user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<ec_encode_data_update_avx2>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %edi,-0x4(%rbp)
  mov    %esi,-0x8(%rbp)
  mov    %edx,-0xc(%rbp)
  mov    %ecx,-0x10(%rbp)
  mov    %r8,-0x18(%rbp)
  mov    %r9,-0x20(%rbp)
  cmpl   $0x1f,-0x4(%rbp)
  jg     L31
  mov    -0x20(%rbp),%r8
  mov    -0x18(%rbp),%rdi
  mov    -0x10(%rbp),%ecx
  mov    -0xc(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  sub    $0x8,%rsp
  push   0x10(%rbp)
  mov    %r8,%r9
  mov    %rdi,%r8
  mov    %eax,%edi
  call   <ec_encode_data_update_base@plt>
  add    $0x10,%rsp
  jmp    L71
L70:
  mov    -0x20(%rbp),%rdi
  mov    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  mov    0x10(%rbp),%r9
  mov    %rdi,%r8
  mov    %eax,%edi
  call   <gf_6vect_mad_avx2@plt>
  mov    -0x8(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  shl    $0x6,%eax
  cltq
  add    %rax,-0x18(%rbp)
  addq   $0x30,0x10(%rbp)
  subl   $0x6,-0xc(%rbp)
L31:
  cmpl   $0x6,-0xc(%rbp)
  jg     L70
  cmpl   $0x6,-0xc(%rbp)
  ja     L71
  mov    -0xc(%rbp),%eax
  lea    0x0(,%rax,4),%rdx
  lea    D4(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  cltq
  lea    D4(%rip),%rdx
  add    %rdx,%rax
  notrack jmp *%rax
  mov    -0x20(%rbp),%rdi
  mov    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  mov    0x10(%rbp),%r9
  mov    %rdi,%r8
  mov    %eax,%edi
  call   <gf_6vect_mad_avx2@plt>
  jmp    L71
  mov    -0x20(%rbp),%rdi
  mov    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  mov    0x10(%rbp),%r9
  mov    %rdi,%r8
  mov    %eax,%edi
  call   <gf_5vect_mad_avx2@plt>
  jmp    L71
  mov    -0x20(%rbp),%rdi
  mov    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  mov    0x10(%rbp),%r9
  mov    %rdi,%r8
  mov    %eax,%edi
  call   <gf_4vect_mad_avx2@plt>
  jmp    L71
  mov    -0x20(%rbp),%rdi
  mov    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  mov    0x10(%rbp),%r9
  mov    %rdi,%r8
  mov    %eax,%edi
  call   <gf_3vect_mad_avx2@plt>
  jmp    L71
  mov    -0x20(%rbp),%rdi
  mov    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  mov    0x10(%rbp),%r9
  mov    %rdi,%r8
  mov    %eax,%edi
  call   <gf_2vect_mad_avx2@plt>
  jmp    L71
  mov    0x10(%rbp),%rax
  mov    (%rax),%r8
  mov    -0x20(%rbp),%rdi
  mov    -0x18(%rbp),%rcx
  mov    -0x10(%rbp),%edx
  mov    -0x8(%rbp),%esi
  mov    -0x4(%rbp),%eax
  mov    %r8,%r9
  mov    %rdi,%r8
  mov    %eax,%edi
  call   <gf_vect_mad_avx2@plt>
  jmp    L71
  nop
L71:
  leave
  ret
```

assistant: ```c
void ec_encode_data_update_avx2(int len, int k, int rows, int vec_i, unsigned char *g_tbls, unsigned char *data, unsigned char **coding) {
  if (len < 32) {
    ec_encode_data_update_base(len, k, rows, vec_i, g_tbls, data, coding);
    return;
  }
  while (rows > 6) {
    gf_6vect_mad_avx2(len, k, vec_i, g_tbls, data, coding);
    g_tbls += 6 * k * 32;
    coding += 6;
    rows -= 6;
  }
  switch (rows) {
  case 6:
    gf_6vect_mad_avx2(len, k, vec_i, g_tbls, data, coding);
    break;
  case 5:
    gf_5vect_mad_avx2(len, k, vec_i, g_tbls, data, coding);
    break;
  case 4:
    gf_4vect_mad_avx2(len, k, vec_i, g_tbls, data, coding);
    break;
  case 3:
    gf_3vect_mad_avx2(len, k, vec_i, g_tbls, data, coding);
    break;
  case 2:
    gf_2vect_mad_avx2(len, k, vec_i, g_tbls, data, coding);
    break;
  case 1:
    gf_vect_mad_avx2(len, k, vec_i, g_tbls, data, *coding);
    break;
  case 0:
    break;
  }
}
```