[Bug c/39274] New: internal compiler error: in check_cfg, at haifa-sched.c, var-tracking

[Bug c/39274] New: internal compiler error: in check_cfg, at haifa-sched.c, var-tracking

[sergei_lus at yahoo dot com]

This simple code: 

typedef void (*TestFunction)(int *);

void Add(int *testCase);
void test(void);
int* TestNew( TestFunction function);

static void foo(int* tc){
   test();
}

int* GetProfileSuite(){
   Add(TestNew(foo));
   return 0;
}

...triggers internal assert on my port of 4.3.2 when compiled with -O2 -g. It
will pass with -O2 only or with -O2 -fno-var-tracking -g. 

The assert triggered is this one:

...
static void
check_cfg (rtx head, rtx tail)
{
...
if (control_flow_insn_p (head))
   {
      gcc_assert (BB_END (bb) == head); <<<<<< This one 

      if (any_uncondjump_p (head))
          gcc_assert (EDGE_COUNT (bb->succs) == 1
                 && BARRIER_P (NEXT_INSN (head)));

It looks like free_cfg pass removes something it should not after
NOTE_INSN_VAR_LOCATION was inserted by variable_tracking pass.


-- 
           Summary: internal compiler error: in check_cfg, at haifa-sched.c,
                    var-tracking
           Product: gcc
           Version: 4.3.2
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sergei_lus at yahoo dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39274

[Bug middle-end/39274] internal compiler error: in check_cfg, at haifa-sched.c, var-tracking

[pinskia at gcc dot gnu dot org]

------- Comment #1 from pinskia at gcc dot gnu dot org  2009-02-24 22:33 -------
>It looks like free_cfg pass removes something it should not after
> NOTE_INSN_VAR_LOCATION was inserted by variable_tracking pass.


Are you running the scheduler manually in your machine dependent reorg?  If so
you need to call compute_bb_for_insn before calling schedule_insns.


-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |normal
             Status|UNCONFIRMED                 |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39274

[Bug middle-end/39274] internal compiler error: in check_cfg, at haifa-sched.c, var-tracking

[sergei_lus at yahoo dot com]

------- Comment #2 from sergei_lus at yahoo dot com  2009-02-25 17:00 -------

Thank you for the suggestion, but... 

I use schedule_ebbs in machine dependent reorg, and I do call
compute_bb_for_insn before it. CFG is messed up before I get there... 


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39274

[Bug middle-end/39274] internal compiler error: in check_cfg, at haifa-sched.c, var-tracking

[steven at gcc dot gnu dot org]

------- Comment #3 from steven at gcc dot gnu dot org  2010-07-21 09:58 -------
Look at the ia64 port (and a few others too, e.g. blackfin), they call
compute_bb_for_insn first thing in machine reorg and that works. It is
obviously not ideal, but the only pass between free_cfg and machine_reorg that
can destroy  the CFG is dbr_sched (delay branch scheduling).

Anyway, out-of-tree port => INVALID.

Feel free to re-open this bug report if you can reproduce it with an in-tree
port, of course.


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39274