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

```asm
<align_W2>:
  endbr64
  push   %r15
  mov    %rcx,%r15
  push   %r14
  push   %r13
  push   %r12
  mov    %r9d,%r12d
  push   %rbp
  push   %rbx
  mov    %r8,%rbx
  sub    $0x48,%rsp
  movq   $0x0,(%rdi)
  mov    0x80(%rsp),%ebp
  movq   $0x0,(%rsi)
  movzbl 0xa0(%rsp),%eax
  mov    %rdi,0x30(%rsp)
  cmp    %ebp,%r9d
  mov    %ebp,%r13d
  mov    %rdx,0x8(%rsp)
  mov    0x88(%rsp),%r14d
  cmovge %r9d,%r13d
  mov    %rsi,0x38(%rsp)
  mov    %al,0x2a(%rsp)
  add    %r13d,%r13d
  mov    %r13d,%edi
  call   <malloc@plt>
  mov    %r13d,%edi
  movslq %r13d,%r13
  mov    %rax,0x18(%rsp)
  call   <malloc@plt>
  mov    0x18(%rsp),%rdx
  lea    -0x1(%r12),%r9d
  mov    %rax,0x20(%rsp)
  movb   $0x0,-0x1(%rdx,%r13,1)
  movb   $0x0,-0x1(%rax,%r13,1)
  mov    %r14d,%eax
  shr    $0x1f,%eax
  add    %r14d,%eax
  sar    %eax
  test   %r9d,%r9d
  mov    %eax,%r13d
  lea    -0x1(%rbp),%eax
  setg   %dl
  test   %eax,%eax
  mov    %edx,%ebp
  setg   %cl
  jg     L202
  test   %dl,%dl
  je     L405
L202:
  mov    0x18(%rsp),%rdi
  mov    %r14d,%r11d
  mov    0x20(%rsp),%rsi
  mov    %rdi,%rdx
  sub    %edi,%r11d
  cmp    $0x1,%r14d
  jne    L397
  nopl   0x0(%rax,%rax,1)
L334:
  test   %r9d,%r9d
  jle    L501
  lea    -0x1(%r9),%edi
  cmp    %edi,%eax
  jne    L501
  movslq %eax,%r10
  mov    (%rbx,%r10,4),%r8d
  mov    0x98(%rsp),%r10d
  add    %r8d,%r10d
  cmp    %r10d,%r8d
  sete   %r14b
  test   %eax,%eax
  jg     L153
  cmp    %r10d,%r8d
  jne    L396
L467:
  movzbl 0x2a(%rsp),%ecx
  movslq %r9d,%r9
  mov    %cl,(%rdx)
  movzbl -0x1(%r15,%r9,1),%ecx
  mov    %edi,%r9d
  mov    %cl,(%rsi)
L502:
  test   %r9d,%r9d
  lea    (%r11,%rdx,1),%edi
  setg   %bpl
  test   %eax,%eax
  setg   %cl
  add    $0x1,%rdx
  add    $0x1,%rsi
  test   %bpl,%bpl
  jne    L334
  test   %cl,%cl
  jne    L334
L257:
  mov    0x18(%rsp),%rbx
  mov    0x20(%rsp),%rcx
  movslq %edi,%rax
  sar    %edi
  movb   $0x0,(%rbx,%rax,1)
  movb   $0x0,(%rcx,%rax,1)
  je     L165
  lea    -0x1(%rbx,%rax,1),%rdx
  sub    %rbx,%rcx
  lea    -0x1(%rdi),%eax
  lea    0x1(%rbx,%rax,1),%r10
  mov    %rcx,%rdi
  mov    %rbx,%rax
  nopl   0x0(%rax)
L98:
  movzbl (%rax),%ecx
  movzbl (%rdx),%esi
  mov    %sil,(%rax)
  lea    (%rdi,%rax,1),%rsi
  add    $0x1,%rax
  mov    %cl,(%rdx)
  lea    (%rdi,%rdx,1),%rcx
  movzbl (%rsi),%r8d
  sub    $0x1,%rdx
  movzbl (%rcx),%r9d
  mov    %r9b,(%rsi)
  mov    %r8b,(%rcx)
  cmp    %r10,%rax
  jne    L98
L165:
  mov    0x30(%rsp),%rax
  mov    0x18(%rsp),%rbx
  mov    %rbx,(%rax)
  mov    0x38(%rsp),%rax
  mov    0x20(%rsp),%rbx
  mov    %rbx,(%rax)
  add    $0x48,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L501:
  test   %eax,%eax
  jle    L396
  xor    %r14d,%r14d
L153:
  lea    -0x1(%rax),%r8d
  cmp    %r8d,%r9d
  jne    L383
  movslq %r9d,%rdi
  mov    0x98(%rsp),%r10d
  add    (%rbx,%rdi,4),%r10d
  mov    %r10d,%edi
  movslq %eax,%r10
  cmp    (%rbx,%r10,4),%edi
  je     L63
L383:
  test   %cl,%cl
  je     L220
  test   %bpl,%bpl
  je     L220
  movb   $0x0,0x10(%rsp)
L68:
  lea    -0x1(%r9),%edi
  cmp    %eax,%r9d
  je     L499
L31:
  test   %r14b,%r14b
  jne    L467
  cmpb   $0x0,0x10(%rsp)
  je     L396
  movslq %eax,%r10
L178:
  mov    0x8(%rsp),%rax
  movzbl -0x1(%rax,%r10,1),%eax
  mov    %al,(%rdx)
  movzbl 0x2a(%rsp),%eax
  mov    %al,(%rsi)
  mov    %r8d,%eax
  jmp    L502
  nopl   (%rax)
L499:
  mov    0x8(%rsp),%rbp
  movslq %r9d,%r10
  lea    -0x1(%r15,%r10,1),%r12
  movzbl -0x1(%rbp,%r10,1),%r13d
  xor    %ebp,%ebp
  cmp    (%r12),%r13b
  cmovne 0x90(%rsp),%ebp
  mov    %ebp,%ecx
  movslq %edi,%rbp
  add    (%rbx,%rbp,4),%ecx
  cmp    (%rbx,%r10,4),%ecx
  jne    L31
  mov    %r13b,(%rdx)
  movzbl (%r12),%eax
  mov    %edi,%r9d
  mov    %al,(%rsi)
  mov    %r8d,%eax
  jmp    L502
  nopl   0x0(%rax)
L63:
  xor    %r14d,%r14d
  and    %bpl,%cl
  mov    %cl,0x10(%rsp)
  jne    L68
  jmp    L178
  nopw   0x0(%rax,%rax,1)
L220:
  test   %r14b,%r14b
  je     L396
  lea    -0x1(%r9),%edi
  jmp    L467
  xchg   %ax,%ax
L396:
  mov    0x18(%rsp),%rdi
  call   <free@plt>
  mov    0x20(%rsp),%rdi
  call   <free@plt>
  add    $0x48,%rsp
  mov    $0xffffffff,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L405:
  mov    0x18(%rsp),%rax
  movb   $0x0,(%rax)
  mov    0x20(%rsp),%rax
  movb   $0x0,(%rax)
  jmp    L165
  nopl   (%rax)
L397:
  mov    0x20(%rsp),%rdx
  mov    %rdi,%r8
  mov    %rdx,0x10(%rsp)
  mov    $0x1,%edx
  sub    %edi,%edx
  mov    %edx,0x2c(%rsp)
  nopl   0x0(%rax,%rax,1)
L399:
  mov    %r14d,%esi
  mov    %r9d,%edi
  mov    %eax,%edx
  imul   %r9d,%esi
  sub    %r13d,%edi
  sub    %edi,%edx
  add    %esi,%edx
  test   %r9d,%r9d
  jle    L26
  lea    -0x1(%r9),%r11d
  mov    %eax,%r12d
  mov    %r11d,%r10d
  sub    %r13d,%r10d
  sub    %r10d,%r12d
  js     L26
  cmp    %r12d,%r14d
  jle    L26
  mov    %esi,%r10d
  sub    %r14d,%r10d
  add    %r12d,%r10d
  mov    0x98(%rsp),%r12d
  movslq %r10d,%r10
  add    (%rbx,%r10,4),%r12d
  movslq %edx,%r10
  mov    (%rbx,%r10,4),%r10d
  cmp    %r10d,%r12d
  sete   0x2b(%rsp)
  test   %eax,%eax
  jg     L67
  cmp    %r10d,%r12d
  jne    L396
L200:
  movzbl 0x2a(%rsp),%edx
  movslq %r9d,%r9
  mov    0x10(%rsp),%rsi
  mov    %dl,(%r8)
  movzbl -0x1(%r15,%r9,1),%edx
  mov    %r11d,%r9d
  mov    %dl,(%rsi)
L69:
  test   %r9d,%r9d
  mov    0x2c(%rsp),%esi
  setg   %bpl
  test   %eax,%eax
  setg   %cl
  lea    (%rsi,%r8,1),%edi
  addq   $0x1,0x10(%rsp)
  add    $0x1,%r8
  test   %bpl,%bpl
  jne    L399
  test   %cl,%cl
  jne    L399
  jmp    L257
  xchg   %ax,%ax
L26:
  test   %eax,%eax
  jle    L396
  movb   $0x0,0x2b(%rsp)
L67:
  lea    -0x1(%rax),%r10d
  mov    %r10d,%r11d
  sub    %edi,%r11d
  js     L254
  cmp    %r11d,%r14d
  jle    L254
  add    %esi,%r11d
  mov    0x98(%rsp),%edi
  movslq %r11d,%r11
  add    (%rbx,%r11,4),%edi
  mov    %edi,%r11d
  movslq %edx,%rdi
  cmp    (%rbx,%rdi,4),%r11d
  je     L246
L254:
  test   %bpl,%bpl
  je     L452
  test   %cl,%cl
  je     L452
  xor    %ebp,%ebp
L401:
  lea    -0x1(%r9),%r11d
  mov    %r10d,%edi
  mov    %r11d,%ecx
  sub    %r13d,%ecx
  sub    %ecx,%edi
  js     L266
  cmp    %edi,%r14d
  jle    L266
  sub    %r14d,%esi
  movslq %edx,%rdx
  lea    (%rsi,%rdi,1),%ecx
  mov    0x8(%rsp),%rdi
  movslq %eax,%rsi
  movslq %ecx,%rcx
  movzbl -0x1(%rdi,%rsi,1),%esi
  movslq %r9d,%rdi
  lea    -0x1(%r15,%rdi,1),%r12
  xor    %edi,%edi
  cmp    (%r12),%sil
  cmovne 0x90(%rsp),%edi
  add    (%rbx,%rcx,4),%edi
  cmp    (%rbx,%rdx,4),%edi
  je     L498
L266:
  cmpb   $0x0,0x2b(%rsp)
  jne    L200
  test   %bpl,%bpl
  je     L396
L363:
  mov    0x8(%rsp),%rdx
  cltq
  movzbl -0x1(%rdx,%rax,1),%eax
  movzbl 0x2a(%rsp),%edx
  mov    %al,(%r8)
  mov    0x10(%rsp),%rax
  mov    %dl,(%rax)
  mov    %r10d,%eax
  jmp    L69
  cs nopw 0x0(%rax,%rax,1)
L498:
  mov    %sil,(%r8)
  mov    0x10(%rsp),%rdx
  mov    %r11d,%r9d
  movzbl (%r12),%eax
  mov    %al,(%rdx)
  mov    %r10d,%eax
  jmp    L69
  nopw   0x0(%rax,%rax,1)
L246:
  movb   $0x0,0x2b(%rsp)
  and    %cl,%bpl
  jne    L401
  jmp    L363
L452:
  cmpb   $0x0,0x2b(%rsp)
  je     L396
  lea    -0x1(%r9),%r11d
  jmp    L200
```

assistant: ```c
int align_W2(char **X, char **Y, char *a, char *b, int *W, int m_r, int n_c, int w_len, int mismatch, int gap, char gap_char) {
  int i;
  int dr, dc;
  int r, c, w;
  int pos00, pos01, pos10, pos11;
  int w_offset;
  int mm;
  int xy_pos = 0;
  char ch;
  char *tx, *ty;
  i = ((n_c > m_r) ? n_c : m_r);
  *X = NULL;
  *Y = NULL;
  tx = (char *)malloc(sizeof(char) * 2 * i);
  ty = (char *)malloc(sizeof(char) * 2 * i);
  tx[2 * i - 1] = '\0';
  ty[2 * i - 1] = '\0';
  w_offset = w_len / 2;
  r = m_r - 1;
  c = n_c - 1;
  while ((r > 0) || (c > 0)) {
    dr = 0;
    dc = 0;
    w = c - (r - w_offset);
    pos11 = r * w_len + w;
    if (r > 0) {
      w = c - ((r - 1) - w_offset);
      if ((w >= 0) && (w < w_len)) {
        pos01 = (r - 1) * w_len + w;
        if ((W[pos01] + gap) == W[pos11]) {
          dr = -1;
          dc = 0;
        }
      }
    }
    if (c > 0) {
      w = (c - 1) - (r - w_offset);
      if ((w >= 0) && (w < w_len)) {
        pos10 = r * w_len + w;
        if ((W[pos10] + gap) == W[pos11]) {
          dr = 0;
          dc = -1;
        }
      }
    }
    if ((r > 0) && (c > 0)) {
      w = (c - 1) - ((r - 1) - w_offset);
      if ((w >= 0) && (w < w_len)) {
        pos00 = (r - 1) * w_len + w;
        mm = ((a[c - 1] == b[r - 1]) ? 0 : mismatch);
        if ((W[pos00] + mm) == W[pos11]) {
          dr = -1;
          dc = -1;
        }
      }
    }
    if ((dr == -1) && (dc == -1)) {
      tx[xy_pos] = a[c - 1];
      ty[xy_pos] = b[r - 1];
    } else if ((dr == -1) && (dc == 0)) {
      tx[xy_pos] = gap_char;
      ty[xy_pos] = b[r - 1];
    } else if ((dr == 0) && (dc == -1)) {
      tx[xy_pos] = a[c - 1];
      ty[xy_pos] = gap_char;
    } else {
      free(tx);
      free(ty);
      return -1;
    }
    xy_pos++;
    r += dr;
    c += dc;
  }
  tx[xy_pos] = '\0';
  ty[xy_pos] = '\0';
  for (i = 0; i < (xy_pos / 2); i++) {
    ch = tx[i];
    tx[i] = tx[xy_pos - i - 1];
    tx[xy_pos - i - 1] = ch;
    ch = ty[i];
    ty[i] = ty[xy_pos - i - 1];
    ty[xy_pos - i - 1] = ch;
  }
  *X = tx;
  *Y = ty;
  return 0;
}
```