[Bug c++/45462] Bad optimization in -O3 sometimes

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2010-08-31 14:17 -------
 inline __attribute__((__always_inline__)) uint32 READ_UINT32(const void *ptr)
{
  struct Unaligned32 { uint32 val; } __attribute__ ((__packed__));
  return ((const Unaligned32 *)ptr)->val;
 }

and similar look like they might violate C aliasing rules.  Try using
-fno-strict-aliasing.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45462