https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83323
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- Fails with -O2 -funroll-and-jam --param unroll-jam-min-percent=0 int x[1024], y[1024]; void __attribute__((noipa)) foo () { for (int i = 0; i < 1024; ++i) { x[i] = 0; for (int j = 0; j < 1024; ++j) if (!y[j]) x[i] = 1; } } int main() { y[1023] = 1; foo (); if (x[1] != 1) __builtin_abort (); return 0; }