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, 27 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/20040319-1.c b/gcc/testsuite/gcc.dg/tree-ssa/20040319-1.c
new file mode 100644
index 000000000..d6e544971
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/20040319-1.c
@@ -0,0 +1,27 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+/* Test derived from PR 14643.  When a function has no addressable
+   variables but 2 or more pointers have conflicting memory tags, they
+   were not being processed by the type based alias analyzer,
+   resulting in optimizations removing a non-redundant load.  */
+
+extern void abort (void);
+
+struct bar { int count;  int *arr;};
+
+void foo (struct bar *b)
+{
+  b->count = 0;
+  *(b->arr) = 2;
+  if (b->count == 0)	/* b->count can't be assumed to be 0 here.  */
+    abort ();
+}
+
+main ()
+{
+  struct bar x;
+  x.arr = &x.count;
+  foo (&x);
+  return 0;
+}