https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112374
--- Comment #21 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Another reduction, unfortunately with uninitialized var use: void foo (int, int); struct S { char s[4]; }; int a, b, c; void bar () { struct S d; long e = 0; for (c = 0; c < 4; ++c) e |= (d.s[c] ? 3 : 0) << c; if (e) foo (a, b); }