[Bug debug/104337] New: ICE when compiling with optimize attribute at -m32 -g3 -O0

[tlwang at uwaterloo dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104337

            Bug ID: 104337
           Summary: ICE when compiling with optimize attribute at -m32 -g3
                    -O0
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tlwang at uwaterloo dot ca
  Target Milestone: ---

This occurs in attributes_transformed_program0_preprocessed.c, shown below:

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/scratch/software/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/12.0.1/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/configure
--enable-languages=c,c++,lto --enable-checking-yes --enable-multiarch
--prefix=/scratch/software/gcc-trunk --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 12.0.1 20220201 (experimental) [master -g1bb526625] (GCC)
$
$ cat attributes_transformed_program0_preprocessed.c
struct a {
  unsigned b : 7;
};
__attribute__((optimize(3))) __attribute__((always_inline)) struct a c() {
  struct a d;
  return d;
}
void e() {
  for (;;)
    c();
}
int main() {}
$
$ gcc-trunk -m32 -O0 -g3 attributes_transformed_program0_preprocessed.c
attributes_transformed_program0_preprocessed.c:4:70: warning: ‘always_inline’
function might not be inlinable [-Wattributes]
    4 | __attribute__((optimize(3))) __attribute__((always_inline)) struct a
c() {
      |                                                                      ^
during RTL pass: final
attributes_transformed_program0_preprocessed.c: In function ‘e’:
attributes_transformed_program0_preprocessed.c:11:1: internal compiler error:
in decl_ultimate_origin, at dwarf2out.cc:4466
   11 | }
      | ^
0x71239e decl_ultimate_origin
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:4466
0x71239e decl_ultimate_origin
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:4454
0xbb0b17 process_scope_var
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:26452
0xbb0c2f decls_for_scope
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:26515
0xbd36c6 gen_inlined_subroutine_die
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:24964
0xbd36c6 gen_block_die
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:26419
0xbb0cea decls_for_scope
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:26544
0xbb14a2 gen_subprogram_die
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:24026
0xbcf88f gen_decl_die
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:26952
0xbd11f6 dwarf2out_decl
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:27530
0xbd1572 dwarf2out_function_decl
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/dwarf2out.cc:27545
0xc34e70 rest_of_handle_final
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/final.cc:4321
0xc34e70 execute
        /tmp/tmp.JKF7BF3fiK-gcc-builder/gcc/gcc/final.cc:4363
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.