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
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files in the upstream repository.

1 files changed, 55 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8b.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8b.c
new file mode 100644
index 000000000..01c82b52c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u8b.c
@@ -0,0 +1,55 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+#define N 64
+
+#define DOT 43680
+
+unsigned char X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__))) = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63};
+unsigned char Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__))) = {64,63,62,61,60,59,58,57,56,55,54,53,52,51,50,49,48,47,46,45,44,43,42,41,40,39,38,37,36,35,34,33,32,31,30,29,28,27,26,25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1};
+
+/* char->short->short dot product. 
+   Detected as a dot-product pattern.
+   Should be vectorized on targets that support dot-product for unsigned chars,
+   but currently this test cannot be vectorized as a dot-product on targets
+   that support char->short->int dot-product. 
+   Alternatively, this test can be vectorized using vect_widen_mult_qi (or
+   vect_unpack and non-widening multplication: vect_unpack && vect_short_mult).
+   */
+__attribute__ ((noinline)) unsigned short
+foo (int len) {
+  int i;
+  unsigned short result = 0;
+
+  for (i=0; i<len; i++) {
+    result += (unsigned short)(X[i] * Y[i]);
+  }
+  return result;
+}
+
+int main (void)
+{
+  unsigned short dot;
+  int i;
+
+  check_vect ();
+
+  dot = foo (N);
+  if (dot != DOT)
+    abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" } } */
+
+/* When the vectorizer is enhanced to vectorize accumulation into short for 
+   targets that support accumulation into int (powerpc, ia64) we'd have:
+dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_udot_qi || vect_widen_mult_qi_to_hi } }
+*/
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" {target { vect_widen_mult_qi_to_hi || vect_unpack } } } } */
+
+/* { dg-final { cleanup-tree-dump "vect" } } */
+