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Date: Mon, 08 Jul 2002 14:26:00 -0000
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From: Sven Lundblad <svlu@enea.se>
Subject: Re: optimization/7232: Incorrect code generate for volatiles
Reply-To: Sven Lundblad <svlu@enea.se>
X-SW-Source: 2002-07/txt/msg00252.txt.bz2
List-Id: <gcc-prs.sourceware.org>

The following reply was made to PR optimization/7232; it has been noted by GNATS.

From: Sven Lundblad <svlu@enea.se>
To: Franz.Sirl-kernel@lauterbach.com
Cc: gcc-gnats@gcc.gnu.org,
 karm@enea.se,
 steby@enea.se
Subject: Re: optimization/7232: Incorrect code generate for volatiles
Date: Mon, 8 Jul 2002 23:29:48 +0200

 Hi,
 
 Thanks for the fast response! The generated code is still incorrect. Note the 
 two lwz instructtions that loads from the same address (r11+8). Please see my 
 comments below (and please correct me if I'm wrong).
 
 Regards,
 Sven Lundblad
 
  .file   "test.c"
           .section        ".text"
           .align 2
           .type   force_gcc_ppc_bug,@function
  force_gcc_ppc_bug:
           lis 11,ll@ha     /* load address of ll into r11 high */
           li 0,4660
           la 11,ll@l(11)   /* load address of ll into r11 low */
           lwz 10,8(11)    /* load ll.rtFreeList into r10, should be
                                  ll.rtFreeList->next (the lnk variable) ??? */
           lwz 9,8(11)      /* load ll.rtFreeList into r9 */
           stw 0,0(10)     /* store 0x1234 into ll.rtFreeList->dummy WRONG! */
           mr 3,10          /* put ll.rtFreeList into r3 (but should be the lnk
                                  pointer) */
           lwz 0,4(9)       /* load ll.rtFreeList->next into r0 */
           li 9,0
           stw 0,8(11)     /* store ll.rtFreeList->next into ll.rtFreeList */
           li 0,18
           stw 9,4(10)
           stb 0,42(10)    /* store 0x12 into space outside allocated data! */
           blr
  .Lfe1:
           .size   force_gcc_ppc_bug,.Lfe1-force_gcc_ppc_bug
           .comm   ll,12,4
           .ident  "GCC: (GNU) 3.1.1 20020704 (prerelease)"