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, 47 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c b/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c
new file mode 100644
index 000000000..a65d8a16d
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/vrp14.c
@@ -0,0 +1,47 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+/* { dg-require-effective-target int32plus } */
+
+struct tree_decl
+{
+  union tree_decl_u1 {
+    int f;
+    long i;
+    struct tree_decl_u1_a {
+      unsigned int align : 24;
+      unsigned int off_align : 8;
+    } a;
+  } u1;
+};
+
+extern void abort (void);
+
+unsigned int
+assemble_variable (struct tree_decl decl)
+{
+  unsigned int align;
+
+  align = decl.u1.a.align;
+
+  if (align > (1 << ((8 * 4) < 64 ? (8 * 4) - 2 : 62)))
+    align = (1 << ((8 * 4) < 64 ? (8 * 4) - 2 : 62));
+
+  /* VRP should not be propagating 0 to the RHS of this assignment.
+     But it was erroneously applying a cast operation between types of
+     different precision.  align is an unsigned int with range [0,
+     0x4000000] but the .align field holds only 24 bits.  So the cast
+     was returning a [0, 0] range.  */
+  decl.u1.a.align = align;
+
+  return decl.u1.a.align;
+}
+
+main ()
+{
+  struct tree_decl decl;
+  decl.u1.a.align = 13;
+  unsigned int x = assemble_variable (decl);
+  if (x == 0)
+    abort ();
+  return 0;
+}