[Bug tree-optimization/114948] New: ICE on valid code at -O3 with "-fno-tree-ccp -fno-tree-ch" on x86_64-linux-gnu: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:647

[Bug tree-optimization/114948] New: ICE on valid code at -O3 with "-fno-tree-ccp -fno-tree-ch" on x86_64-linux-gnu: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:647

[zhendong.su at inf dot ethz.ch]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114948

            Bug ID: 114948
           Summary: ICE on valid code at -O3 with "-fno-tree-ccp
                    -fno-tree-ch" on x86_64-linux-gnu: in
                    check_loop_closed_ssa_def, at
                    tree-ssa-loop-manip.cc:647
           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 as it doesn't reproduce with 13.2 and
earlier.

Compiler Explorer: https://godbolt.org/z/szY6nz1W3

[522] % 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/15.0.0/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
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240505 (experimental) (GCC) 
[523] % 
[523] % gcctk -O3 -fno-tree-ccp -fno-tree-ch small.c
during GIMPLE pass: cunroll
small.c: In function ‘main’:
small.c:2:5: internal compiler error: in check_loop_closed_ssa_def, at
tree-ssa-loop-manip.cc:647
    2 | int main() {
      |     ^~~~
0x89471d check_loop_closed_ssa_def
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:647
0x130e654 check_loop_closed_ssa_bb
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:661
0x131023e verify_loop_closed_ssa(bool, loop*)
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:697
0x131023e verify_loop_closed_ssa(bool, loop*)
        ../../gcc-trunk/gcc/tree-ssa-loop-manip.cc:681
0x12f54fe tree_unroll_loops_completely
        ../../gcc-trunk/gcc/tree-ssa-loop-ivcanon.cc:1569
0x12f5583 execute
        ../../gcc-trunk/gcc/tree-ssa-loop-ivcanon.cc:1673
0x12f5583 execute
        ../../gcc-trunk/gcc/tree-ssa-loop-ivcanon.cc:1663
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.
[524] % 
[524] % cat small.c
int a, b, c, d;
int main() {
  int *e = 0;
  for (; d; d++)
  L1:
    ;
 L2:
   if (a) {
     for (c = 0; c < 2; ++c) {
       int *h;
       int **i = &h;
       int **const *j = &i;
       int **const **k = &j;
       if (c) {
         if (b)
           goto L2;
         a = *e;
       }
     }
     goto L1;
   }
 return 0;
}

[Bug tree-optimization/114948] [14/15 Regression] ICE on valid code at -O3 with "-fno-tree-ccp -fno-tree-ch" on x86_64-linux-gnu: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:647

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114948

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|ICE on valid code at -O3    |[14/15 Regression] ICE on
                   |with "-fno-tree-ccp         |valid code at -O3 with
                   |-fno-tree-ch" on            |"-fno-tree-ccp
                   |x86_64-linux-gnu: in        |-fno-tree-ch" on
                   |check_loop_closed_ssa_def,  |x86_64-linux-gnu: in
                   |at                          |check_loop_closed_ssa_def,
                   |tree-ssa-loop-manip.cc:647  |at
                   |                            |tree-ssa-loop-manip.cc:647
           Keywords|                            |ice-checking
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-05-05
   Target Milestone|---                         |14.0
             Status|UNCONFIRMED                 |NEW

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

[Bug tree-optimization/114948] [14/15 Regression] ICE on valid code at -O3 with "-fno-tree-ccp -fno-tree-ch" on x86_64-linux-gnu: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:647

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114948

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64-*-*
                 CC|                            |rguenth at gcc dot gnu.org

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
I can't reproduce on the 14 branch head (with checking enabled).

[Bug tree-optimization/114948] [15 Regression] ICE on valid code at -O3 with "-fno-tree-ccp -fno-tree-ch" on x86_64-linux-gnu: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:647

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114948

Sam James <sjames at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sjames at gcc dot gnu.org
            Summary|[14/15 Regression] ICE on   |[15 Regression] ICE on
                   |valid code at -O3 with      |valid code at -O3 with
                   |"-fno-tree-ccp              |"-fno-tree-ccp
                   |-fno-tree-ch" on            |-fno-tree-ch" on
                   |x86_64-linux-gnu: in        |x86_64-linux-gnu: in
                   |check_loop_closed_ssa_def,  |check_loop_closed_ssa_def,
                   |at                          |at
                   |tree-ssa-loop-manip.cc:647  |tree-ssa-loop-manip.cc:647

--- Comment #3 from Sam James <sjames at gcc dot gnu.org> ---
Nor me, just trunk..

[Bug tree-optimization/114948] [15 Regression] ICE on valid code at -O3 with "-fno-tree-ccp -fno-tree-ch" on x86_64-linux-gnu: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:647

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114948

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|14.0                        |14.2

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
GCC 14.1 is being released, retargeting bugs to GCC 14.2.

[Bug tree-optimization/114948] [15 Regression] ICE on valid code at -O3 with "-fno-tree-ccp -fno-tree-ch" on x86_64-linux-gnu: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:647

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114948

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
can't reproduce on trunk either ... the godbold link is also fine.