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, 46 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-4.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-4.c
new file mode 100644
index 000000000..a6c8c8fd3
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-4.c
@@ -0,0 +1,46 @@
+/* A test for strength reduction and induction variable elimination.  */
+
+/* { dg-do compile } */
+/* { dg-options "-O1 -fdump-tree-optimized" } */
+/* { dg-require-effective-target size32plus } */
+
+/* Size of this structure should be sufficiently weird so that no memory
+   addressing mode applies.  */
+
+struct bla
+{
+  char x[187];
+  int y;
+  char z[253];
+} arr_base[100];
+
+int foo(void);
+
+void xxx(void)
+{
+  int iter;
+
+  for (iter = 0; iter < 100; iter++)
+    arr_base[iter].y = foo ();
+}
+
+/* Access to arr_base[iter].y should be strength reduced.  Depending on
+   whether we have an addressing mode of type [base + offset], one of the
+   following forms might get chosen:
+
+   -- induction variable with base &arr_base[0].y, the memory access of
+      form *iv = ...
+   -- induction variable with base 0, the memory access of form
+      *(iv + &arr_base[0].y) = ...
+
+   In any case, we should not have any multiplication.  */
+
+/* { dg-final { scan-tree-dump-times " \\* \[^\\n\\r\]*=" 0 "optimized" } } */
+/* { dg-final { scan-tree-dump-times "\[^\\n\\r\]*= \\* " 0 "optimized" } } */
+/* { dg-final { scan-tree-dump-times "MEM" 1 "optimized" } } */
+
+/* And the original induction variable should be eliminated.  */
+
+/* { dg-final { scan-tree-dump-times "iter" 0 "optimized" } } */
+
+/* { dg-final { cleanup-tree-dump "optimized" } } */