[Bug c++/108198] New: G++ fails to compile large 2D array initializer.

[Bug c++/108198] New: G++ fails to compile large 2D array initializer.

[filip.rak81 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

            Bug ID: 108198
           Summary: G++ fails to compile large 2D array initializer.
           Product: gcc
           Version: 12.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: filip.rak81 at gmail dot com
  Target Milestone: ---

Created attachment 54148
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54148&action=edit
Preprocessed output.

The following code (containing 2048x10 array initialization):

  #define ROW { { 0.0,  0.0 }, {  1.0,  1.0 }, {  2.0,  2.0 }, {  3.0,  3.0 },
{  4.0,  4.0 }, \
    {  5.0,  5.0 }, {  6.0,  6.0 }, {  7.0,  7.0 }, {  8.0,  8.0 }, {  9.0, 
9.0 } }
 #define ROW8 ROW, ROW, ROW, ROW, ROW, ROW, ROW, ROW
  #define ROW64 ROW8, ROW8, ROW8, ROW8, ROW8, ROW8, ROW8, ROW8
  #define ROW512 ROW64, ROW64, ROW64, ROW64, ROW64, ROW64, ROW64, ROW64
  #define ROW4096 ROW512, ROW512, ROW512, ROW512, ROW512, ROW512, ROW512,
ROW512

  template <typename T>
  class cplx_t {
  public:
    T m_re;
   T m_im;

      cplx_t() : m_re(), m_im() {
      }

      cplx_t(const T& re, const T& im) : m_re(re), m_im(im) {
      }
  };

  cplx_t<double> test_arr[2048][10] = {
      ROW512, ROW512, ROW512, ROW512
  };

  int main() {
  }

causes compiler to abort compilation without any error message.

GCC used:
  g++.exe (MinGW-W64 x86_64-ucrt-posix-seh, built by Brecht Sanders) 12.2.0
  Copyright (C) 2022 Free Software Foundation, Inc.
  This is free software; see the source for copying conditions.  There is NO 
  warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

System:
  Windows 11.

Compilation command line:
  - g++ -v -save-temps ./test_large_init.cpp

Compiler output:

Using built-in specs.
COLLECT_GCC=C:\ProgramData\chocolatey\lib\mingw\tools\install\mingw64\bin\g++.exe
COLLECT_LTO_WRAPPER=c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/12.2.0/lto-wrapper.exe
OFFLOAD_TARGET_NAMES=nvptx-none
Target: x86_64-w64-mingw32
Configured with: ../configure
--prefix=/r/winlibs64-11.3.0ucrt/2604.gcc/inst_gcc-12.2.0/share/gcc
--build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32
--enable-offload-targets=nvptx-none --with-pkgversion='MinGW-W64
x86_64-ucrt-posix-seh, built by Brecht Sanders' --with-tune=generic
--enable-checking=release --enable-threads=posix --disable-sjlj-exceptions
--disable-libunwind-exceptions --disable-serial-configure --disable-bootstrap
--enable-host-shared --enable-plugin --disable-default-ssp --disable-rpath
--disable-libstdcxx-debug --disable-version-specific-runtime-libs --with-stabs
--disable-symvers --enable-languages=c,c++,fortran,lto,objc,obj-c++,jit
--disable-gold --disable-nls --disable-stage1-checking --disable-win32-registry
--disable-multilib --enable-ld --enable-libquadmath --enable-libada
--enable-libssp --enable-libstdcxx --enable-lto --enable-fully-dynamic-string
--enable-libgomp --enable-graphite --enable-mingw-wildcard
--enable-libstdcxx-time --disable-libstdcxx-pch
--with-mpc=/e/Prog/winlibs64-11.3.0ucrt/custombuilt
--with-mpfr=/e/Prog/winlibs64-11.3.0ucrt/custombuilt
--with-gmp=/e/Prog/winlibs64-11.3.0ucrt/custombuilt
--with-isl=/e/Prog/winlibs64-11.3.0ucrt/custombuilt
--enable-libstdcxx-backtrace --enable-install-libiberty --enable-__cxa_atexit
--without-included-gettext --with-diagnostics-color=auto
--enable-clocale=generic --with-libiconv --with-system-zlib
--with-build-sysroot=/r/winlibs64-11.3.0ucrt/2604.gcc/gcc-12.2.0/build_mingw/mingw-w64
CFLAGS='-I/e/Prog/winlibs64-11.3.0ucrt/custombuilt/include/libdl-win32
-D__USE_MINGW_ACCESS' CXXFLAGS=-D__USE_MINGW_ACCESS
LDFLAGS='-Wl,--disable-nxcompat -Wl,--disable-high-entropy-va
-Wl,--disable-dynamicbase'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.0 (MinGW-W64 x86_64-ucrt-posix-seh, built by Brecht Sanders)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic'
'-march=x86-64' '-dumpdir' 'a-'

c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/12.2.0/cc1plus.exe
-E -quiet -v -iprefix
c:\programdata\chocolatey\lib\mingw\tools\install\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/12.2.0/
-D_REENTRANT ./test_large_init.cpp -mtune=generic -march=x86-64
-fpch-preprocess -o a-test_large_init.ii
ignoring duplicate directory
"c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../include/c++/12.2.0"
ignoring duplicate directory
"c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../include/c++/12.2.0/x86_64-w64-mingw32"
ignoring duplicate directory
"c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../include/c++/12.2.0/backward"
ignoring duplicate directory
"c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/12.2.0/include"
ignoring nonexistent directory
"R:/winlibs64-11.3.0ucrt/2604.gcc/inst_gcc-12.2.0/share/gcc/include"
ignoring nonexistent directory
"/r/winlibs64-11.3.0ucrt/2604.gcc/inst_gcc-12.2.0/share/gcc/include"
ignoring duplicate directory
"c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/12.2.0/include-fixed"
ignoring duplicate directory
"c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/lib/gcc/../../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/include"
ignoring nonexistent directory "/mingw/include"
#include "..." search starts here:
#include <...> search starts here:

c:\programdata\chocolatey\lib\mingw\tools\install\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../include/c++/12.2.0

c:\programdata\chocolatey\lib\mingw\tools\install\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../include/c++/12.2.0/x86_64-w64-mingw32

c:\programdata\chocolatey\lib\mingw\tools\install\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../include/c++/12.2.0/backward

c:\programdata\chocolatey\lib\mingw\tools\install\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/12.2.0/include

c:\programdata\chocolatey\lib\mingw\tools\install\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../include

c:\programdata\chocolatey\lib\mingw\tools\install\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/12.2.0/include-fixed

c:\programdata\chocolatey\lib\mingw\tools\install\mingw64\bin\../lib/gcc/x86_64-w64-mingw32/12.2.0/../../../../x86_64-w64-mingw32/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic'
'-march=x86-64' '-dumpdir' 'a-'

c:/programdata/chocolatey/lib/mingw/tools/install/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/12.2.0/cc1plus.exe
-fpreprocessed a-test_large_init.ii -quiet -dumpdir a- -dumpbase
test_large_init.cpp -dumpbase-ext .cpp -mtune=generic -march=x86-64 -version -o
a-test_large_init.s
GNU C++17 (MinGW-W64 x86_64-ucrt-posix-seh, built by Brecht Sanders) version
12.2.0 (x86_64-w64-mingw32)
        compiled by GNU C version 12.2.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version UNKNOWN-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++17 (MinGW-W64 x86_64-ucrt-posix-seh, built by Brecht Sanders) version
12.2.0 (x86_64-w64-mingw32)
        compiled by GNU C version 12.2.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version UNKNOWN-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 16512d3bcd6e7fc30e988209e0d6f609

[Bug c++/108198] G++ fails to compile large 2D array initializer.

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
               Host|                            |x86_64-w64-mingw32
             Target|                            |x86_64-w64-mingw32

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Works fine for me on x86_64-linux

> /usr/bin/time ~/install/gcc-12/usr/local/bin/g++ -S t.C  
3.12user 0.13system 0:03.25elapsed 99%CPU (0avgtext+0avgdata
518408maxresident)k
0inputs+0outputs (0major+133817minor)pagefaults 0swaps

are you running out of memory?

[Bug c++/108198] G++ fails to compile large 2D array initializer.

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2022-12-22
                 CC|                            |marxin at gcc dot gnu.org
             Status|UNCONFIRMED                 |WAITING
     Ever confirmed|0                           |1

[Bug c++/108198] G++ fails to compile large 2D array initializer.

[filip.rak81 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

--- Comment #2 from Filip Rak <filip.rak81 at gmail dot com> ---
Hi :)
Don't think so, it's 40GB RAM machine.
Besides that - please look here:
  https://godbolt.org/z/W7cdvfqvY
Best regards!

[Bug c++/108198] G++ fails to compile large 2D array initializer.

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
what's your ulimit -s ?

[Bug c++/108198] G++ fails to compile large 2D array initializer.

[filip.rak81 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

--- Comment #4 from Filip Rak <filip.rak81 at gmail dot com> ---
This is Windows system, not Linux :(

[Bug c++/108198] G++ fails to compile large 2D array initializer.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |compile-time-hog,
                   |                            |memory-hog

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Windows has a fixed stack limit and it is usually smallish.

[Bug c++/108198] G++ fails to compile large 2D array initializer.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

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

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

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
For -fchecking:

#2513 0x00000000019eba7a in verify_gimple_in_seq_2 (stmts=0x7ffff2af3b40) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:5226
#2514 0x00000000019eba7a in verify_gimple_in_seq_2 (stmts=0x7ffff2af3a50) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:5226
#2515 0x00000000019eba7a in verify_gimple_in_seq_2 (stmts=0x7ffff2af39b0) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:5226
#2516 0x00000000019eba7a in verify_gimple_in_seq_2 (stmts=0x7ffff2af38c0) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:5226
#2517 0x00000000019eba7a in verify_gimple_in_seq_2 (stmts=0x7ffff2af3820) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:5226
#2518 0x00000000019eba7a in verify_gimple_in_seq_2 (stmts=0x7ffff2af3730) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:5226


For -fno-checking:

#26 0x00000000019f8f7f in do_warn_unused_result (seq=0x7ffff2882190) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:9734
#27 0x00000000019f8f7f in do_warn_unused_result (seq=0x7ffff28820a0) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:9734
#28 0x00000000019f8f7f in do_warn_unused_result (seq=0x7ffff2882000) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:9734
#29 0x00000000019f8f7f in do_warn_unused_result (seq=0x7ffff2881f00) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:9734
#30 0x00000000019f8f7f in do_warn_unused_result (seq=0x7ffff2881e60) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:9734
#31 0x00000000019f8f7f in do_warn_unused_result (seq=0x7ffff2881d70) at
/home/apinski/src/upstream-gcc/gcc/gcc/tree-cfg.cc:9734


This is for ulimit -s 4096.

[Bug c++/108198] G++ fails to compile large 2D array initializer.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 54151
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54151&action=edit
patch which should fix/improve -fno-checking case

Note the formating on the code needs to be fixed but this should improve the
situtation for -fno-checking case.
Instead of being recusive, we have a worklist. Should reduce the stack usage.

[Bug middle-end/108198] G++ fails to compile large 2D array initializer.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
verify_gimple_in_seq_2 could get the same worklist handling too.

[Bug middle-end/108198] G++ fails to compile large 2D array initializer.

[filip.rak81 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108198

--- Comment #9 from Filip Rak <filip.rak81 at gmail dot com> ---
Hello,
  I have no idea if this is important, but marking cplx_t constructors as
constexpr causes that code can be successfully compiled.
Best regards!