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

["drew dot johnson at andrew dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From drew dot johnson at andrew dot com  2005-05-06 19:04 -------
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.

Drew

-----Original Message-----
From: pinskia at gcc dot gnu dot org [mailto:gcc-bugzilla@gcc.gnu.org] 
Sent: Friday, May 06, 2005 2:55 PM
To: Johnson, Drew
Subject: [Bug target/21389] optimized code seg faults due to double load
on sparcV9


------- Additional Comments From pinskia at gcc dot gnu dot org
2005-05-06 18:54 -------
I think you violating alignment rules in C:

	x = tptr[1].f3;
	p = (char *)tptr;
	p += 4;
	tptr = (test1 *)p;

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

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