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Date: Mon, 23 Feb 2009 16:01:00 -0000
Subject: [Bug c/39274]  New: internal compiler error: in check_cfg, at haifa-sched.c, var-tracking
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From: "sergei_lus at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>
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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