https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69109
Bug ID: 69109 Summary: missing phi argument ICE in transform_to_exit_first_loop_alt with -ftree-parallelize-loops=2 Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: vries at gcc dot gnu.org Target Milestone: --- ... $ gcc src/gcc/testsuite/gcc.dg/vect/unswitch-loops-pr26969.c -O2 -funswitch-loops -S -ftree-parallelize-loops=2 src/gcc/testsuite/gcc.dg/vect/unswitch-loops-pr26969.c: In function ‘ruby_re_compile_fastmap’: src/gcc/testsuite/gcc.dg/vect/unswitch-loops-pr26969.c:5:1: error: PHI argument is missing for edge 10->9 ruby_re_compile_fastmap (char *fastmap, int options) ^~~~~~~~~~~~~~~~~~~~~~~ for PHI node .MEM_2 = PHI <(10)> src/gcc/testsuite/gcc.dg/vect/unswitch-loops-pr26969.c:5:1: internal compiler error: verify_ssa failed 0x1176bd1 verify_ssa(bool, bool) /home/vries/gcc_versions/devel/src/gcc/tree-ssa.c:1039 0xfd1539 checking_verify_ssa /home/vries/gcc_versions/devel/src/gcc/tree-ssa.h:87 0xfd559e transform_to_exit_first_loop_alt /home/vries/gcc_versions/devel/src/gcc/tree-parloops.c:1755 0xfd586f try_transform_to_exit_first_loop_alt /home/vries/gcc_versions/devel/src/gcc/tree-parloops.c:1799 0xfd71e8 gen_parallel_loop /home/vries/gcc_versions/devel/src/gcc/tree-parloops.c:2299 0xfd86bb parallelize_loops /home/vries/gcc_versions/devel/src/gcc/tree-parloops.c:2747 0xfd8835 execute /home/vries/gcc_versions/devel/src/gcc/tree-parloops.c:2797 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. ...