[Bug c++/108086] New: internal compiler error: in set_accesses, at rtl-ssa/internals.inl:449

[jonas.keller@uni-bielefeld.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108086

            Bug ID: 108086
           Summary: internal compiler error: in set_accesses, at
                    rtl-ssa/internals.inl:449
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jonas.keller@uni-bielefeld.de
  Target Milestone: ---

gcc Version: 12.2.0, as well as at least 5.1 until 7.4

command line that triggers the bug:
g++ -v -save-temps -freport-bug -mavx512f -O1 main.cpp

The bug also occurs with -O2 and -O3 but not with -O0.
It also does not seem to be dependend on a specific architecture, as long as
the architecture has avx512f, as the code depends on that.

The bug is present at least since gcc 5.1, as tested in compiler explorer.
I couldn't test it with newer versions than gcc 7.4, since the compilation
takes too long and is killed by compiler explorer.

The following output is generated by gcc:

Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-bootstrap
--prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man
--infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/
--with-build-config=bootstrap-lto --with-linker-hash-style=gnu
--with-system-zlib --enable-__cxa_atexit --enable-cet=auto
--enable-checking=release --enable-clocale=gnu --enable-default-pie
--enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object
--enable-libstdcxx-backtrace --enable-link-serialization=1
--enable-linker-build-id --enable-lto --enable-multilib --enable-plugin
--enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch
--disable-werror
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-freport-bug' '-mavx512f' '-O1'
'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' 'a-'
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/cc1plus -E -quiet -v -D_GNU_SOURCE
main.cpp -mavx512f -mtune=generic -march=x86-64 -freport-bug -O1
-fpch-preprocess -o a-main.ii
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0

/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/x86_64-pc-linux-gnu

/usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/backward
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/include
 /usr/local/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-freport-bug' '-mavx512f' '-O1'
'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' 'a-'
 /usr/lib/gcc/x86_64-pc-linux-gnu/12.2.0/cc1plus -fpreprocessed a-main.ii
-quiet -dumpdir a- -dumpbase main.cpp -dumpbase-ext .cpp -mavx512f
-mtune=generic -march=x86-64 -O1 -version -freport-bug -o a-main.s
GNU C++17 (GCC) version 12.2.0 (x86_64-pc-linux-gnu)
        compiled by GNU C version 12.2.0, GMP version 6.2.1, MPFR version
4.1.0-p13, MPC version 1.2.1, isl version isl-0.25-GMP

warning: MPFR header version 4.1.0-p13 differs from library version 4.1.1-p1.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++17 (GCC) version 12.2.0 (x86_64-pc-linux-gnu)
        compiled by GNU C version 12.2.0, GMP version 6.2.1, MPFR version
4.1.0-p13, MPC version 1.2.1, isl version isl-0.25-GMP

warning: MPFR header version 4.1.0-p13 differs from library version 4.1.1-p1.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 402ce889a414e2a3abbbe3146fa0a6cb
during RTL pass: fwprop1
main.cpp: In function ‘int main()’:
main.cpp:230:1: internal compiler error: in set_accesses, at
rtl-ssa/internals.inl:449
  230 | }
      | ^
0x19eab38 internal_error(char const*, ...)
        ???:0
0x6546f4 fancy_abort(char const*, int, char const*)
        ???:0
0x19f0d14
rtl_ssa::function_info::start_block(rtl_ssa::function_info::build_info&,
rtl_ssa::bb_info*)
        ???:0
0x19f0db3
rtl_ssa::function_info::bb_walker::before_dom_children(basic_block_def*)
        ???:0
0x1808697 dom_walker::walk(basic_block_def*)
        ???:0
0x19f1b38 rtl_ssa::function_info::process_all_blocks()
        ???:0
0x194bda4 rtl_ssa::function_info::function_info(function*)
        ???:0
Please submit a full bug report, with preprocessed source.
Please include the complete backtrace with any bug report.
See <https://bugs.archlinux.org/> for instructions.
Preprocessed source stored into /tmp/ccDnfPKX.out file, please attach this to
your bugreport.