[Bug tree-optimization/43783] [4.5/4.6 regression] -O -ftree-pre options compile libbid wrong

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2010-04-19 11:20 -------
Testcase:

typedef __attribute__((aligned(16)))
struct {
    unsigned long w[3];
} UINT192;

UINT192 __bid_Kx192[32];

extern void abort (void);

int main()
{
  int i = 0;
  unsigned long x = 0;
  for (i = 0; i < 32; ++i)
    __bid_Kx192[i].w[1] = i == 1;
  for (i = 0; i < 32; ++i)
    x += __bid_Kx192[1].w[1];
  if (x != 32)
    abort ();
  return 0;
}


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43783