https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69107
vries at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[6 Regression] def does not |[6 Regression] def does not |dominate use ICE with -O2 |dominate use ICE with -O2 |-ftree-paralellize-loops=2 |-funswitch-loops | |-ftree-paralellize-loops=2 --- Comment #3 from vries at gcc dot gnu.org --- Instead of -O3, we can use the more minimal -O2 -funswitch-loops to trigger the error.