obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 59 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u16b.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u16b.c
new file mode 100644
index 000000000..42b104fb8
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u16b.c
@@ -0,0 +1,59 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+#define N 64
+
+#define DOT2 43680
+
+unsigned short X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
+unsigned short Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
+
+/* short->int->int dot product. 
+   Currently not detected as a dot-product pattern: the multiplication 
+   promotes the ushorts to int, and then the product is promoted to unsigned 
+   int for the addition.  Which results in an int->unsigned int cast, which 
+   since no bits are modified in the cast should be trivially vectorizable.  */
+__attribute__ ((noinline)) unsigned int
+foo2(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  dot2;
+  int i;
+
+  check_vect ();
+
+  for (i=0; i<N; i++) {
+    X[i] = i;
+    Y[i] = 64-i;
+    __asm__ volatile ("");
+  }
+
+  dot2 = foo2 (N);
+  if (dot2 != DOT2)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" { xfail *-*-* } } } */
+
+/* Once the dot-product pattern is detected, we expect
+   that loop to be vectorized on vect_udot_hi targets (targets that support 
+   dot-product of unsigned shorts) and targets that support widening multiplication.  */
+/* The induction loop in main is vectorized.  */
+/* { 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_pack_trunc } } } */ 
+
+/* { dg-final { cleanup-tree-dump "vect" } } */