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, 56 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/vect/pr20122.c b/gcc/testsuite/gcc.dg/vect/pr20122.c
new file mode 100644
index 000000000..9d21fc600
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/vect/pr20122.c
@@ -0,0 +1,56 @@
+/* { dg-require-effective-target vect_int } */
+
+#include <stdarg.h>
+#include "tree-vect.h"
+
+short Kernshort[24] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
+static void VecBug(short Kernel[8][24]) __attribute__((noinline));
+static void VecBug2(short Kernel[8][24]) __attribute__((noinline));
+
+/* Kernel may alias Kernshort - a global array.
+   Use versioning for aliasing.  */
+static void VecBug(short Kernel[8][24])
+{
+  int k,i;
+    for (k = 0; k<8; k++)
+        for (i = 0; i<24; i++)
+            Kernshort[i] = Kernel[k][i];
+}
+
+/* Vectorizable: Kernshort2 is local.  */
+static void VecBug2(short Kernel[8][24])
+{
+  int k,i;
+  short Kernshort2[24] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
+    for (k = 0; k<8; k++)
+        for (i = 0; i<24; i++)
+            Kernshort2[i] = Kernel[k][i];
+
+    for (k = 0; k<8; k++)
+        for (i = 0; i<24; i++)
+            if (Kernshort2[i] != Kernel[k][i])
+                abort ();
+}
+
+int main (int argc, char **argv)
+{
+    check_vect ();
+
+    short Kernel[8][24] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
+    int k,i;
+
+    for (k = 0; k<8; k++)
+        for (i = 0; i<24; i++)
+            Kernel[k][i] = 0;
+
+    VecBug(Kernel);
+    VecBug2(Kernel);
+
+    return 0;
+}
+
+/* The loops in VecBug and VecBug2 require versioning for alignment.
+   The loop in main is aligned.  */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 3 "vect" } } */
+/*  { dg-final { scan-tree-dump-times "Alignment of access forced using versioning" 2 "vect" { target vect_no_align } } } */
+/* { dg-final { cleanup-tree-dump "vect" } } */