[Bug fortran/99839] New: ICE in inline_matmul_assign, at fortran/frontend-passes.c:4234

[gscfq@t-online.de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99839

            Bug ID: 99839
           Summary: ICE in inline_matmul_assign, at
                    fortran/frontend-passes.c:4234
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gscfq@t-online.de
  Target Milestone: ---

Affects versions down to r7, at -O1+ :


$ cat z1.f90
program p
   real :: x(3, 3) = 1.0
   class(*), allocatable :: z(:, :)
   z = matmul(x, x)
end


$ gfortran-11-20210328 -c z1.f90 -O0
$ 
$ gfortran-11-20210328 -c z1.f90 -O2
f951: internal compiler error: in inline_matmul_assign, at
fortran/frontend-passes.c:4234
0x7bf248 inline_matmul_assign
        ../../gcc/fortran/frontend-passes.c:4234
0x7bfd69 gfc_code_walker(gfc_code**, int (*)(gfc_code**, int*, void*), int
(*)(gfc_expr**, int*, void*), void*)
        ../../gcc/fortran/frontend-passes.c:5320
0x7c1172 optimize_namespace
        ../../gcc/fortran/frontend-passes.c:1500
0x7c154f gfc_run_passes(gfc_namespace*)
        ../../gcc/fortran/frontend-passes.c:169
0x6fd1a7 gfc_resolve(gfc_namespace*)
        ../../gcc/fortran/resolve.c:17436
0x6e56e4 resolve_all_program_units
        ../../gcc/fortran/parse.c:6290
0x6e56e4 gfc_parse_file()
        ../../gcc/fortran/parse.c:6542
0x7320ef gfc_be_parse_file
        ../../gcc/fortran/f95-lang.c:212