user: 请从给定的汇编指令推导出C源代码:

```asm
<main>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rsi,%rbx
  sub    $0x18,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  cmp    $0x2,%edi
  je     L19
  xor    %edi,%edi
  call   <usage@plt>
L19:
  mov    0x8(%rbx),%rdi
  lea    0x4(%rsp),%rdx
  lea    D15(%rip),%rsi
  call   <sscanf@plt>
  test   %rax,%rax
  je     L23
  mov    0x4(%rsp),%eax
  lea    -0x8(%rax),%edx
  and    $0xfffffff7,%edx
  je     L141
  cmp    $0x20,%eax
  jne    L23
L141:
  xor    %edi,%edi
  call   <time@plt>
  mov    %eax,%edi
  call   <srand48@plt>
  mov    $0x10,%edi
  call   <malloc@plt>
  mov    $0x10,%edi
  mov    %rax,%rbp
  call   <malloc@plt>
  lea    0x10(%rbp),%rbx
  mov    %rbp,%r13
  mov    %rax,%r12
  nop
L41:
  xor    %eax,%eax
  add    $0x1,%r13
  call   <lrand48@plt>
  movslq %eax,%rdx
  mov    %eax,%ecx
  imul   $0xffffffff80808081,%rdx,%rdx
  sar    $0x1f,%ecx
  shr    $0x20,%rdx
  add    %eax,%edx
  sar    $0x7,%edx
  sub    %ecx,%edx
  mov    %edx,%ecx
  shl    $0x8,%ecx
  sub    %edx,%ecx
  sub    %ecx,%eax
  mov    %al,-0x1(%r13)
  cmp    %rbx,%r13
  jne    L41
  mov    $0x10,%edx
  mov    %rbp,%rsi
  mov    %r12,%rdi
  call   <memcpy@plt>
  mov    0x4(%rsp),%eax
  cmp    $0x8,%eax
  je     L122
  cmp    $0x10,%eax
  je     L118
  cmp    $0x20,%eax
  je     L136
L145:
  mov    0x8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L50
  add    $0x18,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L23:
  lea    D21(%rip),%rdi
  call   <usage@plt>
  jmp    L141
L122:
  mov    $0x10,%esi
  mov    %rbp,%rdi
  xor    %ebx,%ebx
  call   <reed_sol_galois_w08_region_multby_2@plt>
  lea    D39(%rip),%r13
  cs nopw 0x0(%rax,%rax,1)
L134:
  movzbl 0x0(%rbp,%rbx,1),%ecx
  movzbl (%r12,%rbx,1),%edx
  mov    %ebx,%esi
  mov    %r13,%rdi
  add    $0x1,%rbx
  call   <printf@plt>
  cmp    $0x10,%rbx
  jne    L134
  jmp    L145
L118:
  mov    $0x10,%esi
  mov    %rbp,%rdi
  xor    %ebx,%ebx
  sub    %rbp,%r12
  call   <reed_sol_galois_w16_region_multby_2@plt>
  lea    D2(%rip),%r13
  nopl   0x0(%rax)
L129:
  movzwl 0x0(%rbp),%ecx
  movzwl (%r12,%rbp,1),%edx
  mov    %ebx,%esi
  mov    %r13,%rdi
  add    $0x1,%ebx
  add    $0x2,%rbp
  call   <printf@plt>
  cmp    $0x8,%ebx
  jne    L129
  jmp    L145
L136:
  mov    $0x10,%esi
  mov    %rbp,%rdi
  xor    %ebx,%ebx
  call   <reed_sol_galois_w16_region_multby_2@plt>
  lea    D27(%rip),%r13
L15:
  mov    0x0(%rbp,%rbx,4),%ecx
  mov    (%r12,%rbx,4),%edx
  mov    %ebx,%esi
  mov    %r13,%rdi
  add    $0x1,%rbx
  call   <printf@plt>
  cmp    $0x4,%rbx
  jne    L15
  jmp    L145
L50:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_label: D15
type_infered: string
name: read_data
arguments: data_label: D21
type_infered: string
name: read_data
arguments: data_label: D39
type_infered: string
name: read_data
arguments: data_label: D2
type_infered: string
name: read_data
arguments: data_label: D27
type_infered: string

tool: D15: %d

tool: D21: Bad w

tool: D39: Char %2d: %3u *2 = %3u


tool: D2: Short %2d: %5u *2 = %5u


tool: D27: Int %2d: %10u *2 = %10u


assistant: ```c
int main(int argc, char **argv) {
  unsigned char *x, *y;
  unsigned short *xs, *ys;
  unsigned int *xi, *yi;
  int *a32, *copy;
  int i;
  int w;
  if (argc != 2)
    usage(NULL);
  if (sscanf(argv[1], "%d", &w) == 0 || (w != 8 && w != 16 && w != 32))
    usage("Bad w");
  srand48(time(0));
  a32 = (int *)malloc(sizeof(int) * (4));
  copy = (int *)malloc(sizeof(int) * (4));
  y = (unsigned char *)a32;
  for (i = 0; i < 4 * sizeof(int); i++)
    y[i] = lrand48() % 255;
  memcpy(copy, a32, sizeof(int) * 4);
  if (w == 8) {
    x = (unsigned char *)copy;
    y = (unsigned char *)a32;
    reed_sol_galois_w08_region_multby_2((char *)a32, sizeof(int) * 4);
    for (i = 0; i < 4 * sizeof(int) / sizeof(char); i++) {
      printf("Char %2d: %3u *2 = %3u\n", i, x[i], y[i]);
    }
  } else if (w == 16) {
    xs = (unsigned short *)copy;
    ys = (unsigned short *)a32;
    reed_sol_galois_w16_region_multby_2((char *)a32, sizeof(int) * 4);
    for (i = 0; i < 4 * sizeof(int) / sizeof(short); i++) {
      printf("Short %2d: %5u *2 = %5u\n", i, xs[i], ys[i]);
    }
  } else if (w == 32) {
    xi = (unsigned int *)copy;
    yi = (unsigned int *)a32;
    reed_sol_galois_w16_region_multby_2((char *)a32, sizeof(int) * 4);
    for (i = 0; i < 4 * sizeof(int) / sizeof(int); i++) {
      printf("Int %2d: %10u *2 = %10u\n", i, xi[i], yi[i]);
    }
  }
}
```