[Bug target/104540] New: ICE: SIGSEGV in cfi_oprnd_equal_p with -O2 -fharden-conditional-branches -mforce-drap -mstackrealign --param=max-grow-copy-bb-insns=125

[Bug target/104540] New: ICE: SIGSEGV in cfi_oprnd_equal_p with -O2 -fharden-conditional-branches -mforce-drap -mstackrealign --param=max-grow-copy-bb-insns=125

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104540

            Bug ID: 104540
           Summary: ICE: SIGSEGV in cfi_oprnd_equal_p with -O2
                    -fharden-conditional-branches -mforce-drap
                    -mstackrealign --param=max-grow-copy-bb-insns=125
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          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 52442
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52442&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O2 -fharden-conditional-branches -mforce-drap
-mstackrealign --param=max-grow-copy-bb-insns=125 testcase.C 
during RTL pass: dwarf2
testcase.C: In function 'void foo()':
testcase.C:19:1: internal compiler error: Segmentation fault
   19 | }
      | ^
0x166367f crash_signal
        /repo/gcc-trunk/gcc/toplev.cc:322
0x11e1770 cfa_reg::operator==(cfa_reg const&) const
        /repo/gcc-trunk/gcc/dwarf2out.h:144
0x11e1770 cfa_equal_p(dw_cfa_location const*, dw_cfa_location const*)
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:765
0x11e1a99 cfi_row_equal_p
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:831
0x11e534a maybe_record_trace_start
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:2565
0x11e590b create_trace_edges
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:2679
0x11e5f16 scan_trace
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:2903
0x11e7303 create_cfi_notes
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:2930
0x11e7303 execute_dwarf2_frame
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:3301
0x11e7303 execute
        /repo/gcc-trunk/gcc/dwarf2cfi.cc:3789
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.

$ 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-r12-7228-20220214143106-g0a1a3afb5fb-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.1/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
--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-r12-7228-20220214143106-g0a1a3afb5fb-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.1 20220214 (experimental) (GCC)

[Bug middle-end/104540] ICE: SIGSEGV in cfi_oprnd_equal_p with -O2 -fharden-conditional-branches -mforce-drap -mstackrealign --param=max-grow-copy-bb-insns=125

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104540

Alexandre Oliva <aoliva at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-02-17
           Assignee|unassigned at gcc dot gnu.org      |aoliva at gcc dot gnu.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED

--- Comment #1 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Mine.  Confirmed.

[Bug middle-end/104540] ICE: SIGSEGV in cfi_oprnd_equal_p with -O2 -fharden-conditional-branches -mforce-drap -mstackrealign --param=max-grow-copy-bb-insns=125

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104540

--- Comment #2 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Created attachment 52459
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52459&action=edit
candidate patch under test

Here's a candidate fix

[Bug middle-end/104540] ICE: SIGSEGV in cfi_oprnd_equal_p with -O2 -fharden-conditional-branches -mforce-drap -mstackrealign --param=max-grow-copy-bb-insns=125

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104540

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

https://gcc.gnu.org/g:a026b67f8f70d6cf35daf42a4b0909f78c9d7f40

commit r12-7382-ga026b67f8f70d6cf35daf42a4b0909f78c9d7f40
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Thu Feb 24 22:03:34 2022 -0300

    Cope with NULL dw_cfi_cfa_loc

    In def_cfa_0, we may set the 2nd operand's dw_cfi_cfa_loc to NULL, but
    then cfi_oprnd_equal_p calls cfa_equal_p with a NULL dw_cfa_location*.
    This patch aranges for us to tolerate NULL dw_cfi_cfa_loc.


    for  gcc/ChangeLog

            PR middle-end/104540
            * dwarf2cfi.cc (cfi_oprnd_equal_p): Cope with NULL
            dw_cfi_cfa_loc.

    for  gcc/testsuite/ChangeLog

            PR middle-end/104540
            * g++.dg/pr104540.C: New.

[Bug middle-end/104540] ICE: SIGSEGV in cfi_oprnd_equal_p with -O2 -fharden-conditional-branches -mforce-drap -mstackrealign --param=max-grow-copy-bb-insns=125

[aoliva at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104540

Alexandre Oliva <aoliva at gcc dot gnu.org> changed:

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

--- Comment #4 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Fixed