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From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/28230] [4.2 Regression] -O2 -fwrapv miscompiles gcc, binutils, gzip.
Date: Tue, 10 Oct 2006 14:33:00 -0000 [thread overview]
Message-ID: <20061010143250.30956.qmail@sourceware.org> (raw)
In-Reply-To: <bug-28230-7667@http.gcc.gnu.org/bugzilla/>
------- Comment #17 from rguenth at gcc dot gnu dot org 2006-10-10 14:32 -------
No, it's extract_range_from_binary_expr operating on [0, +INF] + [0, 65535] and
blindly using int_const_binop to compute the resulting range...
I believe the following is completely bogus and we cannot ignore overflows
in range arithmetic for wrapv either.
static inline tree
vrp_int_const_binop (enum tree_code code, tree val1, tree val2)
{
tree res;
if (flag_wrapv)
return int_const_binop (code, val1, val2, 0);
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rguenth at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
Last reconfirmed|2006-09-21 03:31:17 |2006-10-10 14:32:50
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28230
next prev parent reply other threads:[~2006-10-10 14:33 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-03 8:40 [Bug other/28230] New: ICE during profiled bootstrap pluto at agmk dot net
2006-07-03 11:25 ` [Bug other/28230] " pluto at agmk dot net
2006-07-04 21:16 ` pluto at agmk dot net
2006-08-03 20:39 ` [Bug other/28230] ICE during bootstrap (-O2 -fwrapv issue) pluto at agmk dot net
2006-08-03 20:41 ` pluto at agmk dot net
2006-08-03 20:42 ` pluto at agmk dot net
2006-09-01 20:11 ` pluto at agmk dot net
2006-09-19 13:08 ` [Bug other/28230] -O2 -fwrapv miscompiles gcc, binutils, gzip pluto at agmk dot net
2006-09-20 20:44 ` pluto at agmk dot net
2006-09-20 20:45 ` pluto at agmk dot net
2006-09-20 23:31 ` pluto at agmk dot net
2006-09-21 3:31 ` [Bug tree-optimization/28230] [4.2 Regression] " pinskia at gcc dot gnu dot org
2006-09-21 3:37 ` pinskia at gcc dot gnu dot org
2006-09-24 9:58 ` steven at gcc dot gnu dot org
2006-09-24 10:05 ` steven at gcc dot gnu dot org
2006-09-24 10:08 ` steven at gcc dot gnu dot org
2006-09-24 10:11 ` steven at gcc dot gnu dot org
2006-10-01 22:56 ` mmitchel at gcc dot gnu dot org
2006-10-10 14:33 ` rguenth at gcc dot gnu dot org [this message]
2006-10-11 10:45 ` patchapp at dberlin dot org
2006-10-11 16:06 ` rguenth at gcc dot gnu dot org
2006-10-11 16:06 ` rguenth at gcc dot gnu dot org
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