[Bug rtl-optimization/103834] New: ICE: qsort comparator non-negative on sorted output: 1 with custom flags

[Bug rtl-optimization/103834] New: ICE: qsort comparator non-negative on sorted output: 1 with custom flags

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103834

            Bug ID: 103834
           Summary: ICE: qsort comparator non-negative on sorted output: 1
                    with custom flags
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 52060
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52060&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -fno-guess-branch-probability
-fharden-conditional-branches -fno-sched-critical-path-heuristic -fno-peephole2
-fsched2-use-superblocks testcase.C 
testcase.C: In member function 'virtual void C::_ZThn8_N1C3fooEi(int)':
testcase.C:15:16: error: qsort comparator non-negative on sorted output: 1
   15 |   virtual void foo (int);
      |                ^~~
during RTL pass: sched2
testcase.C:15:16: internal compiler error: qsort checking failed
0xdd17db qsort_chk_error
        /repo/gcc-trunk/gcc/vec.c:204
0xdd18ed qsort_chk(void*, unsigned long, unsigned long, int (*)(void const*,
void const*, void*), void*)
        /repo/gcc-trunk/gcc/vec.c:246
0x27f18d5 gcc_qsort(void*, unsigned long, unsigned long, int (*)(void const*,
void const*))
        /repo/gcc-trunk/gcc/sort.cc:270
0x2605888 ready_sort_real
        /repo/gcc-trunk/gcc/haifa-sched.c:3095
0x260dfb4 ready_sort
        /repo/gcc-trunk/gcc/haifa-sched.c:3111
0x260dfb4 schedule_block(basic_block_def**, void*)
        /repo/gcc-trunk/gcc/haifa-sched.c:6718
0x26e5f1b schedule_ebb(rtx_insn*, rtx_insn*, bool)
        /repo/gcc-trunk/gcc/sched-ebb.c:536
0x26e6642 schedule_ebbs()
        /repo/gcc-trunk/gcc/sched-ebb.c:655
0x15faf6c rest_of_handle_sched2
        /repo/gcc-trunk/gcc/sched-rgn.c:3740
0x15faf6c execute
        /repo/gcc-trunk/gcc/sched-rgn.c:3878
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-6113-20211224170936-g8f921393e33-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --with-cloog --with-ppl --with-isl
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-r12-6113-20211224170936-g8f921393e33-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20211224 (experimental) (GCC)

[Bug rtl-optimization/103834] ICE: qsort comparator non-negative on sorted output: 1 with custom flags

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103834

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
                 CC|                            |aoliva at gcc dot gnu.org,
                   |                            |marxin at gcc dot gnu.org
   Last reconfirmed|                            |2021-12-28
     Ever confirmed|0                           |1

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with introduction of -fharden-conditional-branches.

[Bug rtl-optimization/103834] ICE: qsort comparator non-negative on sorted output: 1 with custom flags

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103834

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

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

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 84345.

*** This bug has been marked as a duplicate of bug 84345 ***