[Bug tree-optimization/57718] New: ICE in execute_todo, passes.c:2002 at -O3 (both -m32 & -m64)

[Bug tree-optimization/57718] New: ICE in execute_todo, passes.c:2002 at -O3 (both -m32 & -m64)

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57718

            Bug ID: 57718
           Summary: ICE in execute_todo, passes.c:2002 at -O3 (both -m32 &
                    -m64)
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

With current gcc trunk on x86_64-linux, the following code causes an ICE when
compiled at -O3 (both -m32 and -m64). This is a regression from 4.8.x. 

It may be related to 57592. 

$ gcc-trunk -v
gcc version 4.9.0 20130625 (experimental) [trunk revision 200388] (GCC) 
$ gcc-trunk -O2 -c reduced.c
$ gcc-4.8 -O3 -c reduced.c
$ gcc-trunk -O3 -c reduced.c
reduced.c: In function ‘foo’:
reduced.c:3:6: internal compiler error: Segmentation fault
 void foo ()
      ^
0x7d729f crash_signal
    ../../gcc-trunk/gcc/toplev.c:333
0x7ff31b ssa_default_def(function*, tree_node*)
    ../../gcc-trunk/gcc/tree-dfa.c:314
0x7ff5e0 get_or_create_ssa_default_def(function*, tree_node*)
    ../../gcc-trunk/gcc/tree-dfa.c:362
0x8187fa get_reaching_def
    ../../gcc-trunk/gcc/tree-into-ssa.c:1184
0x81e96b maybe_replace_use
    ../../gcc-trunk/gcc/tree-into-ssa.c:1784
0x81e96b rewrite_update_stmt
    ../../gcc-trunk/gcc/tree-into-ssa.c:1967
0x81e96b rewrite_update_enter_block
    ../../gcc-trunk/gcc/tree-into-ssa.c:2136
0xb3801a walk_dominator_tree(dom_walk_data*, basic_block_def*)
    ../../gcc-trunk/gcc/domwalk.c:210
0x817503 rewrite_blocks
    ../../gcc-trunk/gcc/tree-into-ssa.c:2216
0x81dc1e update_ssa(unsigned int)
    ../../gcc-trunk/gcc/tree-into-ssa.c:3303
0x74a3db execute_function_todo
    ../../gcc-trunk/gcc/passes.c:1942
0x74ab7e execute_todo
    ../../gcc-trunk/gcc/passes.c:2002
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

----------------------------------------------------------

int a, b, c, d, e, f;

void foo ()
{
  int g;
  for (;;) {
    f = 0;
    for (; f <= 1; f++) {
      a = 0;
      for (; a <= 4; a++)
    b |= a >= g;
      if (d)
    continue;
      e = 0;
    }
    c = bar () < b;
  }
}
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From: "su at cs dot ucdavis.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/57719] New: wrong code at -O3 on x86_64-linux-gnu
Date: Wed, 26 Jun 2013 06:37:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idW719

            Bug ID: 57719
           Summary: wrong code at -O3 on x86_64-linux-gnu
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu

Current gcc trunk (and gcc-4.8) produces wrong code for the following testcase
on x86_64-linux when compiled at -O3 in both 32-bit and 64-bit modes. This is a
regression from 4.7.x.

$ gcc-trunk -v
gcc version 4.9.0 20130625 (experimental) [trunk revision 200388] (GCC)
$ gcc-trunk -O2 reduced.c
$ a.out
1
$ gcc-4.7 -O3 reduced.c
$ a.out
1
$ gcc-4.8 -O3 reduced.c
$ a.out
0
$ gcc-trunk -O3 reduced.c
$ a.out
0

-----------------------------------------------------------------

int printf (const char *, ...);

int u;

int a, b, c[2], d, *e, f, g;

int fn2 ()
{
  int t[1];
  int i;
  i = 0;
  for (; i < 1; i++)
    t[i] = 0;
  for (d = 0; d; d = 1) {
    int *s[1] = {&t[0]};
    g = a = *s[0];
  }
  f = g;
  return 1;
}

void fn1 ()
{
  for (; b < 2; b++) {
    int *p = &u;
    *p = 0;
    *p = fn2();
    e = &c[b];
    *e = 0;
  }
}

int
main ()
{
  fn1 ();
  printf ("%d\n", u);
  return 0;
}

[Bug tree-optimization/57718] [4.9 Regression] ICE in execute_todo, passes.c:2002 at -O3 (both -m32 & -m64)

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57718

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |jakub at gcc dot gnu.org
         Resolution|---                         |DUPLICATE
   Target Milestone|---                         |4.9.0
            Summary|ICE in execute_todo,        |[4.9 Regression] ICE in
                   |passes.c:2002 at -O3 (both  |execute_todo, passes.c:2002
                   |-m32 & -m64)                |at -O3 (both -m32 & -m64)

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Dup.

*** This bug has been marked as a duplicate of bug 57393 ***