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References: <bug-39974-1771@http.gcc.gnu.org/bugzilla/>
Subject: [Bug tree-optimization/39974] [4.5 regression] Bogus "array subscript is below array bounds" warning in compiler generated code
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------- Comment #1 from reichelt at gcc dot gnu dot org  2009-05-05 22:00 -------
Here's a reduced version without includes:

===============================================
struct X
{
  X(int, const int& = 0);
  ~X();
};

X x[2][3] = { { 0, 0, 0 }, { 0, 0, 0 } };

struct A
{
  A(int);
};

struct B
{
  A a1, a2, a3, a4, a5, a6;
};

B b[42] =
{
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 },
  { 0, 0, 0, 0, 0, 0 }
};
===============================================


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39974