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diff --git a/gcc/testsuite/g++.dg/opt/unroll1.C b/gcc/testsuite/g++.dg/opt/unroll1.C
new file mode 100644
index 00000000000..fd07f889a1d
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+++ b/gcc/testsuite/g++.dg/opt/unroll1.C
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+// PR optimization/12340
+// Origin: Richard Guenther <richard.guenther@uni-tuebingen.de>
+// Testcase by Eric Botcazou <ebotcazou@libertysurf.fr>
+
+// This used to segfault on x86 because the loop optimizer wrongly
+// interpreted a double assignment to a biv as a double increment,
+// which subsequently fooled the unroller.
+
+// { dg-do run }
+// { dg-options "-O2 -fno-exceptions -funroll-loops" }
+
+typedef __SIZE_TYPE__ size_t;
+
+inline void* operator new(size_t, void* __p) throw() { return __p; }
+inline void operator delete (void*, void*) throw() { };
+
+class Loc;
+class Interval;
+
+template<class DT>
+class DomainBase
+{
+public:
+  typedef typename DT::Domain_t Domain_t;
+  typedef typename DT::Storage_t Storage_t;
+
+  Domain_t &unwrap() { return *static_cast<Domain_t *>(this); }
+
+  const Domain_t &unwrap() const {
+    return *static_cast<Domain_t *>(const_cast<DomainBase<DT> *>(this));
+  }
+
+protected:
+  Storage_t domain_m;
+};
+
+template<class DT>
+class Domain : public DomainBase<DT>
+{
+  typedef DomainBase<DT> Base_t;
+
+public:
+  typedef typename DT::Size_t Size_t;
+  typedef typename DT::Element_t Element_t;
+  typedef typename Base_t::Domain_t Domain_t;
+  typedef typename Base_t::Storage_t Storage_t;
+
+  Domain_t &operator[](int) { return this->unwrap(); }
+
+  const Domain_t &operator[](int) const { return this->unwrap(); }
+
+  template<class T>
+  void setDomain(const T &newdom) {
+    DT::setDomain(this->domain_m, newdom);
+  }
+
+  Element_t first() const { return DT::first(this->domain_m); }
+
+  Size_t length() const { return DT::length(this->domain_m); }
+
+  Size_t size() const { return length(); }
+};
+
+template<class T>
+struct DomainTraits;
+
+template<>
+struct DomainTraits<Interval>
+{
+  typedef int Size_t;
+  typedef int Element_t;
+  typedef Interval Domain_t;
+  typedef Interval OneDomain_t;
+  typedef Loc AskDomain_t;
+  typedef int Storage_t[2];
+  enum { dimensions = 1 };
+  enum { wildcard = false };
+
+  static int first(const Storage_t &d) { return d[0]; }
+
+  static int length(const Storage_t &d) { return d[1]; }
+
+  static OneDomain_t &getDomain(Domain_t &d, int) { return d; }
+
+  static const OneDomain_t &getDomain(const Domain_t &d, int) { return d; }
+
+  template<class T>
+  static void setDomain(Storage_t &dom, const T &newdom) {
+    dom[0] = newdom.first();  
+    dom[1] = newdom.length();
+  }
+
+  template<class T1, class T2>
+  static void setDomain(Storage_t &dom, const T1 &begval, const T2 &endval) {
+    dom[0] = begval;
+    dom[1] = (endval - begval + 1);
+  }
+
+};
+
+class Interval : public Domain<DomainTraits<Interval> >
+{
+public:
+  Interval(const Interval &a) : Domain<DomainTraits<Interval> >() {    
+    for (int i=0; i < DomainTraits<Interval>::dimensions; ++i)
+      DomainTraits<Interval>::getDomain(*this, i).setDomain(
+                                DomainTraits<Interval>::getDomain(a, i));
+  }
+
+  Interval(int a) : Domain<DomainTraits<Interval> >()
+  {
+    DomainTraits<Interval>::setDomain(domain_m, 0, a - 1);
+  }
+};
+
+template<>
+struct DomainTraits<Loc>
+{
+  typedef int Size_t;
+  typedef int Element_t;
+  typedef Loc Domain_t;
+  typedef Loc AskDomain_t;
+  typedef Loc MultResult_t;
+  typedef int Storage_t;
+
+  static int first(int d) { return d; }
+
+  template<class T>
+  static void setDomain(int &dom, const T &newdom) {
+    dom = DomainTraits<T>::getFirst(newdom);
+  }
+};
+
+template<>
+struct DomainTraits<int>
+ {
+  enum { dimensions = 1 };
+  enum { wildcard = false };
+
+  static int getPointDomain(int d, int) { return d; }
+
+  static int getFirst(const int &d) { return d; }
+};
+
+class Loc : public Domain<DomainTraits<Loc> >
+{
+public:
+  explicit Loc(const int &a) : Domain<DomainTraits<Loc> >() {
+    for (int i=0; i < 1; ++i)
+      (*this)[i].setDomain(DomainTraits<int>::getPointDomain(a, 0));
+  }
+};
+
+struct ElementProperties
+{
+  enum { hasTrivialDefaultConstructor = false };
+  enum { hasTrivialDestructor = false };
+
+  static void construct(double* addr)
+  {
+    new (addr) double();
+  }
+
+  static void construct(double* addr, const double& model)
+  {
+    new (addr) double(model);
+  }
+
+  static void destruct(double *addr) {}
+};
+
+class RefCounted
+{
+public:
+  RefCounted() : count_m(0) {}
+
+  void addReference() { ++count_m; }
+  bool removeRefAndCheckGarbage()
+  {
+    return (--count_m == 0);
+  }
+
+private:
+  int count_m;
+};
+
+class RefBlockController : public RefCounted
+{
+public:
+  explicit RefBlockController(unsigned int size)
+    : pBegin_m(0), pEnd_m(0), pEndOfStorage_m(0), dealloc_m(false)
+  {
+    reallocateStorage(size, false);
+
+    if (!ElementProperties::hasTrivialDefaultConstructor)
+      {
+        for (double * pt = begin(); pt != end(); ++pt)
+          ElementProperties::construct(pt);
+      }
+  }
+  
+  ~RefBlockController()
+  {
+    deleteStorage();
+  }
+
+  double *begin() const
+  {
+    return pBegin_m;
+  }
+
+  double *end() const
+  {
+    return pEnd_m;
+  }
+
+  bool isMine() const
+  {
+    return dealloc_m;
+  }
+
+private:
+  void deleteStorage()
+  {
+    if (isMine() && pBegin_m != 0)
+      {
+        if (!ElementProperties::hasTrivialDestructor)
+          for (double *pt = begin(); pt != end(); ++pt)
+            ElementProperties::destruct(pt);
+
+        char *tmp = reinterpret_cast<char *>(pBegin_m);
+        delete [] tmp;
+      }
+  }
+
+  void reallocateStorage(unsigned int newsize, bool copyold = false)
+  {
+    double *pBeginNew = 0;
+    double *pEndNew = 0;
+    double *pEndOfStorageNew = 0;
+
+    if (newsize > 0)
+      {
+        int nsize = newsize * sizeof(double);
+        char *tmp = new char[nsize];
+        pBeginNew = reinterpret_cast<double *>(tmp);
+        pEndNew = pBeginNew + newsize;
+        pEndOfStorageNew = pBeginNew + (nsize / sizeof(double));
+
+        if (copyold)
+          {
+            double * pOld = begin();
+            double * pNew = pBeginNew;
+            while (pOld != end() && pNew != pEndNew)
+              ElementProperties::construct(pNew++,*pOld++);
+          }
+      }
+
+    deleteStorage();
+
+    pBegin_m = pBeginNew;
+    pEnd_m = pEndNew;
+    pEndOfStorage_m = pEndOfStorageNew;
+    dealloc_m = true;
+  }
+
+  double *pBegin_m;
+  double *pEnd_m;
+  double *pEndOfStorage_m;
+  bool dealloc_m;
+};
+
+class DataBlockController : public RefBlockController
+{
+public:
+  explicit
+  DataBlockController(unsigned int size)
+    : RefBlockController(size), dataObjectPtr_m(new char), owned_m(true) {}
+
+  ~DataBlockController()
+  {
+    if (owned_m) delete dataObjectPtr_m;
+  }
+
+private:
+  mutable char *dataObjectPtr_m;
+  bool owned_m;
+};
+
+class RefCountedPtr
+{
+public:
+  RefCountedPtr(DataBlockController * const pT) : ptr_m(pT)
+    { if (isValid()) ptr_m->addReference(); }
+
+  ~RefCountedPtr() { invalidate(); }
+
+  DataBlockController* operator->() const { return ptr_m; }
+  void invalidate();
+  bool isValid() const { return ptr_m != 0; }
+
+private:
+  friend class RefCountedBlockPtr;
+  DataBlockController * ptr_m;
+};
+
+inline void RefCountedPtr::invalidate()
+{
+  if ( isValid() && ptr_m->removeRefAndCheckGarbage() )
+    delete ptr_m;
+  ptr_m = 0;
+}
+
+class RefCountedBlockPtr
+{
+public:
+  explicit RefCountedBlockPtr(unsigned int size)
+    : offset_m(0),
+      blockControllerPtr_m(new DataBlockController(size)) {}
+
+  int offset() const
+  {
+    return offset_m;
+  }
+
+  double *beginPointer() const
+  {
+    return blockControllerPtr_m->begin();
+  }
+
+  double *currentPointer() const
+  {
+    return beginPointer() + offset();
+  }
+
+protected:
+  int offset_m;
+  RefCountedPtr blockControllerPtr_m;
+};
+
+class DataBlockPtr : public RefCountedBlockPtr
+{
+public:
+  explicit DataBlockPtr(unsigned int size) : RefCountedBlockPtr(size) {}
+};
+
+class Node
+{
+public:
+  Node(const Interval &owned, const Interval &allocated)
+    : domain_m(owned), allocated_m(allocated) {}
+
+  const Interval &allocated() const { return allocated_m; }
+
+private:
+  Interval domain_m;
+  Interval allocated_m;
+};
+
+class DomainLayout
+{
+public:
+  explicit DomainLayout(const Interval &dom) : node_m(0, dom) {}
+
+  const Interval &domain() const
+  {
+    return node_m.allocated();
+  }
+
+private:
+  Node node_m;
+};
+
+class BrickBase
+{
+public:
+  explicit BrickBase(const Interval &domain);
+
+  int offset(const Loc &dom) const { return off_m + dom[0].first(); }
+
+protected:
+  DomainLayout layout_m;
+  int firsts_m;
+  int off_m;
+};
+
+BrickBase::BrickBase(const Interval &dom)
+  : layout_m(dom)
+{
+  firsts_m = layout_m.domain()[0].first();
+  off_m = -firsts_m;
+}
+
+class Engine : public BrickBase
+{
+public:
+  explicit Engine(const Interval &dom)
+  : BrickBase(dom), dataBlock_m(dom.size()), data_m(dataBlock_m.currentPointer()) {}
+
+  double& operator()(const Loc &loc) const
+  {
+    return data_m[this->offset(loc)];
+  }
+
+private:
+  DataBlockPtr dataBlock_m;
+  double *data_m;
+};
+
+
+int main()
+{
+  Interval I(10);
+  Engine A(I);
+
+  for (int i = 0; i < 10; i++)
+    A(Loc(i)) = 2.0 + i - i*i;
+
+  return 0;
+}