https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80213
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> --- And trunk can also reproduce that: $ ./xgcc -B. /home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/graphite/interchange-3.c -Ofast --param hot-bb-frequency-fraction=55003173 -floop-parallelize-all during GIMPLE pass: graphite /home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/graphite/interchange-3.c: In function ‘foo.constprop’: /home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/graphite/interchange-3.c:13:1: internal compiler error: in check_loop_closed_ssa_use, at tree-ssa-loop-manip.c:707 foo (int N, int *res) ^~~ 0x11412e7 check_loop_closed_ssa_use ../../gcc/tree-ssa-loop-manip.c:706 0x114147e verify_loop_closed_ssa(bool) ../../gcc/tree-ssa-loop-manip.c:750 0x1a1ca5e checking_verify_loop_closed_ssa ../../gcc/tree-ssa-loop-manip.h:37 0x1a1d231 graphite_verify ../../gcc/graphite-isl-ast-to-gimple.c:82 0x1a249a0 graphite_regenerate_ast_isl(scop*) ../../gcc/graphite-isl-ast-to-gimple.c:3054 0x1a1b780 graphite_transform_loops() ../../gcc/graphite.c:344 0x1a1b836 graphite_transforms ../../gcc/graphite.c:376 0x1a1b95d execute ../../gcc/graphite.c:453 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. marxin@marxinbox:~/Programming/gcc/objdir/gcc> ./xgcc -v Using built-in specs. COLLECT_GCC=./xgcc Target: x86_64-pc-linux-gnu Configured with: ../configure --enable-languages=c,c++,fortran --disable-multilib --prefix=/home/marxin/bin/gcc --disable-bootstrap : (reconfigured) ../configure --enable-languages=c,c++,fortran --disable-multilib --prefix=/home/marxin/bin/gcc --disable-bootstrap : (reconfigured) : (reconfigured) ../configure --disable-multilib --prefix=/home/marxin/bin/gcc --disable-bootstrap --enable-languages=c,c++,fortran,lto --no-create --no-recursion : (reconfigured) Thread model: posix gcc version 8.0.0 20170920 (experimental) (GCC)