {
+      X[i] = i;
+      Y[i] = N - i;
+      __asm__ volatile ("");
+    }
+
+  dot = foo (N);
+  if (dot != DOT)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" } } */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_sdot_hi } } } */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_widen_mult_hi_to_si } } } */
+/* { dg-final { cleanup-tree-dump "vect" } } */
+