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, 25 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-8.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-8.c
new file mode 100644
index 000000000..de439c719
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-8.c
@@ -0,0 +1,25 @@
+/* A test for strength reduction of ivs with nonconstant step.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-optimized" } */
+
+int bar (void);
+
+int a[100];
+
+void xxx (void)
+{
+  int iter, step = bar ();
+
+  for (iter = 0; iter < 10; iter++)
+    a[iter * step] = bar ();
+}
+
+/* The array access should be strength reduced.  But to determine the value of
+   the step, we need to calculate step * sizeof (int), thus we need to be
+   a bit careful about which multiplications we disallow.  */
+
+/* { dg-final { scan-tree-dump-times "step \\* \[^0-9\]" 0 "optimized" } } */
+/* { dg-final { scan-tree-dump-times "\[^0-9\] \\* step" 0 "optimized" } } */
+
+/* { dg-final { cleanup-tree-dump "optimized" } } */