re PR tree-optimization/69355 (Wrong results with -O1 optimization)

PR c++/69355
	* tree-dfa.c (get_ref_base_and_extent): Use GET_MODE_BITSIZE (mode)
	for bitsize instead of GET_MODE_PRECISION (mode).

	* g++.dg/torture/pr69355.C: New test.

From-SVN: r232663

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2016-01-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/69355
+	* tree-dfa.c (get_ref_base_and_extent): Use GET_MODE_BITSIZE (mode)
+	for bitsize instead of GET_MODE_PRECISION (mode).
+
 2016-01-20  Martin Sebor  <msebor@redhat.com>
 
 	PR c/52291

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2016-01-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/69355
+	* g++.dg/torture/pr69355.C: New test.
+
 2016-01-21  Aditya Kumar  <aditya.k7@samsung.com>
 	    Sebastian Pop  <s.pop@samsung.com>
 

gcc/testsuite/g++.dg/torture/pr69355.C

@@ -0,0 +1,150 @@
+// PR c++/69355
+// { dg-do run }
+
+template <int> struct A;
+template <> struct A<1> {};
+template <class Obj, int> struct B
+{
+  template <class T> struct C
+  {
+    typedef T *iterator;
+    C (iterator p1) : m_iter (p1) {}
+    void operator, (T p1) { *m_iter = p1; }
+    iterator m_iter;
+  };
+  typedef double *iterator;
+  B (Obj &p1, double) : m_object (p1) {}
+  C<double> operator, (double);
+  Obj &m_object;
+};
+template <class Obj, int LEN>
+typename B<Obj, LEN>::template C<double>
+B<Obj, LEN>::operator, (double p1)
+{
+  iterator a = m_object.data (), b = a + 1;
+  *a = 1;
+  *b = p1;
+  return C<double>(b + 1);
+}
+class D {};
+inline double operator+(const double &p1, D) { return p1; }
+template <int> class U;
+template <int Sz, int K = 0> struct F
+{
+  enum { doIt = K < Sz - 1 ? 1 : 0 };
+  template <class Dest, class Src, class Assign>
+  static void assign (Dest &p1, Src &p2, Assign &p3)
+  {
+    p3.apply_on (p1 (K), p2 (K));
+    F<Sz * doIt, (K + 1) * doIt>::assign (p1, p2, p3);
+  }
+  template <class Dest, class Src> static double dot (Dest &p1, Src &p2)
+  {
+    return p1 (K) * p2 (K) + F<Sz * doIt, (K + 1) * doIt>::dot (p1, p2);
+  }
+};
+template <> struct F<0>
+{
+  template <class Dest, class Src, class Assign>
+  static void assign (Dest &, Src &, Assign &) {}
+  template <class Dest, class Src> static D dot (Dest &, Src &) { return D (); }
+};
+template <class E, int Sz> struct G
+{
+  enum { ops_assign, use_meta };
+  G (const E &p1) : m_expr (p1) {}
+  double operator()(int p1) const { return m_expr (p1); }
+  template <class Dest, class Src, class Assign>
+  static void do_assign (A<1>, Dest &p2, Src &p3, Assign &p4)
+  {
+    F<Sz>::assign (p2, p3, p4);
+  }
+  template <class Dest, class Assign>
+  void assign_to (Dest &p1, const Assign &p2) const
+  {
+    do_assign (A<1>(), p1, *this, p2);
+  }
+  E m_expr;
+};
+struct H
+{
+  static double apply_on (double p1, long double p2) { return p1 / p2; }
+  static void apply_on (double &p1, double p2) { p1 = p2; }
+};
+template <class E1, class E2> struct I
+{
+  I (const E1 &p1, const E2 &p2) : m_lhs (p1), m_rhs (p2) {}
+  double operator()(int p1) const
+  {
+    double c = m_lhs (p1);
+    return H::apply_on (c, m_rhs (0));
+  }
+  E1 m_lhs;
+  const E2 m_rhs;
+};
+struct J
+{
+  J (double p1) : m_data (p1) {}
+  long double operator()(int) const { return m_data; }
+  long double m_data;
+};
+template <int Sz> struct K
+{
+  K (const U<Sz> &p1) : m_data (p1.data ()) {}
+  double operator()(int p1) const { return m_data[p1]; }
+  const double *m_data;
+};
+template <int Sz> struct U
+{
+  U () {}
+  U (const U &p1)
+  {
+    *this = G<ConstReference, Sz>(p1.const_ref ());
+  }
+  B<U, Sz> operator=(double) { return B<U, Sz>(*this, 0); }
+  double *data () { return m_data; }
+  const double *data () const { return m_data; }
+  double &operator()(int p1) { return m_data[p1]; }
+  double operator()(int p1) const { return m_data[p1]; }
+  typedef K<Sz> ConstReference;
+  ConstReference const_ref () const { return *this; }
+  template <class E> void operator=(const G<E, Sz> &p1)
+  {
+    p1.assign_to (*this, H ());
+  }
+  double m_data[Sz];
+};
+template <int Sz>
+G<I<K<Sz>, J>, Sz> div (U<Sz> &p1, double p2)
+{
+  typedef I<K<Sz>, J> expr_type;
+  return G<expr_type, Sz>(expr_type (p1.const_ref (), p2));
+}
+template <int Sz> double norm2 (U<Sz> &p1)
+{
+  return __builtin_sqrt (F<Sz>::dot (p1, p1));
+}
+template <int Sz>
+G<I<K<Sz>, J>, Sz> operator/(U<Sz> &p1, double p2)
+{
+  return div (p1, p2);
+}
+typedef U<3> V;
+V foo (V p1)
+{
+  double e = norm2 (p1);
+  V r;
+  r = p1 / e;
+  return r;
+}
+int
+main ()
+{
+  V f;
+  f = 1, 2, 3;
+  V r = foo (f);
+  if (__builtin_fabs (r (0) - 0.267261) > 0.01
+      || __builtin_fabs (r (1) - 0.534522) > 0.01
+      || __builtin_fabs (r (2) - 0.801784) > 0.01)
+    __builtin_abort ();
+}

gcc/tree-dfa.c

@@ -395,7 +395,7 @@ get_ref_base_and_extent (tree exp, HOST_WIDE_INT *poffset,
       if (mode == BLKmode)
 	size_tree = TYPE_SIZE (TREE_TYPE (exp));
       else
-	bitsize = int (GET_MODE_PRECISION (mode));
+	bitsize = int (GET_MODE_BITSIZE (mode));
     }
   if (size_tree != NULL_TREE
       && TREE_CODE (size_tree) == INTEGER_CST)