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From: "steven 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: Sun, 24 Sep 2006 10:08:00 -0000 [thread overview] Message-ID: <20060924100815.32334.qmail@sourceware.org> (raw) In-Reply-To: <bug-28230-7667@http.gcc.gnu.org/bugzilla/> ------- Comment #15 from steven at gcc dot gnu dot org 2006-09-24 10:08 ------- Significant difference: n_15: [0, +INF] EQUIVALENCES: { } (0 elements) without -fwrapv n_15: [1, 65534] EQUIVALENCES: { } (0 elements) with -fwrapv With -fwrapv this results in: Folding predicate n_15 != 0 to 1 Folded statement: if (n_15 != 0) goto <L7>; else goto <L6>; into: if (1) goto <L7>; else goto <L6>; which is the infinite loop here. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28230
next prev parent reply other threads:[~2006-09-24 10:08 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 [this message] 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 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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