http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49773
--- Comment #1 from vincenzo Innocente <vincenzo.innocente at cern dot ch> 2011-07-18 14:11:11 UTC --- I just upgraded to c++ -v Using built-in specs. COLLECT_GCC=c++ COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/x86_64-apple-darwin10.8.0/4.7.0/lto-wrapper Target: x86_64-apple-darwin10.8.0 Configured with: ./configure --enable-languages=c,c++,fortran --enable-lto --with-build-config=bootstrap-lto CFLAGS='-O2 -ftree-vectorize -fPIC' CXXFLAGS='-O2 -fPIC -ftree-vectorize -fvisibility-inlines-hidden' Thread model: posix gcc version 4.7.0 20110716 (experimental) (GCC) and it seem to vectorize fine… was stil not ok in gcc version 4.7.0 20110702 (experimental) (GCC) it still pretends to check for test/vectClass.cpp:11: note: Detected interleaving this_9(D)->a and this_9(D)->b test/vectClass.cpp:11: note: versioning for alias required: can't determine dependence between this_9(D)->a and *D.1537_8 test/vectClass.cpp:11: note: mark for run-time aliasing test between this_9(D)->a and *D.1537_8 test/vectClass.cpp:11: note: versioning for alias required: can't determine dependence between this_9(D)->b and *D.1537_8 test/vectClass.cpp:11: note: mark for run-time aliasing test between this_9(D)->b and *D.1537_8 I hope it will be addressed in PR49774
