user: 请从给定的汇编指令推导出C源代码:

```asm
<draw_circle_circum>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %edi,-0x4(%rbp)
  mov    %esi,-0x8(%rbp)
  mov    %edx,-0xc(%rbp)
  mov    %ecx,-0x10(%rbp)
  mov    %r8d,%edx
  mov    %r9d,%ecx
  mov    0x10(%rbp),%eax
  mov    %dl,-0x14(%rbp)
  mov    %ecx,%edx
  mov    %dl,-0x18(%rbp)
  mov    %al,-0x1c(%rbp)
  cmpl   $0x0,-0xc(%rbp)
  jne    L23
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x10(%rbp),%eax
  add    %eax,%esi
  mov    0x18(%rbp),%r8d
  mov    -0x4(%rbp),%eax
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%eax
  sub    -0x10(%rbp),%eax
  mov    %eax,%esi
  mov    0x18(%rbp),%r8d
  mov    -0x4(%rbp),%eax
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%esi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x4(%rbp),%edi
  mov    -0x10(%rbp),%eax
  add    %eax,%edi
  mov    0x18(%rbp),%r8d
  mov    -0x8(%rbp),%eax
  mov    %r8d,%r9d
  mov    %esi,%r8d
  mov    %eax,%esi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x4(%rbp),%eax
  sub    -0x10(%rbp),%eax
  mov    0x18(%rbp),%r8d
  mov    -0x8(%rbp),%esi
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
L23:
  mov    -0xc(%rbp),%eax
  cmp    -0x10(%rbp),%eax
  jne    L4
  movsbl -0x1c(%rbp),%ecx
  movsbl -0x18(%rbp),%edx
  movsbl -0x14(%rbp),%eax
  mov    -0x8(%rbp),%edi
  mov    -0x10(%rbp),%esi
  add    %edi,%esi
  mov    -0x4(%rbp),%r8d
  mov    -0xc(%rbp),%edi
  add    %r8d,%edi
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %ecx,%r8d
  mov    %edx,%ecx
  mov    %eax,%edx
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x10(%rbp),%eax
  add    %eax,%esi
  mov    -0x4(%rbp),%eax
  sub    -0xc(%rbp),%eax
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%esi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%eax
  sub    -0x10(%rbp),%eax
  mov    -0x4(%rbp),%r8d
  mov    -0xc(%rbp),%edi
  add    %r8d,%edi
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %esi,%r8d
  mov    %eax,%esi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%eax
  sub    -0x10(%rbp),%eax
  mov    %eax,%esi
  mov    -0x4(%rbp),%eax
  sub    -0xc(%rbp),%eax
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
L4:
  mov    -0xc(%rbp),%eax
  cmp    -0x10(%rbp),%eax
  jge    L14
  movsbl -0x1c(%rbp),%ecx
  movsbl -0x18(%rbp),%edx
  movsbl -0x14(%rbp),%eax
  mov    -0x8(%rbp),%edi
  mov    -0x10(%rbp),%esi
  add    %edi,%esi
  mov    -0x4(%rbp),%r8d
  mov    -0xc(%rbp),%edi
  add    %r8d,%edi
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %ecx,%r8d
  mov    %edx,%ecx
  mov    %eax,%edx
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x10(%rbp),%eax
  add    %eax,%esi
  mov    -0x4(%rbp),%eax
  sub    -0xc(%rbp),%eax
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%esi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%eax
  sub    -0x10(%rbp),%eax
  mov    -0x4(%rbp),%r8d
  mov    -0xc(%rbp),%edi
  add    %r8d,%edi
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %esi,%r8d
  mov    %eax,%esi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%eax
  sub    -0x10(%rbp),%eax
  mov    %eax,%esi
  mov    -0x4(%rbp),%eax
  sub    -0xc(%rbp),%eax
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%ecx
  movsbl -0x18(%rbp),%edx
  movsbl -0x14(%rbp),%eax
  mov    -0x8(%rbp),%edi
  mov    -0xc(%rbp),%esi
  add    %edi,%esi
  mov    -0x4(%rbp),%r8d
  mov    -0x10(%rbp),%edi
  add    %r8d,%edi
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %ecx,%r8d
  mov    %edx,%ecx
  mov    %eax,%edx
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0xc(%rbp),%eax
  add    %eax,%esi
  mov    -0x4(%rbp),%eax
  sub    -0x10(%rbp),%eax
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%esi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%eax
  sub    -0xc(%rbp),%eax
  mov    -0x4(%rbp),%r8d
  mov    -0x10(%rbp),%edi
  add    %r8d,%edi
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %esi,%r8d
  mov    %eax,%esi
  call   <draw_pixel@plt>
  movsbl -0x1c(%rbp),%edi
  movsbl -0x18(%rbp),%ecx
  movsbl -0x14(%rbp),%edx
  mov    -0x8(%rbp),%eax
  sub    -0xc(%rbp),%eax
  mov    %eax,%esi
  mov    -0x4(%rbp),%eax
  sub    -0x10(%rbp),%eax
  mov    0x18(%rbp),%r8d
  mov    %r8d,%r9d
  mov    %edi,%r8d
  mov    %eax,%edi
  call   <draw_pixel@plt>
L14:
  nop
  leave
  ret
```

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);
  }
}
```