for the testcase to be attached (what about enhancing bugzilla with an option to attach files at initial submit time?)
gfortran -v -c -O2 -funroll-loops -fprefetch-loop-arrays test.f90 Using built-in specs. Target: x86_64-unknown-linux-gnu Configured with: /data03/vondele/gcc_trunk/gcc/configure --prefix=/data03/vondele/gcc_trunk/build --enable-languages=c,c++,fortran --disable-multilib --with-ppl=/data03/vondele/gcc_trunk/build/ --with-cloog=/data03/vondele/gcc_trunk/build/ Thread model: posix gcc version 4.5.0 20090527 (experimental) [trunk revision 147915] (GCC) COLLECT_GCC_OPTIONS='-v' '-c' '-O2' '-funroll-loops' '-fprefetch-loop-arrays' '-mtune=generic' /data03/vondele/gcc_trunk/build/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/f951 test.f90 -quiet -dumpbase test.f90 -mtune=generic -auxbase test -O2 -version -funroll-loops -fprefetch-loop-arrays -fintrinsic-modules-path /data03/vondele/gcc_trunk/build/lib/gcc/x86_64-unknown-linux-gnu/4.5.0/finclude -o /tmp/ccDzkBkL.s GNU Fortran (GCC) version 4.5.0 20090527 (experimental) [trunk revision 147915] (x86_64-unknown-linux-gnu) compiled by GNU C version 4.5.0 20090527 (experimental) [trunk revision 147915], GMP version 4.2.2, MPFR version 2.3.1 GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 GNU Fortran (GCC) version 4.5.0 20090527 (experimental) [trunk revision 147915] (x86_64-unknown-linux-gnu) compiled by GNU C version 4.5.0 20090527 (experimental) [trunk revision 147915], GMP version 4.2.2, MPFR version 2.3.1 GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096 test.f90: In function makedcoul: test.f90:7: internal compiler error: in initialize_matrix_A, at tree-data-ref.c:1887 Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. -- Summary: -fprefetch-loop-arrays: ICE: in initialize_matrix_A, at tree-data-ref.c:1887 Product: gcc Version: 4.5.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: jv244 at cam dot ac dot uk http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40281