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

```asm
<dwt_encode_1>:
  endbr64
  push   %rbx
  mov    %rdi,%rax
  mov    %esi,%edi
  mov    %edx,%esi
  test   %ecx,%ecx
  jne    L252
  test   %edi,%edi
  jg     L244
  cmp    $0x1,%edx
  jg     L244
L104:
  pop    %rbx
  ret
L244:
  test   %edi,%edi
  jle    L149
  lea    -0x2(%rsi,%rsi,1),%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%r11
  mov    $0x1,%r9d
  mov    $0x0,%edx
  jmp    L416
L32:
  mov    (%rax),%r10d
  cmp    $0xffffffff,%edx
  jge    L284
  add    %r10d,%r10d
  sar    %r10d
  sub    %r10d,%r8d
  mov    %r8d,0x4(%rax,%rdx,8)
  jmp    L338
L248:
  mov    (%rax,%rdx,8),%r10d
  jmp    L284
L18:
  lea    (%r9,%r9,1),%ecx
  movslq %ecx,%rcx
  mov    (%rax,%rcx,4),%ecx
L133:
  add    %r10d,%ecx
  sar    %ecx
  sub    %ecx,%r8d
  mov    %r8d,0x4(%rax,%rdx,8)
  cmp    %ebx,%edi
  jle    L149
L338:
  add    $0x1,%rdx
  add    $0x1,%r9d
L416:
  mov    0x4(%rax,%rdx,8),%r8d
  test   %edx,%edx
  js     L32
  cmp    %edx,%esi
  jg     L248
  mov    (%r11),%r10d
L284:
  mov    %r9d,%ebx
  cmp    %r9d,%esi
  jg     L18
  mov    (%r11),%ecx
  jmp    L133
L149:
  test   %esi,%esi
  jle    L104
  lea    -0x1(%rdi,%rdi,1),%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%r11
  mov    $0x1,%r9d
  mov    $0x1,%r8d
  mov    $0x0,%edx
  jmp    L70
L72:
  mov    0x4(%rax),%ecx
  jns    L58
  lea    0x2(%rcx,%rcx,1),%ecx
  sar    $0x2,%ecx
  add    %r10d,%ecx
  mov    %ecx,(%rax,%rdx,8)
  jmp    L0
L412:
  mov    -0x4(%rax,%rdx,8),%ecx
L58:
  cmp    %edi,%ebx
  jge    L401
  movslq %r9d,%rbx
  mov    (%rax,%rbx,4),%ebx
L430:
  lea    0x2(%rbx,%rcx,1),%ecx
  sar    $0x2,%ecx
  add    %r10d,%ecx
  mov    %ecx,(%rax,%rdx,8)
  cmp    %r8d,%esi
  jle    L104
L0:
  add    $0x1,%rdx
  add    $0x1,%r8d
  add    $0x2,%r9d
L70:
  mov    (%rax,%rdx,8),%r10d
  mov    %edx,%ebx
  test   %edx,%edx
  jle    L72
  cmp    %edi,%edx
  jle    L412
  mov    (%r11),%ecx
L401:
  mov    (%r11),%ebx
  jmp    L430
L252:
  test   %edx,%edx
  jne    L292
  cmp    $0x1,%edi
  jne    L292
  shll   (%rax)
  jmp    L104
L292:
  test   %edi,%edi
  jle    L431
  lea    -0x1(%rsi,%rsi,1),%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%rbx
  mov    %edi,%r11d
  mov    $0x1,%r9d
  mov    $0x0,%edx
  jmp    L167
L375:
  mov    0x4(%rax),%r10d
L315:
  mov    0x4(%rax),%ecx
  jmp    L187
L77:
  movslq %r9d,%r10
  mov    (%rax,%r10,4),%r10d
  jmp    L374
L217:
  mov    -0x4(%rax,%rdx,8),%ecx
L187:
  add    %r10d,%ecx
  sar    %ecx
  sub    %ecx,%r8d
  mov    %r8d,(%rax,%rdx,8)
  add    $0x1,%rdx
  add    $0x2,%r9d
  cmp    %r11,%rdx
  je     L431
L167:
  mov    (%rax,%rdx,8),%r8d
  mov    %edx,%ecx
  test   %edx,%edx
  js     L375
  cmp    %edx,%esi
  jg     L77
  mov    (%rbx),%r10d
L374:
  test   %ecx,%ecx
  je     L315
  cmp    %ecx,%esi
  jge    L217
  mov    (%rbx),%ecx
  jmp    L187
L431:
  test   %esi,%esi
  jle    L104
  lea    -0x2(%rdi,%rdi,1),%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%r11
  mov    $0x1,%r8d
  mov    $0x0,%edx
  jmp    L163
L127:
  mov    (%rax),%ecx
  cmp    $0xffffffff,%edx
  jge    L4
  lea    0x2(%rcx,%rcx,1),%ecx
  sar    $0x2,%ecx
  add    %r9d,%ecx
  mov    %ecx,0x4(%rax,%rdx,8)
  jmp    L394
L59:
  mov    (%rax,%rdx,8),%ecx
  jmp    L4
L13:
  lea    (%r8,%r8,1),%r10d
  movslq %r10d,%r10
  mov    (%rax,%r10,4),%r10d
L425:
  lea    0x2(%r10,%rcx,1),%ecx
  sar    $0x2,%ecx
  add    %r9d,%ecx
  mov    %ecx,0x4(%rax,%rdx,8)
  cmp    %ebx,%esi
  jle    L104
L394:
  add    $0x1,%rdx
  add    $0x1,%r8d
L163:
  mov    0x4(%rax,%rdx,8),%r9d
  test   %edx,%edx
  js     L127
  cmp    %edx,%edi
  jg     L59
  mov    (%r11),%ecx
L4:
  mov    %r8d,%ebx
  cmp    %r8d,%edi
  jg     L13
  mov    (%r11),%r10d
  jmp    L425
```

assistant: ```c
void dwt_encode_1(int *a, int dn, int sn, int cas) {
  int i;
  if (!cas) {
    if ((dn > 0) || (sn > 1)) {
      for (i = 0; i < dn; i++)
        a[(1 + (i)*2)] -= (((i) < 0 ? a[(0) * 2] : ((i) >= sn ? a[(sn - 1) * 2] : a[(i)*2])) + ((i + 1) < 0 ? a[(0) * 2] : ((i + 1) >= sn ? a[(sn - 1) * 2] : a[(i + 1) * 2]))) >> 1;
      for (i = 0; i < sn; i++)
        a[(i)*2] += (((i - 1) < 0 ? a[(1 + (0) * 2)] : ((i - 1) >= dn ? a[(1 + (dn - 1) * 2)] : a[(1 + (i - 1) * 2)])) + ((i) < 0 ? a[(1 + (0) * 2)] : ((i) >= dn ? a[(1 + (dn - 1) * 2)] : a[(1 + (i)*2)])) + 2) >> 2;
    }
  } else {
    if (!sn && dn == 1)
      a[(0) * 2] *= 2;
    else {
      for (i = 0; i < dn; i++)
        a[(i)*2] -= (((i) < 0 ? a[(1 + (0) * 2)] : ((i) >= sn ? a[(1 + (sn - 1) * 2)] : a[(1 + (i)*2)])) + ((i - 1) < 0 ? a[(1 + (0) * 2)] : ((i - 1) >= sn ? a[(1 + (sn - 1) * 2)] : a[(1 + (i - 1) * 2)]))) >> 1;
      for (i = 0; i < sn; i++)
        a[(1 + (i)*2)] += (((i) < 0 ? a[(0) * 2] : ((i) >= dn ? a[(dn - 1) * 2] : a[(i)*2])) + ((i + 1) < 0 ? a[(0) * 2] : ((i + 1) >= dn ? a[(dn - 1) * 2] : a[(i + 1) * 2])) + 2) >> 2;
    }
  }
}
```