When I compile ace542 with the actual snapshot (20050806) of gcc41 I get an ICE when I use: -O3 -g -floop-optimize2 -ftree-vectorize.
last working snapshot is: gcc-4.1-20050723 first failing snapshot is: gcc-4.1-20050730 Michael Cieslinski g++41j -O3 -g -floop-optimize2 -ftree-vectorize -c -o .obj/Proactor_Test_IPV6.o Proactor_Test_IPV6.ii Proactor_Test_IPV6.cpp: In constructor 'Connector::Connector()': Proactor_Test_IPV6.cpp:925: error: definition in block 6 does not dominate use in block 9 for SSA_NAME: TMT.3445_18(ab) in statement: TMT.3445_58(ab) = PHI <TMT.3445_57(ab)(3), TMT.3445_18(ab)(9), TMT.3445_57(ab) (11)>; PHI argument TMT.3445_18(ab) for PHI node TMT.3445_58(ab) = PHI <TMT.3445_57(ab)(3), TMT.3445_18(ab)(9), TMT.3445_57(ab) (11)>; Proactor_Test_IPV6.cpp:925: internal compiler error: verify_ssa failed Please submit a full bug report, with preprocessed source if appropriate. g++41j -v Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: ../gcc-4.1-20050806/configure --prefix=/usr/local/gcc41j -- program-suffix=41j --with-arch=opteron --enable-languages=c,c++ --enable- checking Thread model: posix gcc version 4.1.0 20050806 (experimental) -- Summary: ICE: verify_ssa failed - definition does not dominate use Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: tree-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: micis at gmx dot de CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: x86_64-unknown-linux-gnu GCC host triplet: x86_64-unknown-linux-gnu GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23352