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

```asm
<strtoxl>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %edx,-0x34(%rbp)
  mov    %ecx,-0x38(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  movq   $0x0,-0x10(%rbp)
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x1d(%rbp)
  jmp    L435
L315:
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x1d(%rbp)
L435:
  movsbl -0x1d(%rbp),%eax
  mov    %eax,%edi
  call   <isspace@plt>
  test   %rax,%rax
  jne    L315
  cmpb   $0x2d,-0x1d(%rbp)
  jne    L124
  orl    $0x2,-0x38(%rbp)
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x1d(%rbp)
  jmp    L347
L124:
  cmpb   $0x2b,-0x1d(%rbp)
  jne    L347
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x1d(%rbp)
L347:
  cmpl   $0x0,-0x34(%rbp)
  js     L233
  cmpl   $0x1,-0x34(%rbp)
  je     L233
  cmpl   $0x24,-0x34(%rbp)
  jle    L66
L233:
  cmpq   $0x0,-0x30(%rbp)
  je     L420
  mov    -0x30(%rbp),%rax
  mov    -0x28(%rbp),%rdx
  mov    %rdx,(%rax)
L420:
  mov    $0x0,%eax
  jmp    L382
L66:
  cmpl   $0x0,-0x34(%rbp)
  jne    L436
  cmpb   $0x30,-0x1d(%rbp)
  je     L390
  movl   $0xa,-0x34(%rbp)
  jmp    L436
L390:
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x78,%al
  je     L302
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x58,%al
  jne    L34
L302:
  movl   $0x10,-0x34(%rbp)
  jmp    L436
L34:
  movl   $0x8,-0x34(%rbp)
L436:
  cmpl   $0x10,-0x34(%rbp)
  jne    L232
  cmpb   $0x30,-0x1d(%rbp)
  jne    L232
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x78,%al
  je     L419
  mov    -0x18(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x58,%al
  jne    L232
L419:
  addq   $0x1,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x1d(%rbp)
L232:
  mov    D67(%rip),%rax
  mov    (%rax),%eax
  cltd
  idivl  -0x34(%rbp)
  cltq
  mov    %rax,-0x8(%rbp)
L422:
  movsbl -0x1d(%rbp),%eax
  mov    %eax,%edi
  call   <isdigit@plt>
  test   %rax,%rax
  je     L198
  movsbl -0x1d(%rbp),%eax
  sub    $0x30,%eax
  mov    %eax,-0x1c(%rbp)
  jmp    L26
L198:
  movsbl -0x1d(%rbp),%eax
  mov    %eax,%edi
  call   <isalpha@plt>
  test   %rax,%rax
  je     L264
  movsbl -0x1d(%rbp),%eax
  mov    %eax,%edi
  call   <toupper@plt>
  movsbl %al,%eax
  sub    $0x37,%eax
  mov    %eax,-0x1c(%rbp)
L26:
  mov    -0x34(%rbp),%eax
  cmp    %eax,-0x1c(%rbp)
  jae    L409
  orl    $0x8,-0x38(%rbp)
  mov    -0x10(%rbp),%rax
  cmp    -0x8(%rbp),%rax
  jb     L387
  mov    -0x10(%rbp),%rax
  cmp    -0x8(%rbp),%rax
  jne    L375
  mov    -0x1c(%rbp),%ecx
  mov    D67(%rip),%rax
  mov    (%rax),%eax
  cltd
  idivl  -0x34(%rbp)
  mov    %edx,%eax
  cltq
  cmp    %rax,%rcx
  ja     L375
L387:
  mov    -0x34(%rbp),%eax
  cltq
  imul   -0x10(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x1c(%rbp),%eax
  add    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  jmp    L300
L375:
  orl    $0x4,-0x38(%rbp)
L300:
  mov    -0x18(%rbp),%rax
  lea    0x1(%rax),%rdx
  mov    %rdx,-0x18(%rbp)
  movzbl (%rax),%eax
  mov    %al,-0x1d(%rbp)
  jmp    L422
L264:
  nop
  jmp    L364
L409:
  nop
L364:
  subq   $0x1,-0x18(%rbp)
  mov    -0x38(%rbp),%eax
  and    $0x8,%eax
  test   %eax,%eax
  jne    L314
  cmpq   $0x0,-0x30(%rbp)
  je     L289
  mov    -0x28(%rbp),%rax
  mov    %rax,-0x18(%rbp)
L289:
  movq   $0x0,-0x10(%rbp)
  jmp    L381
L314:
  mov    -0x38(%rbp),%eax
  and    $0x4,%eax
  test   %eax,%eax
  jne    L94
  mov    -0x38(%rbp),%eax
  and    $0x1,%eax
  test   %eax,%eax
  jne    L381
  mov    -0x38(%rbp),%eax
  and    $0x2,%eax
  test   %eax,%eax
  je     L83
  mov    D49(%rip),%rax
  mov    (%rax),%rax
  cmp    %rax,-0x10(%rbp)
  jb     L94
L83:
  mov    -0x38(%rbp),%eax
  and    $0x2,%eax
  test   %eax,%eax
  jne    L381
  mov    D37(%rip),%rax
  mov    (%rax),%rax
  cmp    %rax,-0x10(%rbp)
  jbe    L381
L94:
  mov    D78(%rip),%rax
  mov    (%rax),%edx
  mov    D8(%rip),%rax
  mov    %edx,(%rax)
  mov    -0x38(%rbp),%eax
  and    $0x1,%eax
  test   %eax,%eax
  je     L325
  mov    D67(%rip),%rax
  mov    (%rax),%eax
  cltq
  mov    %rax,-0x10(%rbp)
  jmp    L381
L325:
  mov    -0x38(%rbp),%eax
  and    $0x2,%eax
  test   %eax,%eax
  je     L248
  mov    D49(%rip),%rax
  mov    (%rax),%rax
  mov    %rax,-0x10(%rbp)
  jmp    L381
L248:
  mov    D37(%rip),%rax
  mov    (%rax),%rax
  mov    %rax,-0x10(%rbp)
L381:
  cmpq   $0x0,-0x30(%rbp)
  je     L122
  mov    -0x30(%rbp),%rax
  mov    -0x18(%rbp),%rdx
  mov    %rdx,(%rax)
L122:
  mov    -0x38(%rbp),%eax
  and    $0x2,%eax
  test   %eax,%eax
  je     L98
  mov    -0x10(%rbp),%rax
  neg    %rax
  mov    %rax,-0x10(%rbp)
L98:
  mov    -0x10(%rbp),%rax
L382:
  leave
  ret
```

assistant: ```c
unsigned long strtoxl(const char *nptr, char **endptr, int ibase, int flags) {
  const char *p;
  char c;
  unsigned long number;
  unsigned digval;
  unsigned long maxval;
  p = (const char *)nptr;
  number = 0;
  c = *p++;
  while (isspace(c))
    c = *p++;
  if (c == '-') {
    flags |= 2;
    c = *p++;
  } else if (c == '+') {
    c = *p++;
  }
  if (ibase < 0 || ibase == 1 || ibase > 36) {
    if (endptr)
      *endptr = (char *)nptr;
    return 0L;
  } else if (ibase == 0) {
    if (c != '0') {
      ibase = 10;
    } else if (*p == 'x' || *p == 'X') {
      ibase = 16;
    } else {
      ibase = 8;
    }
  }
  if (ibase == 16) {
    if (c == '0' && (*p == 'x' || *p == 'X')) {
      ++p;
      c = *p++;
    }
  }
  maxval = UINT32_MAX / ibase;
  for (;;) {
    if (isdigit(c)) {
      digval = c - '0';
    } else if (isalpha(c)) {
      digval = toupper(c) - 'A' + 10;
    } else {
      break;
    }
    if (digval >= (unsigned)ibase)
      break;
    flags |= 8;
    if (number < maxval || (number == maxval && (unsigned long)digval <= UINT32_MAX % ibase)) {
      number = number * ibase + digval;
    } else {
      flags |= 4;
    }
    c = *p++;
  }
  --p;
  if (!(flags & 8)) {
    if (endptr)
      p = nptr;
    number = 0;
  } else if ((flags & 4) || (!(flags & 1) && (((flags & 2) && (number < INT32_MIN)) || (!(flags & 2) && (number > INT32_MAX))))) {
    errno = ERANGE;
    if (flags & 1) {
      number = UINT32_MAX;
    } else if (flags & 2) {
      number = INT32_MIN;
    } else {
      number = INT32_MAX;
    }
  }
  if (endptr)
    *endptr = (char *)p;
  if (flags & 2)
    number = (unsigned long)(-(long)number);
  return number;
}
```