[Bug c++/112712] New: Crash when compiling g++ -m68020-60 -O2

[Bug c++/112712] New: Crash when compiling g++ -m68020-60 -O2

[miro.kropacek at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112712

            Bug ID: 112712
           Summary: Crash when compiling g++ -m68020-60 -O2
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: miro.kropacek at gmail dot com
  Target Milestone: ---

Created attachment 56688
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=56688&action=edit
Preprocessed output

This is a crash which seems to be specific to the -m68020-60 option (or better
said to 060 code generation as the only other option where this bugs occurs is
-m68060). When changing to any other CPU (-m68000, -mcpu=5475, ...) and/or
changing to -O1, -O0, ... everything is fine.

See the attached preprocessed file which triggers the bug:

m68k-elf-g++ -c -g -O2 -m68020-60 -fomit-frame-pointer -funsigned-char
-std=gnu++20 -fvisibility=hidden -Wno-sign-compare crash.cpp

similar/main/multi.cpp:6167:1: internal compiler error: in push_reload, at
reload.cc:1124
 6167 | }
      | ^
0x15fee77 diagnostic_impl(rich_location*, diagnostic_metadata const*, int, char
const*, __va_list_tag (*) [1], diagnostic_t)
        ???:0
0x15ffd3c internal_error(char const*, ...)
        ???:0
0x5e9465 fancy_abort(char const*, int, char const*)
        ???:0
0x5c9a9d push_reload(rtx_def*, rtx_def*, rtx_def**, rtx_def**, reg_class,
machine_mode, machine_mode, int, int, int, reload_type) [clone .cold]
        ???:0
0xca2ffb find_reloads(rtx_insn*, int, int, int, short*)
        ???:0
0xcb0dcb reload(rtx_insn*, int)
        ???:0
0xb4657a (anonymous namespace)::pass_reload::execute(function*)
        ???:0
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.

[Bug target/112712] Crash when compiling g++ -m68020-60 -O2

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112712

Mikael Pettersson <mikpelinux at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikpelinux at gmail dot com

--- Comment #1 from Mikael Pettersson <mikpelinux at gmail dot com> ---
I can reproduce with a gcc-13.2 cross to m68k-elf w/ c++:

during RTL pass: reload
similar/main/multi.cpp: In function 'void d1x::multi_object_to_object_rw(const
object&, object_rw*)':
similar/main/multi.cpp:6167:1: internal compiler error: in push_reload, at
reload.cc:1124
0x422a9d push_reload(rtx_def*, rtx_def*, rtx_def**, rtx_def**, reg_class,
machine_mode, machine_mode, int, int, int, reload_type)
        /mnt/scratch/cross/downloads/gcc-mirror-gcc.git/gcc/reload.cc:1124
0xabcda1 find_reloads(rtx_insn*, int, int, int, short*)
        /mnt/scratch/cross/downloads/gcc-mirror-gcc.git/gcc/reload.cc:4049
0xaca6ea calculate_needs_all_insns
        /mnt/scratch/cross/downloads/gcc-mirror-gcc.git/gcc/reload1.cc:1469
0xaca6ea reload(rtx_insn*, int)
        /mnt/scratch/cross/downloads/gcc-mirror-gcc.git/gcc/reload1.cc:983
0x96f784 do_reload
        /mnt/scratch/cross/downloads/gcc-mirror-gcc.git/gcc/ira.cc:5975
0x96f784 execute
        /mnt/scratch/cross/downloads/gcc-mirror-gcc.git/gcc/ira.cc:6149

The given test case doesn't compile with older g++ versions so I can't bisect.

[Bug target/112712] Crash when compiling g++ -m68020-60 -O2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112712

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2023-11-27
           Keywords|                            |ice-on-valid-code, ra
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

[Bug target/112712] Crash when compiling g++ -m68020-60 -O2

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112712

--- Comment #2 from Mikael Pettersson <mikpelinux at gmail dot com> ---
It appears the test case comes from https://github.com/dxx-rebirth/dxx-rebirth/
(a port of the old Descent game engine).