[Bug target/21389] optimized code seg faults due to double load on sparcV9

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

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-06 19:07 -------
(In reply to comment #4)
> Subject: RE:  optimized code seg faults due to double load on sparcV9
> 
> I don't think so.  Malloc does not guarantee anything but mod-4
> alignment.  You have to use memalign to get something better (at least
> on a Sun).  I only did the +4 pointer stuff to ensure that the double
> would be misaligned mod8, as this is what was happening in my code.  As
> long as I am on a mod4 boundary for my struct, the -munaligned-doubles
> flag should force the handling of doubles as though they are unaligned.
> The compiler with no optimization does this.  But as soon as you turn on
> -O1, it ignores the unaligned-doubles directive.

Again what you said about malloc is not true and has not been true since 1989.
The C standard says malloc aligns things the largest alignment required for that machine.  In this case 
doubles are aligned by 8.  So your code is invalid.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21389