[Bug tree-optimization/58522] New: ICE with segfault at -O3 on x86_64-linux-gnu

[Bug tree-optimization/58522] New: ICE with segfault at -O3 on x86_64-linux-gnu

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58522

            Bug ID: 58522
           Summary: ICE with segfault 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

The following code causes an ICE when compiled with the current gcc trunk at
-O3 on x86_64-linux in both 32-bit and 64-bit modes. 

This is a regression from 4.8.x. 


$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure
--enable-languages=c,c++,objc,obj-c++,fortran,lto --enable-checking=release
--with-gmp=/usr/local/gcc-trunk --with-mpfr=/usr/local/gcc-trunk
--with-mpc=/usr/local/gcc-trunk --with-cloog=/usr/local/gcc-trunk
--prefix=/usr/local/gcc-trunk
Thread model: posix
gcc version 4.9.0 20130924 (experimental) [trunk revision 202859] (GCC) 
$ 
$ gcc-trunk -O2 small.c   
$ gcc-4.8 -O3 small.c  
$ gcc-trunk -O3 small.c
small.c: In function ‘main’:
small.c:13:1: internal compiler error: Segmentation fault
 main ()
 ^
0x8108ef crash_signal
    ../../gcc-trunk/gcc/toplev.c:335
0x83b957 ssa_default_def(function*, tree_node*)
    ../../gcc-trunk/gcc/tree-dfa.c:310
0x83bcc0 get_or_create_ssa_default_def(function*, tree_node*)
    ../../gcc-trunk/gcc/tree-dfa.c:362
0x8569ec get_reaching_def
    ../../gcc-trunk/gcc/tree-into-ssa.c:1184
0x85ca82 maybe_replace_use
    ../../gcc-trunk/gcc/tree-into-ssa.c:1791
0x85ca82 rewrite_update_stmt
    ../../gcc-trunk/gcc/tree-into-ssa.c:1974
0x85ca82 rewrite_update_dom_walker::before_dom_children(basic_block_def*)
    ../../gcc-trunk/gcc/tree-into-ssa.c:2150
0xb99ed7 dom_walker::walk(basic_block_def*)
    ../../gcc-trunk/gcc/domwalk.c:176
0x85560c rewrite_blocks
    ../../gcc-trunk/gcc/tree-into-ssa.c:2209
0x85bce6 update_ssa(unsigned int)
    ../../gcc-trunk/gcc/tree-into-ssa.c:3294
0x9826bd insert_range_assertions
    ../../gcc-trunk/gcc/tree-vrp.c:6103
0x9826bd execute_vrp
    ../../gcc-trunk/gcc/tree-vrp.c:9572
0x9826bd execute
    ../../gcc-trunk/gcc/tree-vrp.c:9673
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.
$ 



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


static int a, b;
char *c;
short *d, e;
int f;

short
foo (int p1, int p2)
{
  return p2 >= 0 || p1 > 1 >> p2 ? p1 : p1 << p2;
}

int
main ()
{
  int *g = &f, h;

  for (b = 4; b; b--)
    {
      for (a = 0; a < 5; a++)
        {
      e = foo (h != 0, *d);
      *g |= e;
      *d = 0;
        }
      *c = 0;
    }

  return 0;
}
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From: "schaub.johannes at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/36587] Feature: add warning for constructor call with discarded return.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id6587

Johannes Schaub <schaub.johannes at googlemail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |schaub.johannes@googlemail.
                   |                            |com

--- Comment #7 from Johannes Schaub <schaub.johannes at googlemail dot com> ---
(In reply to Jonathan Wakely from comment #3)
> This would have prevented bugs I've dealt with where critical sections where
> not protected:
> {
>   lock_guard (mutex);
>   // mutex NOT locked here!
> }
>

Jonathan, unfortunately that code won't create and discard a temporary object,
so I am not sure whether this patch would have caught the mistake of creating a
default constructed lock_guard (whatever that means).

[Bug tree-optimization/58522] [4.9 Regression] ICE with segfault at -O3 on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58522

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |4.9.0
            Summary|ICE with segfault at -O3 on |[4.9 Regression] ICE with
                   |x86_64-linux-gnu            |segfault at -O3 on
                   |                            |x86_64-linux-gnu

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r199048, so sounds like one of the many dups of the reassoc
scheduling bugs.

[Bug tree-optimization/58522] [4.9 Regression] ICE with segfault at -O3 on x86_64-linux-gnu

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58522

--- Comment #2 from Zhendong Su <su at cs dot ucdavis.edu> ---
(In reply to Jakub Jelinek from comment #1)
> Started with r199048, so sounds like one of the many dups of the reassoc
> scheduling bugs.

Jakub, I think you are right. I somehow forgot to check it against the proposed
patch for 57393, which makes this ICE disappear.

[Bug tree-optimization/58522] [4.9 Regression] ICE with segfault at -O3 on x86_64-linux-gnu

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58522

Zhendong Su <su at cs dot ucdavis.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #3 from Zhendong Su <su at cs dot ucdavis.edu> ---
Dup.

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