[Bug debug/108843] New: timeout with -g -O3 ?

[Bug debug/108843] New: timeout with -g -O3 ?

[dcb314 at hotmail dot com]

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

            Bug ID: 108843
           Summary: timeout with -g -O3 ?
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 54485
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54485&action=edit
C source code

The attached code does this:

$ (ulimit -t 60; time /home/dcb36/gcc/results/bin/gcc -c -w -O3 bug886.c)

real    0m0.637s
user    0m0.608s
sys     0m0.018s
$ (ulimit -t 60; time /home/dcb36/gcc/results/bin/gcc -c -w -g -O3 bug886.c)
gcc: fatal error: Killed signal terminated program cc1
compilation terminated.

real    1m0.732s
user    0m59.485s
sys     0m0.629s
$

[Bug debug/108843] timeout with -g -O3 ?

[dcb314 at hotmail dot com]

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

--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Problem seems to start sometime before 20220306.

[Bug debug/108843] timeout with -g -O3 ?

[rguenth at gcc dot gnu.org]

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

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2023-02-20
     Ever confirmed|0                           |1
           Keywords|                            |compile-time-hog,
                   |                            |needs-bisection

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Seems to be var-tracking, -fno-var-tracking is fast here.

[Bug debug/108843] timeout with -g -O3 ?

[marxin at gcc dot gnu.org]

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

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marxin at gcc dot gnu.org

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Created attachment 54517
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54517&action=edit
Partially reduced test-case

Started with r9-2635-g78ea9abc2018243a.

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

[marxin at gcc dot 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(); }

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

[dcb314 at hotmail dot com]

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

--- Comment #5 from David Binderman <dcb314 at hotmail dot com> ---
Created attachment 57711
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57711&action=edit
C source code

Another test case.

foundBugs $ (ulimit -t 60; time ~/gcc/results/bin/gcc -c -w -O3 bug1023.c)
real    0m0.456s
user    0m0.435s
sys     0m0.019s

foundBugs $ (ulimit -t 60; time ~/gcc/results/bin/gcc -c -w -g -O3 bug1023.c)
gcc: fatal error: Killed signal terminated program cc1
compilation terminated.
real    1m0.363s
user    0m59.555s
sys     0m0.524s

foundBugs $ (ulimit -t 60; time ~/gcc/results/bin/gcc -c -w -g -O3
-fno-var-tracking bug1023.c)
real    0m6.269s
user    0m5.620s
sys     0m0.502s
foundBugs $