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

```asm
<dwt_decode_53>:
  endbr64
  push   %rbx
  mov    %rdi,%rax
  mov    %edx,%edi
  test   %ecx,%ecx
  jne    L432
  test   %esi,%esi
  jg     L84
  cmp    $0x1,%edx
  jg     L84
L423:
  pop    %rbx
  ret
L84:
  test   %edi,%edi
  jle    L135
  lea    -0x1(%rsi,%rsi,1),%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%rbx
  mov    $0x1,%r10d
  mov    $0x1,%r9d
  mov    $0x0,%edx
  jmp    L182
L322:
  mov    0x4(%rax),%r8d
  jns    L424
  lea    0x2(%r8,%r8,1),%r8d
  sar    $0x2,%r8d
  sub    %r8d,%ecx
  mov    %ecx,(%rax,%rdx,8)
  jmp    L316
L200:
  mov    -0x4(%rax,%rdx,8),%r8d
L424:
  cmp    %r11d,%esi
  jle    L348
  movslq %r10d,%r11
  mov    (%rax,%r11,4),%r11d
L22:
  lea    0x2(%r11,%r8,1),%r8d
  sar    $0x2,%r8d
  sub    %r8d,%ecx
  mov    %ecx,(%rax,%rdx,8)
  cmp    %r9d,%edi
  jle    L135
L316:
  add    $0x1,%rdx
  add    $0x1,%r9d
  add    $0x2,%r10d
L182:
  mov    (%rax,%rdx,8),%ecx
  mov    %edx,%r11d
  test   %edx,%edx
  jle    L322
  cmp    %edx,%esi
  jge    L200
  mov    (%rbx),%r8d
L348:
  mov    (%rbx),%r11d
  jmp    L22
L135:
  test   %esi,%esi
  jle    L423
  lea    -0x2(%rdi,%rdi,1),%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%r11
  mov    $0x1,%r9d
  mov    $0x0,%edx
  jmp    L136
L191:
  mov    (%rax),%r8d
  cmp    $0xffffffff,%edx
  jge    L379
  add    %r8d,%r8d
  sar    %r8d
  add    %r10d,%r8d
  mov    %r8d,0x4(%rax,%rdx,8)
  jmp    L353
L228:
  mov    (%rax,%rdx,8),%r8d
  jmp    L379
L42:
  lea    (%r9,%r9,1),%ecx
  movslq %ecx,%rcx
  mov    (%rax,%rcx,4),%ecx
L98:
  add    %r8d,%ecx
  sar    %ecx
  add    %r10d,%ecx
  mov    %ecx,0x4(%rax,%rdx,8)
  cmp    %esi,%ebx
  jge    L423
L353:
  add    $0x1,%rdx
  add    $0x1,%r9d
L136:
  mov    0x4(%rax,%rdx,8),%r10d
  test   %edx,%edx
  js     L191
  cmp    %edi,%edx
  jl     L228
  mov    (%r11),%r8d
L379:
  mov    %r9d,%ebx
  cmp    %edi,%r9d
  jl     L42
  mov    (%r11),%ecx
  jmp    L98
L432:
  test   %edx,%edx
  jne    L278
  cmp    $0x1,%esi
  jne    L278
  mov    (%rax),%ecx
  mov    %ecx,%edx
  shr    $0x1f,%edx
  add    %ecx,%edx
  sar    %edx
  mov    %edx,(%rax)
  jmp    L423
L278:
  test   %edi,%edi
  jle    L9
  lea    -0x2(%rsi,%rsi,1),%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%rbx
  mov    $0x1,%r8d
  mov    $0x0,%edx
  jmp    L374
L375:
  mov    (%rax),%r9d
  cmp    $0xffffffff,%edx
  jge    L273
  lea    0x2(%r9,%r9,1),%r9d
  sar    $0x2,%r9d
  sub    %r9d,%ecx
  mov    %ecx,0x4(%rax,%rdx,8)
  jmp    L367
L210:
  mov    (%rax,%rdx,8),%r9d
  jmp    L273
L361:
  lea    (%r8,%r8,1),%r10d
  movslq %r10d,%r10
  mov    (%rax,%r10,4),%r10d
L8:
  lea    0x2(%r10,%r9,1),%r9d
  sar    $0x2,%r9d
  sub    %r9d,%ecx
  mov    %ecx,0x4(%rax,%rdx,8)
  cmp    %r11d,%edi
  jle    L9
L367:
  add    $0x1,%rdx
  add    $0x1,%r8d
L374:
  mov    0x4(%rax,%rdx,8),%ecx
  test   %edx,%edx
  js     L375
  cmp    %edx,%esi
  jg     L210
  mov    (%rbx),%r9d
L273:
  mov    %r8d,%r11d
  cmp    %r8d,%esi
  jg     L361
  mov    (%rbx),%r10d
  jmp    L8
L9:
  test   %esi,%esi
  jle    L423
  lea    -0x1(%rdi,%rdi,1),%edx
  movslq %edx,%rdx
  lea    (%rax,%rdx,4),%r11
  mov    %esi,%esi
  mov    $0x1,%r8d
  mov    $0x0,%edx
  jmp    L18
L329:
  mov    0x4(%rax),%r10d
L417:
  mov    0x4(%rax),%ecx
  jmp    L92
L422:
  movslq %r8d,%r10
  mov    (%rax,%r10,4),%r10d
  jmp    L110
L262:
  mov    -0x4(%rax,%rdx,8),%ecx
L92:
  add    %r10d,%ecx
  sar    %ecx
  add    %r9d,%ecx
  mov    %ecx,(%rax,%rdx,8)
  add    $0x1,%rdx
  add    $0x2,%r8d
  cmp    %rsi,%rdx
  je     L423
L18:
  mov    (%rax,%rdx,8),%r9d
  mov    %edx,%ecx
  test   %edx,%edx
  js     L329
  cmp    %edx,%edi
  jg     L422
  mov    (%r11),%r10d
L110:
  test   %ecx,%ecx
  je     L417
  cmp    %ecx,%edi
  jge    L262
  mov    (%r11),%ecx
  jmp    L92
```

assistant: ```c
void dwt_decode_53(int *a, int dn, int sn, int cas) {
  int i;
  if (!cas) {
    if ((dn > 0) || (sn > 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;
      }
      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;
      }
    }
  } else {
    if (!sn && dn == 1) {
      a[(0) * 2] /= 2;
    } else {
      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;
      }
      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;
      }
    }
  }
}
```