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[Bug c++/12340] New: [3.2 regression] loop unroller + gcse produces wrong code
- From: "rguenth at tat dot physik dot uni-tuebingen dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 19 Sep 2003 15:10:43 -0000
- Subject: [Bug c++/12340] New: [3.2 regression] loop unroller + gcse produces wrong code
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12340
Summary: [3.2 regression] loop unroller + gcse produces wrong
code
Product: gcc
Version: 3.3.2
Status: UNCONFIRMED
Severity: critical
Priority: P1
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: rguenth at tat dot physik dot uni-tuebingen dot de
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
If compiling with -O2 -fno-exceptions -funroll-loops the testcase segfaults in a
destructor, with -fno-gcse added or -funroll-loops removed, the testcase is
fine. This problem does not appear on gcc 3.2.3 or gcc 3.4 with either
-funroll-loops or -fold-unroll-loops.
Testcase is available from
http://www.tat.physik.uni-tuebingen.de/~rguenth/gcc/brick_test1.bug.ii.gz
gcc-3.3 version tested is
g++-3.3 (GCC) 3.3.2 20030919 (prerelease)
Richard.