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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/106331] [12/13 Regression] Whole array assignment of
 empty string segfaults with -Og since r12-2633-ge5e164effa30fd2b
Date: Tue, 19 Jul 2022 03:37:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106331

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
Breakpoint 6, expand_builtin_memset_args (dest=3D0x7ffff7b6f1a0,
val=3D0x7ffff7f86978, len=3D0x7ffff7f86960, target=3D0x7ffff7da7400, mode=
=3DE_VOIDmode,
orig_exp=3D0x7ffff7da9d38) at
/export/gnu/import/git/gitlab/x86-gcc/gcc/builtins.cc:4200
4200      dest_mem =3D get_memory_rtx (dest, len);
(gdb) call debug_tree (dest)
 <save_expr 0x7ffff7b6f1a0
    type <pointer_type 0x7ffff7f93738
        type <array_type 0x7ffff7f932a0 type <integer_type 0x7ffff7db9348
character(kind=3D1)>
            string-flag BLK
            size <integer_cst 0x7ffff7dc00c0 constant 192>
            unit-size <integer_cst 0x7ffff7dc0090 constant 24>
            align:8 warn_if_not_align:0 symtab:0 alias-set 2 canonical-type
0x7ffff7f932a0 domain <integer_type 0x7ffff7f931f8>
            pointer_to_this <pointer_type 0x7ffff7f93738>>
        public unsigned DI
        size <integer_cst 0x7ffff7da1c00 constant 64>
        unit-size <integer_cst 0x7ffff7da1c18 constant 8>
        align:64 warn_if_not_align:0 symtab:0 alias-set 1 canonical-type
0x7ffff7f93738>
    side-effects
    arg:0 <addr_expr 0x7ffff7f79e00 type <pointer_type 0x7ffff7f93738>

        arg:0 <array_ref 0x7ffff7dabf50 type <array_type 0x7ffff7f932a0>
            arg:0 <var_decl 0x7ffff7dadb40 a>
            arg:1 <ssa_name 0x7ffff7da97e0 type <integer_type 0x7ffff7db9738
integer(kind=3D8)>
                visited
                def_stmt _1 =3D S.0_3 + -1;
                version:1>
            x.f90:3:6 start: x.f90:3:6 finish: x.f90:3:6>
        x.f90:3:6 start: x.f90:3:6 finish: x.f90:3:6>
    x.f90:3:6 start: x.f90:3:6 finish: x.f90:3:6>
(gdb) next
4201      val_mode =3D TYPE_MODE (unsigned_char_type_node);
(gdb) call debug_rtx (dest_mem)
(mem/c:BLK (reg:DI 92 [ D.4232 ]) [0 MEM <c_char[0:]> [(void *)&a]+0 A128])
(gdb)=20

Alignment on dest_mem is wrong since array reference isn't constant.=