1 files changed, 135 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/opt/stack1.C b/gcc/testsuite/g++.dg/opt/stack1.C
new file mode 100644
index 00000000000..bb6159c568e
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+++ b/gcc/testsuite/g++.dg/opt/stack1.C
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+// PR optimization/11198
+// Origin: Joerg Walter <jhr.walter@t-online.de>
+// Reduced testcase by: Volker Reichelt <reichelt@igpm.rwth-aachen.de>
+//                      Wolfgang Bangerth <bangerth@ticam.utexas.edu>
+
+// The compiler used to allocate the same stack slot for two aggregates,
+// overlooking that assignments to members given the same address on the
+// stack may not alias and thus may be reordered by the scheduling passes.
+
+// { dg-do run }
+// { dg-options "-O2 -frename-registers" }
+
+
+double zero_;
+
+inline const int&
+min(const int& a, const int& b) {
+  if (b < a) return b; return a;
+}
+
+struct barrier { barrier () {} };
+
+template <typename=void> struct unbounded_array {
+    inline unbounded_array (): data_ (new double [9]) {}
+    inline double& operator [] (int i) { return data_ [i]; }
+    double* data_;
+};
+
+inline int element (int i, int j) {
+  return i + j;
+}
+
+template <typename=void>
+struct matrix {
+    inline matrix () : size2_ (3) {}
+
+    inline unbounded_array<> &data () { return data_; }
+
+    inline double& el (int i, int j) {
+      int dead1 = j;
+      int dead2 = 1 + i - j;
+      if (j < size2_ && i-j < 2)
+	return data () [element (j,i-j+1)];
+      barrier ();
+      return zero_;
+    }
+
+    struct iterator2;
+
+    inline iterator2 find () {
+      return iterator2 (*this);
+    }
+
+    struct iterator1 {
+        inline iterator1 (matrix *m):
+			dead1 (m), i (0) {}
+	void *dead1;
+        int i;
+        int dead2;
+    };
+
+    const int size2_;
+    unbounded_array<> data_;
+};
+
+
+template<typename=void>
+struct adaptor {
+    adaptor (matrix<> &m) : m(&m), upper_ (1) {}
+
+    int size1 () const     { return m->size1 (); }
+    int size2 () const     { return 3; }
+    int lower () const     { return 1; }
+    int upper () const     { return upper_; }
+    matrix<> &data () { return *m; }
+
+    double& el (int i, int j) {
+      int dead1, dead2;
+      if (j < size2 () && i-j < 1)
+	return data ().el (i, j);
+
+      barrier ();
+      return zero_;
+    }
+
+    struct a_iterator2;
+
+    struct a_iterator1 {
+        a_iterator1 (adaptor &a, const matrix<>::iterator1 &it1):
+			a (&a), dead1 (it1) {}
+
+        a_iterator2 begin () const {
+	  return a_iterator2(*a);
+        }
+	adaptor *a;	
+        matrix<>::iterator1 dead1;
+    };
+
+    struct a_iterator2 {
+        a_iterator2 (adaptor &a) : a (&a) {}
+
+        double& f () const {
+	  int i = 0;
+	  int l = a->upper () + i;
+	  int q = a->size2 ();
+	  if (0 < q &&
+	      l < a->lower () + 1 + a->upper ())
+	    return a->m->el(0,0);
+
+	  return a->el (i, 0);
+        }
+
+	adaptor *a;
+    };
+
+    matrix<> *m;
+    int upper_;
+};
+
+void matrix_swap (adaptor<> &bam1, adaptor<> &bam2)
+{
+  adaptor<>::a_iterator1 it1 (bam1,matrix<>::iterator1(bam1.m)),
+                         it2 (bam2,matrix<>::iterator1(bam2.m));
+  int dead;
+  double x = it1.begin().f();
+  it2.begin().f() = x;
+}
+
+int main ()
+{
+  matrix<> m1,m2;
+  adaptor<> bam1 (m1), bam2 (m2);
+  matrix_swap (bam1, bam2);
+  return 0;
+}