[Bug tree-optimization/107935] New: ICE on valid code at -O3: in set_ssa_val_to, at tree-ssa-sccvn.cc:5011

[Bug tree-optimization/107935] New: ICE on valid code at -O3: in set_ssa_val_to, at tree-ssa-sccvn.cc:5011

[zhendong.su at inf dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107935

            Bug ID: 107935
           Summary: ICE on valid code at -O3: in set_ssa_val_to, at
                    tree-ssa-sccvn.cc:5011
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

It appears to be a recent regression from 12.2. 

Compiler Explorer: https://godbolt.org/z/dcTPb13on

[550] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/13.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib
--with-system-zlib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 13.0.0 20221130 (experimental) [master r13-4400-g84046b192e5] (GCC) 
[551] % 
[551] % gcctk -O2 small.c; ./a.out
[552] % 
[552] % gcctk -O3 small.c
during GIMPLE pass: fre
small.c: In function ‘main’:
small.c:2:5: internal compiler error: in set_ssa_val_to, at
tree-ssa-sccvn.cc:5011
    2 | int main() {
      |     ^~~~
0x7773f7 set_ssa_val_to
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:5011
0x10b0358 visit_phi
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:5962
0x10bbd8a process_bb
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:7721
0x10bd6b2 do_rpo_vn_1
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:8417
0x10beef6 execute
        ../../gcc-trunk/gcc/tree-ssa-sccvn.cc:8575
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[553] % 
[553] % cat small.c
int *a, **b;
int main() {
  int d = 0, *e = &d;
 L:
  *e = d;
  if (a) {
    int *g = e = *b;
    if (!e)
      __builtin_abort();
    if (**b)
      return 0;
    *g = 1;
    goto L;
  }
  return 0;
}

[Bug tree-optimization/107935] [13 Regression] ICE on valid code at -O3: in set_ssa_val_to, at tree-ssa-sccvn.cc:5011

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107935

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
            Version|unknown                     |13.0
   Target Milestone|---                         |13.0
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-11-30
           Keywords|                            |ice-on-valid-code
            Summary|ICE on valid code at -O3:   |[13 Regression] ICE on
                   |in set_ssa_val_to, at       |valid code at -O3: in
                   |tree-ssa-sccvn.cc:5011      |set_ssa_val_to, at
                   |                            |tree-ssa-sccvn.cc:5011

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

[Bug tree-optimization/107935] [13 Regression] ICE on valid code at -O3: in set_ssa_val_to, at tree-ssa-sccvn.cc:5011

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107935

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/107935] [13 Regression] ICE on valid code at -O3: in set_ssa_val_to, at tree-ssa-sccvn.cc:5011

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107935

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:8629f212af0acb113879d0bc45291c54743790f1

commit r13-4436-g8629f212af0acb113879d0bc45291c54743790f1
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Dec 1 09:01:20 2022 +0100

    tree-optimization/107935 - fixup equivalence handling in PHI VN

    The following makes sure to honor the backedge processing logic
    that forces VARYING there.

            PR tree-optimization/107935
            * tree-ssa-sccvn.cc (visit_phi): Honor forced VARYING on
            backedges.

            * gcc.dg/torture/pr107935.c: New testcase.

[Bug tree-optimization/107935] [13 Regression] ICE on valid code at -O3: in set_ssa_val_to, at tree-ssa-sccvn.cc:5011

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107935

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

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

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.