[Bug tree-optimization/59386] New: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu in 64-bit mode

[Bug tree-optimization/59386] New: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu in 64-bit mode

[su at cs dot ucdavis.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59386

            Bug ID: 59386
           Summary: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu
                    in 64-bit mode
           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
-O2 and -O3 on x86_64-linux-gnu in 64-bit mode (but not in 32-bit mode). 

It 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 --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 4.9.0 20131204 (experimental) [trunk revision 205660] (GCC) 
$ 
$ gcc-trunk -m64 -Os -c small.c       
$ gcc-4.8 -m64 -O2 -c small.c
$ gcc-trunk -m32 -O2 -c small.c
$ 
$ gcc-trunk -m64 -O2 -c small.c
small.c: In function ‘fn2’:
small.c:31:1: error: incorrect sharing of tree nodes
 }
 ^
a.f2
# .MEM_11 = VDEF <.MEM_10>
a.f2 = D.1782;
small.c:31:1: internal compiler error: verify_gimple failed
0x9d3821 verify_gimple_in_cfg(function*)
    ../../gcc-trunk/gcc/tree-cfg.c:4848
0x8fa874 execute_function_todo
    ../../gcc-trunk/gcc/passes.c:1843
0x8fb273 execute_todo
    ../../gcc-trunk/gcc/passes.c:1877
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.
$ 


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


struct S0
{
  int f0;
};

struct S1
{
  int f1;
  struct S0 f2;
} c;

int b;

struct S0
fn1 ()
{
  struct S1 d;
  if (b) 
    for (; c.f1;)
      ;
  else
    return d.f2; 
}

struct S0
fn2 ()
{
  struct S1 a;
  a.f2 = fn1 ();
  return a.f2; 
}
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Subject: [Bug c++/59268] [4.7/4.8/4.9 Regression] [c++11] ICE with constexpr in a virtual function
Date: Wed, 04 Dec 2013 18:02:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY268

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Dec  4 18:00:28 2013
New Revision: 205674

URL: http://gcc.gnu.org/viewcvs?rev 5674&root=gcc&view=rev
Log:
    PR c++/59268
    * pt.c (tsubst_copy_and_build): Handle POINTER_PLUS_EXPR.

    * g++.dg/cpp0x/constexpr-template6.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-template6.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/pt.c
    trunk/gcc/testsuite/ChangeLog

[Bug tree-optimization/59386] [4.9 Regression] ICE on valid code at -O2 and -O3 on x86_64-linux-gnu in 64-bit mode

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59386

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-12-04
                 CC|                            |mpolacek at gcc dot gnu.org
      Known to work|                            |4.8.2
   Target Milestone|---                         |4.9.0
            Summary|ICE on valid code at -O2    |[4.9 Regression] ICE on
                   |and -O3 on x86_64-linux-gnu |valid code at -O2 and -O3
                   |in 64-bit mode              |on x86_64-linux-gnu in
                   |                            |64-bit mode
     Ever confirmed|0                           |1
      Known to fail|                            |4.9.0

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.

[Bug tree-optimization/59386] [4.9 Regression] ICE on valid code at -O2 and -O3 on x86_64-linux-gnu in 64-bit mode

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59386

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

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

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 31411
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31411&action=edit
gcc49-pr59386.patch

Untested fix.

[Bug tree-optimization/59386] [4.9 Regression] ICE on valid code at -O2 and -O3 on x86_64-linux-gnu in 64-bit mode

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59386

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Dec 11 09:18:33 2013
New Revision: 205883

URL: http://gcc.gnu.org/viewcvs?rev=205883&root=gcc&view=rev
Log:
    PR tree-optimization/59386
    * tree-inline.c (remap_gimple_stmt): If not id->do_not_unshare,
    unshare_expr (id->retval) before passing it to gimple_build_assign.

    * gcc.c-torture/compile/pr59386.c: New test.

Added:
    trunk/gcc/testsuite/gcc.c-torture/compile/pr59386.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-inline.c

[Bug tree-optimization/59386] [4.9 Regression] ICE on valid code at -O2 and -O3 on x86_64-linux-gnu in 64-bit mode

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59386

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

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

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed.