[Bug rtl-optimization/103125] New: [ARM]Useless stack initialization on aarch64 big-endian

[dongjianqiang2 at huawei dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103125

            Bug ID: 103125
           Summary: [ARM]Useless stack initialization on aarch64
                    big-endian
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dongjianqiang2 at huawei dot com
  Target Milestone: ---

demo:

typedef struct {
    int a;
} S;

void foo(S s)
{
    return;
}

compile with gcc demo.c -mbig-endian -O2 -S

output:

foo:
        sub     sp, sp, #16
        add     sp, sp, 16
        ret

I think the function must not use the stack, just like compiling with LLVM. is
this gcc bug? 
https://gcc.godbolt.org/z/r35a3PbxE