[Bug debug/108843] timeout with -g -O3 since r9-2635-g78ea9abc2018243a

["marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108843

--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case where adding -g takes 20x longer to compile:

$ typedef uint16_t;
typedef uint32_t;
typedef uint64_t;
(safe_rshift_func_int8_t_s_s)() {}
struct S0 {
  signed f0 : 5
};
union U1 {
  short f0;
};
static int g_2 = 0xE60F951FL;
static signed char g_30 = 0x6EL;
static signed char g_61 = 0x39L;
static unsigned char g_69 = 0xA9L;
static signed char g_113 = 7L;
static short g_136 = 0;
static uint64_t g_138 = 0x3DAD6103D800CEE5LL;
static int g_257 = 1L;
static struct S0 g_513;
static int g_1457 = 0xA3396F68L;
static union U1 func_17(int p_19, uint16_t p_20);
static uint32_t func_1(void) {
  int l_332 = 0L;
  for (g_2; (g_2 <= 29); g_2) {
    struct S0 l_333 = {2, 9};
    union U1 l_1264[7];
    int *l_1463 = &g_1457;
    (*l_1463) ^= func_5(0, (+func_14(func_17(l_332, g_113), g_513)), l_1264[3],
                        l_333.f0);
  }
}
static union U1 func_17(int p_19, uint16_t p_20) {
  p_20 = 1;

  for (p_20; (p_20 <= 8); p_20 += 1) {
    union U1 l_346 = {4, 15};
    for (g_138 = 0; (g_138 <= 8); g_138 += 1)

      for (g_61 = 0; (g_61 <= 8); g_61 += 1)
        for (g_69 = 1; (g_69 <= 8); g_69 += 1) {
          short *l_347[6][6][6] = {
              {{&l_346.f0, &g_136, &l_346.f0, 00, &l_346.f0, &l_346.f0},
               {&g_136, &l_346.f0, 00, &g_136, 00, &l_346.f0}}};
          int l_348 = 0x02A82EBAL;
          signed char *l_349 = &g_30;
          g_257 &= (((*l_349) ^= (safe_rshift_func_int8_t_s_s(0, 2))), (-8L));
        }
  }
}
int main(int argc, char *argv[]) { func_1(); }