[Bug rtl-optimization/47698] CMOV accessing volatile memory with read side effect

[matz at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47698

Michael Matz <matz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |matz at gcc dot gnu.org

--- Comment #4 from Michael Matz <matz at gcc dot gnu.org> 2011-02-11 17:05:57 
UTC ---
noce_operand_ok doesn't disregard volatile MEMs:

  /* We special-case memories, so handle any of them with
     no address side effects.  */
  if (MEM_P (op))
    return ! side_effects_p (XEXP (op, 0));

But I don't see where we would handle volatile MEMs in any sensible
way.  We happily fiddle with such operands resulting in the problem.