1 files changed, 62 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/vect/wrapv-vect-reduc-dot-s8b.c b/gcc/testsuite/gcc.dg/vect/wrapv-vect-reduc-dot-s8b.c
new file mode 100644
index 00000000000..724bb58b767
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/wrapv-vect-reduc-dot-s8b.c
@@ -0,0 +1,62 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+#define N 64
+
+#define DOT -21856
+
+signed char X[N] __attribute__ ((__aligned__(16)));
+signed char Y[N] __attribute__ ((__aligned__(16)));
+
+/* char->short->short dot product.
+   The dot-product pattern should be detected.
+   Should be vectorized on vect_sdot_qi targets (targets that support 
+   dot-product of signed char).  
+   This test currently fails to vectorize on targets that support
+   dot-product of chars into and int accumulator.
+   Can also be vectorized as widening-mult + summation,
+   or with type-conversion support.
+ */
+short
+foo(int len) {
+  int i;
+  short result = 0;
+
+  for (i=0; i<len; i++) {
+    result += (X[i] * Y[i]);
+  }
+  return result;
+}
+
+int main (void)
+{
+  int i;
+  short dot;
+
+  check_vect ();
+
+  for (i=0; i<N; i++) {
+    X[i] = i;
+    Y[i] = 64-i;
+  }
+
+  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 "vect_recog_widen_mult_pattern: detected" 1 "vect" } } */
+
+/* When vectorizer is enhanced to vectorize accumulation into short for targets 
+   that support accumulation into int (e.g. ia64) we'd have:
+dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_sdot_qi } }
+*/
+/* In the meantime expect: */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_widen_mult_qi_to_hi } } } */
+
+/* { dg-final { cleanup-tree-dump "vect" } } */