extern void abort (); void __attribute__((noinline)) bar (unsigned long long i) { if (i) abort (); } static void __attribute__((always_inline)) foo (unsigned long long *r) { int i; for (i = 0; ; i++) if (*r & ((unsigned long long)1 << (63 - i))) break; bar (i); } void __attribute__((noinline)) do_test (unsigned long long *r) { int i; for (i = 0; i < 2; ++i) foo (r); } int main() { unsigned long long r = 0x8000000000000001ull; do_test (&r); return 0; }