https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63520
--- Comment #11 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- Hmm, the reduced testcase for comment 6 looks almost identical to the decNumber.i testcase. trippels@gcc2-power8 gcc % cat coverage.ii int a; void fn1 () { int b = 2; for (; a;) while (b >= 0) b--; } trippels@gcc2-power8 gcc % g++ -c -O2 -fsanitize=undefined coverage.ii g++: internal compiler error: Segmentation fault (program cc1plus)