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Date: Sat, 10 Aug 2002 06:46:00 -0000
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From: Jan Hubicka <jh@suse.cz>
Subject: Re: target/7559: kdelibs miscompilation
Reply-To: Jan Hubicka <jh@suse.cz>
X-SW-Source: 2002-08/txt/msg00211.txt.bz2
List-Id: <gcc-prs.sourceware.org>

The following reply was made to PR target/7559; it has been noted by GNATS.

From: Jan Hubicka <jh@suse.cz>
To: Gwenole Beauchesne <gbeauchesne@mandrakesoft.com>
Cc: gcc-gnats@gcc.gnu.org, david@mandrakesoft.com, aj@suse.de,
	jh@suse.cz, nobody@gcc.gnu.org, gcc-prs@gcc.gnu.org,
	gcc-bugs@gcc.gnu.org
Subject: Re: target/7559: kdelibs miscompilation
Date: Sat, 10 Aug 2002 15:14:14 +0200

 > 3) The last testcase is ultra-reduced to a two eightbytes object, with 
 > only one member in each one. That one do fails.
 > 
 > extern void abort();
 > 
 > struct A {
 >   long x;
 > };
 > 
 > struct R {
 >   struct A a, b;
 > };
 > 
 > struct R R = {
 >   100, 200
 > };
 > 
 > void f(struct R r) {
 >   if (r.a.x != R.a.x || r.b.x != R.b.x)
 >     abort();
 > }
 > 
 > int main() {
 >   f(R);
 >   return 0;
 > }
 
 This looks like a bug in code computing offests of nested aggregates.  I
 am just checking it.
 Thanks a lot for reducing the testcase! This is really usefull one :)
 
 Honza
 > 
 > 4) The <struct.c> testcase won't fail if we add some garbage in struct R, 
 > because the size of the object will be > 16 bytes, thus having MEMORY 
 > class.
 > 
 > HTH,
 > Gwenole.