user: Demonstrate the C code that generates the assembly output below:

```asm
<draw_circle_circum>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %edi,0x4(%rsp)
  mov    %esi,0x8(%rsp)
  mov    %edx,%r14d
  mov    %ecx,(%rsp)
  mov    %r8d,%r15d
  mov    %r9d,0xc(%rsp)
  mov    0x50(%rsp),%ebx
  test   %edx,%edx
  je     L20
L17:
  cmp    (%rsp),%r14d
  je     L53
  mov    (%rsp),%eax
  cmp    %eax,%r14d
  jl     L50
L29:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L20:
  movsbl %bl,%ecx
  movsbl 0xc(%rsp),%edx
  movsbl %r8b,%eax
  add    (%rsp),%esi
  mov    0x58(%rsp),%r9d
  mov    %ecx,%ebp
  mov    %ecx,%r8d
  mov    %edx,%r12d
  mov    %edx,%ecx
  mov    %eax,%r13d
  mov    %eax,%edx
  call   <draw_pixel@plt>
  mov    0x8(%rsp),%esi
  sub    (%rsp),%esi
  mov    0x58(%rsp),%r9d
  mov    %ebp,%r8d
  mov    %r12d,%ecx
  mov    %r13d,%edx
  mov    0x4(%rsp),%edi
  call   <draw_pixel@plt>
  mov    (%rsp),%eax
  add    0x4(%rsp),%eax
  mov    %eax,%edi
  mov    0x58(%rsp),%r9d
  mov    %ebp,%r8d
  mov    %r12d,%ecx
  mov    %r13d,%edx
  mov    0x8(%rsp),%esi
  call   <draw_pixel@plt>
  mov    0x4(%rsp),%edi
  sub    (%rsp),%edi
  mov    0x58(%rsp),%r9d
  mov    %ebp,%r8d
  mov    %r12d,%ecx
  mov    %r13d,%edx
  mov    0x8(%rsp),%esi
  call   <draw_pixel@plt>
  jmp    L17
L53:
  movsbl %bl,%ebx
  movsbl 0xc(%rsp),%r12d
  movsbl %r15b,%ebp
  mov    0x8(%rsp),%r15d
  add    (%rsp),%r15d
  mov    0x4(%rsp),%eax
  lea    (%r14,%rax,1),%r13d
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r12d,%ecx
  mov    %ebp,%edx
  mov    %r15d,%esi
  mov    %r13d,%edi
  call   <draw_pixel@plt>
  mov    0x4(%rsp),%eax
  sub    %r14d,%eax
  mov    %eax,%r14d
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r12d,%ecx
  mov    %ebp,%edx
  mov    %r15d,%esi
  mov    %eax,%edi
  call   <draw_pixel@plt>
  mov    0x8(%rsp),%r15d
  sub    (%rsp),%r15d
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r12d,%ecx
  mov    %ebp,%edx
  mov    %r15d,%esi
  mov    %r13d,%edi
  call   <draw_pixel@plt>
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r12d,%ecx
  mov    %ebp,%edx
  mov    %r15d,%esi
  mov    %r14d,%edi
  call   <draw_pixel@plt>
  jmp    L29
L50:
  movsbl %bl,%ebx
  movsbl 0xc(%rsp),%r13d
  movsbl %r15b,%r12d
  mov    0x8(%rsp),%ebp
  add    %eax,%ebp
  mov    0x4(%rsp),%edx
  lea    (%r14,%rdx,1),%r15d
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r13d,%ecx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    %r15d,%edi
  call   <draw_pixel@plt>
  mov    0x4(%rsp),%ecx
  sub    %r14d,%ecx
  mov    %ecx,%edi
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r13d,%ecx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    %edi,0xc(%rsp)
  call   <draw_pixel@plt>
  mov    0x8(%rsp),%ebp
  sub    (%rsp),%ebp
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r13d,%ecx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    %r15d,%edi
  call   <draw_pixel@plt>
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r13d,%ecx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    0xc(%rsp),%edi
  call   <draw_pixel@plt>
  mov    0x8(%rsp),%ebp
  add    %r14d,%ebp
  mov    (%rsp),%r15d
  add    0x4(%rsp),%r15d
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r13d,%ecx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    %r15d,%edi
  call   <draw_pixel@plt>
  mov    0x4(%rsp),%ecx
  sub    (%rsp),%ecx
  mov    %ecx,%eax
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r13d,%ecx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    %eax,(%rsp)
  mov    %eax,%edi
  call   <draw_pixel@plt>
  mov    0x8(%rsp),%ebp
  sub    %r14d,%ebp
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r13d,%ecx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    %r15d,%edi
  call   <draw_pixel@plt>
  mov    0x58(%rsp),%r9d
  mov    %ebx,%r8d
  mov    %r13d,%ecx
  mov    %r12d,%edx
  mov    %ebp,%esi
  mov    (%rsp),%edi
  call   <draw_pixel@plt>
  jmp    L29
```

assistant: ```c
void draw_circle_circum(int cx, int cy, int x, int y, char r, char g, char b, int screen) {
  int tx, ty;
  if (x == 0) {
    draw_pixel(cx, cy + y, r, g, b, screen);
    draw_pixel(cx, cy - y, r, g, b, screen);
    draw_pixel(cx + y, cy, r, g, b, screen);
    draw_pixel(cx - y, cy, r, g, b, screen);
  }
  if (x == y) {
    draw_pixel(cx + x, cy + y, r, g, b, screen);
    draw_pixel(cx - x, cy + y, r, g, b, screen);
    draw_pixel(cx + x, cy - y, r, g, b, screen);
    draw_pixel(cx - x, cy - y, r, g, b, screen);
  }
  if (x < y) {
    draw_pixel(cx + x, cy + y, r, g, b, screen);
    draw_pixel(cx - x, cy + y, r, g, b, screen);
    draw_pixel(cx + x, cy - y, r, g, b, screen);
    draw_pixel(cx - x, cy - y, r, g, b, screen);
    draw_pixel(cx + y, cy + x, r, g, b, screen);
    draw_pixel(cx - y, cy + x, r, g, b, screen);
    draw_pixel(cx + y, cy - x, r, g, b, screen);
    draw_pixel(cx - y, cy - x, r, g, b, screen);
  }
}
```