1 files changed, 101 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8.c
new file mode 100644
index 0000000..ad68bc7
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8.c
@@ -0,0 +1,101 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+#define N 64
+
+#define DOT1 43680
+#define DOT2 43680
+#define DOT3 43680
+
+unsigned char X[N] __attribute__ ((__aligned__(16)));
+unsigned char Y[N] __attribute__ ((__aligned__(16)));
+
+/* char->short->int dot product. 
+   Detected as a dot-product pattern.
+   Should be vectorized on targets that support dot-product for unsigned chars.
+   */
+unsigned int
+foo1(int len) {
+  int i;
+  unsigned int result = 0;
+  unsigned short prod;
+
+  for (i=0; i<len; i++) {
+    prod = X[i] * Y[i];
+    result += prod;
+  }
+  return result;
+}
+
+/* char->short->short dot product. 
+   Detected as a dot-product pattern.
+   Should be vectorized on targets that support dot-product for unsigned chars.
+   This test currently fails to vectorize on targets that support dot-product 
+   of chars only when the accumulator is int.
+   */
+unsigned short
+foo2(int len) {
+  int i;
+  unsigned short result = 0;
+
+  for (i=0; i<len; i++) {
+    result += (unsigned short)(X[i] * Y[i]);
+  }
+  return result;
+}
+
+/* char->int->int dot product. 
+   Not detected as a dot-product.
+   Doesn't get vectorized due to presence of type converisons.  */
+unsigned int
+foo3(int len) {
+  int i;
+  unsigned int result = 0;
+
+  for (i=0; i<len; i++) {
+    result += (X[i] * Y[i]);
+  }
+  return result;
+}
+
+int main (void)
+{
+  unsigned int dot1, dot3;
+  unsigned short dot2;
+  int i;
+
+  check_vect ();
+
+  for (i=0; i<N; i++) {
+    X[i] = i;
+    Y[i] = 64-i;
+  }
+
+  dot1 = foo1 (N);
+  if (dot1 != DOT1)
+    abort ();
+
+  dot2 = foo2 (N);
+  if (dot2 != DOT2)
+    abort ();
+
+  dot3 = foo3 (N);
+  if (dot3 != DOT3)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 2 "vect" } } */
+
+/* When the vectorizer is enhanced to vectorize foo2 (accumulation into short) for 
+   targets that support accumulation into int (powerpc, ia64) we'd have:
+dg-final { scan-tree-dump-times "vectorized 1 loops" 2 "vect" { target vect_udot_qi } }
+*/
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 2 "vect" { xfail *-*-* } } } */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_udot_qi } } } */
+
+/* { dg-final { cleanup-tree-dump "vect" } } */
+