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From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/18842] Weak optimization on global references Date: Sun, 05 Dec 2004 15:14:00 -0000 [thread overview] Message-ID: <20041205151415.21088.qmail@sourceware.org> (raw) In-Reply-To: <20041205085537.18842.felix.nawothnig@t-online.de> ------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-05 15:14 ------- Consider these two TUs: extern int *y, x, z; int foo(); extern "C" void abort(); int main() { foo(); if (*y!=42) abort(); if (y!=&x) abort(); y = &z; foo (); if (*y!=42) abort(); if (y!=&z) abort(); return 0; } ----- int x, &y = x, z; int foo() { y = 42; } ----- Now I think the above is invalid C++ but we don't have to diagnostic since the standard allows us not to but since the standard allows the correct way, we can optimizate global references now. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Component|c++ |tree-optimization Ever Confirmed| |1 Keywords| |missed-optimization Last reconfirmed|0000-00-00 00:00:00 |2004-12-05 15:14:15 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18842
next prev parent reply other threads:[~2004-12-05 15:14 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-12-05 8:55 [Bug c++/18842] New: " felix dot nawothnig at t-online dot de 2004-12-05 8:58 ` [Bug c++/18842] " felix dot nawothnig at t-online dot de 2004-12-05 14:53 ` steven at gcc dot gnu dot org 2004-12-05 15:00 ` pinskia at gcc dot gnu dot org 2004-12-05 15:14 ` pinskia at gcc dot gnu dot org [this message] 2004-12-05 19:11 ` [Bug tree-optimization/18842] " felix dot nawothnig at t-online dot de 2004-12-05 19:15 ` pinskia at gcc dot gnu dot org [not found] <bug-18842-9734@http.gcc.gnu.org/bugzilla/> 2006-03-05 21:30 ` pinskia at gcc dot gnu dot org 2006-07-16 14:23 ` felix dot nawothnig at t-online dot de 2006-07-16 20:36 ` rguenth at gcc dot gnu dot org 2009-04-22 22:02 ` pinskia at gcc dot gnu dot org
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