https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106331
--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
Breakpoint 6, expand_builtin_memset_args (dest=0x7ffff7b6f1a0,
val=0x7ffff7f86978, len=0x7ffff7f86960, target=0x7ffff7da7400, mode=E_VOIDmode,
orig_exp=0x7ffff7da9d38) at
/export/gnu/import/git/gitlab/x86-gcc/gcc/builtins.cc:4200
4200 dest_mem = 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=1)>
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=8)>
visited
def_stmt _1 = 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 = 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)
Alignment on dest_mem is wrong since array reference isn't constant.
