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From: "pkoning at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/50189] New: Wrong code error in -O2 compile, target independent
Date: Thu, 25 Aug 2011 17:19:00 -0000 [thread overview]
Message-ID: <bug-50189-4@http.gcc.gnu.org/bugzilla/> (raw)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50189
Bug #: 50189
Summary: Wrong code error in -O2 compile, target independent
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: major
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: pkoning@gcc.gnu.org
Created attachment 25105
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25105
Test program
The attached test program compiles to wrong code with GCC 4.5.3 (and 4.5.1)
when compiled -O2. GCC 4.6.1 gets it right.
I did some digging and determined that the problem shows up in the
-fdump-tree-all output in the .068t.vrp1 dump file; the preceding file
(.067.mergephi2) is correct. In the generated code that corresponds to the
check_pos method, the second compare "if (m_timestamp != a_timestamp)" is
transformed into "if (3 == a_timestamp)". If m_timestamp were of time
position_t (an enum of range 0..3) that would be correct, but m_timestamp is an
unsigned int so it can, and in our application does, have values larger than 3.
next reply other threads:[~2011-08-25 17:18 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-25 17:19 pkoning at gcc dot gnu.org [this message]
2011-08-25 17:21 ` [Bug c++/50189] " pkoning at gcc dot gnu.org
2011-08-25 17:43 ` pkoning at gcc dot gnu.org
2011-08-25 18:34 ` [Bug c++/50189] [4.5 Regression] " pinskia at gcc dot gnu.org
2011-08-26 8:01 ` [Bug middle-end/50189] " rguenth at gcc dot gnu.org
2011-08-26 8:27 ` jakub at gcc dot gnu.org
2011-08-26 8:32 ` [Bug middle-end/50189] [4.5/4.6 Regression] Wrong code error in -O2 [-fstrict-enums] " rguenth at gcc dot gnu.org
2011-09-09 19:35 ` pkoning at gcc dot gnu.org
2011-10-10 20:42 ` pkoning at gcc dot gnu.org
2011-10-11 9:06 ` rguenth at gcc dot gnu.org
2011-10-11 9:09 ` rguenth at gcc dot gnu.org
2011-10-11 19:03 ` pkoning at gcc dot gnu.org
2011-10-12 11:43 ` rguenth at gcc dot gnu.org
2011-10-12 14:05 ` pkoning at gcc dot gnu.org
2011-10-12 14:17 ` rguenther at suse dot de
2011-10-12 14:23 ` rguenther at suse dot de
2011-10-12 15:14 ` rguenth at gcc dot gnu.org
2011-10-12 15:17 ` [Bug middle-end/50189] [4.5 " rguenth at gcc dot gnu.org
2011-10-12 15:18 ` [Bug middle-end/50189] [4.5/4.6 " rguenth at gcc dot gnu.org
2012-01-03 15:29 ` [Bug middle-end/50189] [4.5 " rguenth at gcc dot gnu.org
2012-01-03 15:29 ` rguenth at gcc dot gnu.org
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