http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48774
davidxl <xinliangli at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |xinliangli at gmail dot com --- Comment #3 from davidxl <xinliangli at gmail dot com> 2011-04-27 19:04:12 UTC --- (In reply to comment #2) > It is caused by revision 162653: > > http://gcc.gnu.org/ml/gcc-cvs/2010-07/msg01007.html Looked at IVOPT transformation -- seems ok. The program passes with the following options: -O2 -funroll-loops regression.c -fno-tree-vrp -fno-tree-dominator-opts -fno-gcse Removing any of the -fno-xxx options, the program fail. -fno-gcse makes difference indicates tree level transformations are fine -- possibly bad aliasing? David