user: 请从给定的汇编指令推导出C源代码：

```asm
<align_W2>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rdi,0x30(%rsp)
  mov    %rsi,0x38(%rsp)
  mov    %rdx,%r15
  mov    %rcx,%r14
  mov    %r8,%r13
  mov    %r9d,%ebx
  mov    0x88(%rsp),%r12d
  movzbl 0xa0(%rsp),%eax
  mov    %al,0x1f(%rsp)
  cmp    0x80(%rsp),%r9d
  mov    %r9d,%ebp
  cmovl  0x80(%rsp),%ebp
  movq   $0x0,(%rdi)
  movq   $0x0,(%rsi)
  lea    0x0(%rbp,%rbp,1),%eax
  mov    %eax,0xc(%rsp)
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,0x20(%rsp)
  mov    0xc(%rsp),%edi
  call   <malloc@plt>
  mov    %rax,%rsi
  mov    %rax,0x28(%rsp)
  lea    0x0(%rbp,%rbp,1),%eax
  cltq
  mov    0x20(%rsp),%rdi
  movb   $0x0,-0x1(%rdi,%rax,1)
  movb   $0x0,-0x1(%rsi,%rax,1)
  mov    %r12d,%eax
  shr    $0x1f,%eax
  add    %r12d,%eax
  sar    %eax
  mov    %eax,0xc(%rsp)
  sub    $0x1,%ebx
  mov    0x80(%rsp),%eax
  lea    -0x1(%rax),%ebp
  test   %ebx,%ebx
  setg   %r8b
  test   %ebp,%ebp
  setg   %r10b
  test   %r8b,%r8b
  jne    L71
  test   %r10b,%r10b
  je     L109
L71:
  mov    0x28(%rsp),%r9
  mov    0x20(%rsp),%rsi
  mov    %rsi,%rdi
  mov    $0x1,%eax
  sub    %esi,%eax
  mov    %eax,0x18(%rsp)
  mov    %r15,0x10(%rsp)
  jmp    L125
L293:
  mov    $0x0,%eax
L95:
  mov    $0x0,%edx
  test   %ebp,%ebp
  jle    L196
  lea    -0x1(%rbp),%edx
  sub    %esi,%edx
  js     L107
  cmp    %edx,%r12d
  jle    L107
  add    %ecx,%edx
  movslq %edx,%rdx
  mov    0x98(%rsp),%esi
  add    0x0(%r13,%rdx,4),%esi
  mov    %esi,%r15d
  movslq %r11d,%rsi
  cmp    0x0(%r13,%rsi,4),%r15d
  setne  %dl
  movzbl %dl,%edx
  sub    $0x1,%edx
  cmp    0x0(%r13,%rsi,4),%r15d
  mov    $0x0,%esi
  cmove  %esi,%eax
L196:
  test   %r8b,%r8b
  je     L193
  test   %r10b,%r10b
  je     L193
  mov    0xc(%rsp),%esi
  sub    %ebx,%esi
  add    %ebp,%esi
  js     L177
  cmp    %esi,%r12d
  jle    L177
  sub    %r12d,%ecx
  add    %ecx,%esi
  movslq %ebp,%rcx
  movslq %ebx,%r8
  movzbl -0x1(%r14,%r8,1),%r15d
  mov    0x10(%rsp),%r10
  cmp    %r15b,-0x1(%r10,%rcx,1)
  mov    $0x0,%ecx
  cmovne 0x90(%rsp),%ecx
  movslq %esi,%rsi
  add    0x0(%r13,%rsi,4),%ecx
  movslq %r11d,%rsi
  cmp    0x0(%r13,%rsi,4),%ecx
  je     L205
L177:
  mov    %edx,%ecx
  and    %eax,%ecx
  cmp    $0xffffffff,%ecx
  jne    L193
L246:
  movslq %ebp,%rcx
  mov    0x10(%rsp),%rsi
  movzbl -0x1(%rsi,%rcx,1),%ecx
  mov    %cl,(%rdi)
  movslq %ebx,%rcx
  movzbl -0x1(%r14,%rcx,1),%ecx
  mov    %cl,(%r9)
L66:
  mov    0x18(%rsp),%esi
  lea    (%rsi,%rdi,1),%ecx
  add    %eax,%ebx
  add    %edx,%ebp
  test   %ebx,%ebx
  setg   %r8b
  test   %ebp,%ebp
  setg   %r10b
  add    $0x1,%rdi
  add    $0x1,%r9
  test   %r8b,%r8b
  jne    L125
  test   %r10b,%r10b
  je     L264
L125:
  mov    %ebx,%esi
  mov    0xc(%rsp),%edx
  sub    %edx,%esi
  mov    %r12d,%ecx
  imul   %ebx,%ecx
  mov    %ebp,%eax
  sub    %esi,%eax
  lea    (%rax,%rcx,1),%r11d
  mov    $0x0,%eax
  test   %ebx,%ebx
  jle    L95
  mov    %ebp,%eax
  sub    %ebx,%eax
  lea    0x1(%rax,%rdx,1),%eax
  test   %eax,%eax
  js     L293
  cmp    %eax,%r12d
  jle    L293
  mov    %ecx,%edx
  sub    %r12d,%edx
  add    %eax,%edx
  movslq %edx,%rdx
  mov    0x98(%rsp),%eax
  add    0x0(%r13,%rdx,4),%eax
  mov    %eax,%edx
  movslq %r11d,%rax
  cmp    0x0(%r13,%rax,4),%edx
  sete   %al
  movzbl %al,%eax
  neg    %eax
  jmp    L95
L205:
  mov    $0xffffffff,%edx
  mov    $0xffffffff,%eax
  jmp    L246
L193:
  cmp    $0xffffffff,%eax
  jne    L198
  test   %edx,%edx
  jne    L198
  movzbl 0x1f(%rsp),%eax
  mov    %al,(%rdi)
  movslq %ebx,%rax
  movzbl -0x1(%r14,%rax,1),%eax
  mov    %al,(%r9)
  mov    $0xffffffff,%eax
  jmp    L66
L198:
  cmp    $0xffffffff,%edx
  jne    L87
  test   %eax,%eax
  jne    L87
  movslq %ebp,%rax
  mov    0x10(%rsp),%rcx
  movzbl -0x1(%rcx,%rax,1),%eax
  mov    %al,(%rdi)
  movzbl 0x1f(%rsp),%eax
  mov    %al,(%r9)
  mov    $0x0,%eax
  jmp    L66
L87:
  mov    0x20(%rsp),%rdi
  call   <free@plt>
  mov    0x28(%rsp),%rdi
  call   <free@plt>
  mov    $0xffffffff,%eax
  jmp    L209
L264:
  movslq %ecx,%rdx
  mov    0x20(%rsp),%rdi
  movb   $0x0,(%rdi,%rdx,1)
  mov    0x28(%rsp),%rbx
  movb   $0x0,(%rbx,%rdx,1)
  mov    %ecx,%r8d
  shr    $0x1f,%r8d
  add    %ecx,%r8d
  sar    %r8d
  cmp    $0x1,%ecx
  jle    L78
  mov    $0x0,%eax
  lea    -0x1(%rdi,%rdx,1),%r10
  lea    -0x1(%rbx,%rdx,1),%r9
  mov    %rdi,%r11
L256:
  lea    (%rax,%r11,1),%rcx
  movzbl (%rcx),%esi
  mov    %r10,%rdx
  sub    %rax,%rdx
  movzbl (%rdx),%edi
  mov    %dil,(%rcx)
  mov    %sil,(%rdx)
  lea    (%rax,%rbx,1),%rcx
  movzbl (%rcx),%esi
  mov    %r9,%rdx
  sub    %rax,%rdx
  movzbl (%rdx),%edi
  mov    %dil,(%rcx)
  mov    %sil,(%rdx)
  add    $0x1,%rax
  cmp    %eax,%r8d
  jg     L256
L78:
  mov    0x30(%rsp),%rax
  mov    0x20(%rsp),%rdi
  mov    %rdi,(%rax)
  mov    0x38(%rsp),%rax
  mov    0x28(%rsp),%rdi
  mov    %rdi,(%rax)
  mov    $0x0,%eax
L209:
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L109:
  mov    0x20(%rsp),%rax
  movb   $0x0,(%rax)
  mov    0x28(%rsp),%rax
  movb   $0x0,(%rax)
  jmp    L78
L107:
  mov    $0x0,%edx
  jmp    L196
```

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;
}
```