[Bug target/30271] -mstrict-align can cause bad code generation for struct agrument passing

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from pinskia at gcc dot gnu dot org  2006-12-21 22:23 -------
The problem is that we force the struct to be BLKmode from DImode with:
  /* If structure's known alignment is less than what the scalar
     mode would need, and it matters, then stick with BLKmode.  */
  if (TYPE_MODE (type) != BLKmode
      && STRICT_ALIGNMENT
      && ! (TYPE_ALIGN (type) >= BIGGEST_ALIGNMENT
            || TYPE_ALIGN (type) >= GET_MODE_ALIGNMENT (TYPE_MODE (type))))
    {
      /* If this is the only reason this type is BLKmode, then
         don't force containing types to be BLKmode.  */
      TYPE_NO_FORCE_BLK (type) = 1;
      TYPE_MODE (type) = BLKmode;
    }

Which causes us to store this to the stack all the time.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30271