[Bug tree-optimization/66349] New: ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195

[Bug tree-optimization/66349] New: ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195

[su at cs dot ucdavis.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66349

            Bug ID: 66349
           Summary: ICE on valid code at -O1, -O2 and -O3 on
                    x86_64-linux-gnu in dfs_enumerate_from, at
                    cfganal.c:1195
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: su at cs dot ucdavis.edu
  Target Milestone: ---

The following code causes an ICE when compiled with the current gcc trunk at
-O1, -O2 and -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes. 

It is a regression from 5.1.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/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20150530 (experimental) [trunk revision 223885] (GCC) 
$ 
$ gcc-trunk -O0 -c small.c
$ gcc-trunk -Os -c small.c
$ gcc-5.1 -O1 -c small.c
$ 
$ gcc-trunk -O1 -c small.c
small.c: In function ‘fn1’:
small.c:5:1: internal compiler error: in dfs_enumerate_from, at cfganal.c:1195
 fn1 ()
 ^
0x6d8a09 dfs_enumerate_from(basic_block_def*, int, bool (*)(basic_block_def
const*, void const*), basic_block_def**, int, void const*)
        ../../gcc-trunk/gcc/cfganal.c:1195
0xcd02e5 determine_bb_domination_status
        ../../gcc-trunk/gcc/tree-ssa-threadupdate.c:1768
0xcd02e5 thread_through_loop_header
        ../../gcc-trunk/gcc/tree-ssa-threadupdate.c:1953
0xcd253a thread_through_all_blocks(bool)
        ../../gcc-trunk/gcc/tree-ssa-threadupdate.c:2667
0xc1354b execute
        ../../gcc-trunk/gcc/tree-ssa-dom.c:1244
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.
$ 


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


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

void
fn1 ()
{
  for (; b; b++)
    {
      for (e = 0; e < 1; e++)
        ;
      int i = -1, j = 1;
      if (f)
        {
          for (; a < 1; a++)
            ;
          i++;
          j = 0;
        }
      for (; d; d++)
        {
          if (j)
            for (;; c++)
              ;
          if (i)
            continue;
          return;
        }
    }
}
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From: "vgheorgh at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/66350] New: typename should be forbidden in inhering constructors
Date: Sun, 31 May 2015 05:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idf350

            Bug ID: 66350
           Summary: typename should be forbidden in inhering constructors
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vgheorgh at gmail dot com
  Target Milestone: ---

The code below

#include <memory>

template <class T, class Deleter = std::default_delete<T>>
class unique_ptr_wrapper: public std::unique_ptr<T, Deleter>
{
public:
    using typename std::unique_ptr<T, Deleter>::unique_ptr; // typename should
be forbidden here
};

int main()
{
    unique_ptr_wrapper<int> upw{new int{42}};
}

should be ill formed (no typename required), since we inherit a constructor,
which is not a dependent type. IMO, a diagnostic should be required, however
g++ compiles the program without any warnings.

Tested with gcc4.9/5.1/6 HEAD.

More details: http://stackoverflow.com/q/30554119/3093378

[Bug tree-optimization/66349] ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66349

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Mine.

[Bug tree-optimization/66349] ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66349

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Patch reverted.

[Bug tree-optimization/66349] ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66349

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Jun  1 13:58:50 2015
New Revision: 223980

URL: https://gcc.gnu.org/viewcvs?rev=223980&root=gcc&view=rev
Log:
2015-06-01  Richard Biener  <rguenther@suse.de>

        PR tree-optimization/66349
        PR tree-optimization/66352
        PR tree-optimization/66357
        * gcc.dg/torture/pr66357.c: New testcase.
        * gcc.dg/torture/pr66349.c: Likewise.
        * gfortran.fortran-torture/compile/pr66352.f90: Likewise.

Added:
    trunk/gcc/testsuite/gcc.dg/torture/pr66349.c
    trunk/gcc/testsuite/gcc.dg/torture/pr66357.c
    trunk/gcc/testsuite/gfortran.fortran-torture/compile/pr66352.f90
Modified:
    trunk/gcc/testsuite/ChangeLog

[Bug tree-optimization/66349] ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66349
Bug 66349 depends on bug 66340, which changed state.

Bug 66340 Summary: [6 Regression] profiledbootstrap failure on x86-64 with LTO
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66340

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

[Bug tree-optimization/66349] ICE on valid code at -O1, -O2 and -O3 on x86_64-linux-gnu in dfs_enumerate_from, at cfganal.c:1195

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66349

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dcb314 at hotmail dot com

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
*** Bug 66381 has been marked as a duplicate of this bug. ***