[committed] Add a testcase for PR tree-optimization/51117

[Jakub Jelinek]

Hi!

I've committed a testcase that I wrote in the PR51117 clobber
sinking thread, after regtesting on x86_64-linux and i686-linux.

2011-12-15  Jakub Jelinek  <ja...@redhat.com>

        PR tree-optimization/51117
        * g++.dg/opt/pr51117.C: New test.

--- gcc/testsuite/g++.dg/opt/pr51117.C.jj       2011-12-15 12:19:29.278552435 
+0100
+++ gcc/testsuite/g++.dg/opt/pr51117.C  2011-12-15 12:19:02.569708102 +0100
@@ -0,0 +1,37 @@
+// PR tree-optimization/51117
+// { dg-do compile }
+// { dg-options "-O2 -fexceptions" }
+
+struct A { char buf[64]; };
+void bar (A *);
+
+int
+foo ()
+{
+  A c;
+  bar (&c);
+  try
+  {
+    {
+      A a;
+      bar (&a);
+      if (a.buf[13])
+        throw 1;
+      else if (a.buf[52])
+        throw 3;
+    }
+    {
+      A b;
+      bar (&b);
+      if (b.buf[13])
+        throw 2;
+    }
+  }
+  catch ( ...)
+  {
+    return 1;
+  }
+  return 0;
+}
+
+// { dg-final { scan-assembler-not "__cxa_rethrow" } }

        Jakub