user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<pca>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  mov    %r9,%r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %r8,0x28(%rsp)
  mov    0x90(%rsp),%eax
  mov    0x98(%rsp),%r8d
  mov    %rdx,0x18(%rsp)
  mov    %rsi,0x10(%rsp)
  mov    0x80(%rsp),%r13
  mov    %r8d,0x34(%rsp)
  mov    0x88(%rsp),%rbx
  mov    %rcx,0x20(%rsp)
  mov    %rdi,0x8(%rsp)
  mov    %eax,0x30(%rsp)
  call   <nb_cols_lfmm@plt>
  mov    0x8(%rsp),%rdi
  mov    %eax,%esi
  mov    %eax,%r15d
  call   <nb_lines@plt>
  mov    %r15d,0x0(%r13)
  mov    0x8(%rsp),%r11
  cmp    %eax,%r15d
  mov    %eax,%edx
  mov    %eax,(%r12)
  mov    %eax,%ebp
  mov    (%rbx),%eax
  cmovle %r15d,%edx
  mov    0x34(%rsp),%r8d
  test   %eax,%eax
  je     L51
  cmp    %edx,%eax
  jle    L6
L51:
  mov    %edx,(%rbx)
L19:
  push   0x28(%rsp)
  mov    %r11,%r9
  mov    %r15d,%esi
  mov    %ebp,%edi
  push   0x28(%rsp)
  push   0x28(%rsp)
  push   0x28(%rsp)
  mov    0x50(%rsp),%ecx
  mov    %r11,0x58(%rsp)
  mov    %r8d,0x54(%rsp)
  call   <print_summary_pca@plt>
  mov    %r15d,%edi
  add    $0x20,%rsp
  imul   %ebp,%edi
  shl    $0x3,%edi
  call   <malloc@plt>
  mov    %ebp,%edi
  imul   %ebp,%edi
  mov    %rax,%r14
  shl    $0x3,%edi
  call   <malloc@plt>
  lea    0x0(,%rbp,8),%edi
  mov    %rax,0x8(%rsp)
  call   <malloc@plt>
  mov    (%rbx),%edi
  mov    %rax,%r12
  imul   %ebp,%edi
  shl    $0x3,%edi
  call   <malloc@plt>
  mov    0x38(%rsp),%rdi
  mov    %r14,%rcx
  mov    %r15d,%edx
  mov    %ebp,%esi
  mov    %rax,%r13
  call   <read_data_double@plt>
  mov    0x34(%rsp),%r8d
  test   %r8d,%r8d
  jne    L50
  mov    0x30(%rsp),%eax
  test   %eax,%eax
  jne    L44
L64:
  mov    0x8(%rsp),%rcx
  mov    %r15d,%edx
  mov    %ebp,%esi
  mov    %r14,%rdi
  call   <calc_cov@plt>
  mov    0x8(%rsp),%r15
  mov    (%rbx),%edx
  mov    %r13,%r8
  mov    %r12,%rcx
  mov    %ebp,%esi
  mov    %r15,%rdi
  call   <diagonalize@plt>
  mov    0x10(%rsp),%rdi
  mov    %r12,%rcx
  mov    %ebp,%esi
  mov    $0x1,%edx
  call   <write_data_double@plt>
  mov    (%rbx),%edx
  mov    0x18(%rsp),%rdi
  mov    %r13,%rcx
  mov    %ebp,%esi
  call   <write_data_double@plt>
  mov    %ebp,%esi
  mov    %r12,%rdi
  call   <calc_sdev@plt>
  mov    0x20(%rsp),%rdi
  mov    %r12,%rcx
  mov    %ebp,%esi
  mov    $0x1,%edx
  call   <write_data_double@plt>
  mov    (%rbx),%ecx
  mov    %ebp,%edx
  mov    %r12,%rsi
  mov    %r13,%rdi
  call   <calc_x@plt>
  mov    (%rbx),%edx
  mov    0x28(%rsp),%rdi
  mov    %r13,%rcx
  mov    %ebp,%esi
  call   <write_data_double@plt>
  mov    %r14,%rdi
  call   <free@plt>
  mov    %r15,%rdi
  call   <free@plt>
  mov    %r12,%rdi
  call   <free@plt>
  add    $0x48,%rsp
  mov    %r13,%rdi
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1110 <free@plt>
  xchg   %ax,%ax
L6:
  mov    %eax,%edx
  jmp    L19
  nopw   0x0(%rax,%rax,1)
L44:
  mov    %r15d,%edx
  mov    %ebp,%esi
  mov    %r14,%rdi
  call   <normalize_mean_I@plt>
  jmp    L64
  nopw   0x0(%rax,%rax,1)
L50:
  mov    %r15d,%edx
  mov    %ebp,%esi
  mov    %r14,%rdi
  call   <normalize_cov_I@plt>
  jmp    L64
```

assistant: ```c
void pca(char *input_file, char *output_eva_file, char *output_eve_file, char *output_sdev_file, char *output_x_file, int *n, int *L, int *K, int c, int s) {
  double *data;
  double *cov, *val, *vect;
  int N, M, tmp;
  M = nb_cols_lfmm(input_file);
  N = nb_lines(input_file, M);
  *L = M;
  *n = N;
  if (N < M)
    tmp = N;
  else
    tmp = M;
  if (!(*K) || *K > tmp)
    *K = tmp;
  print_summary_pca(N, M, *K, c, s, input_file, output_eva_file, output_eve_file, output_sdev_file, output_x_file);
  data = (double *)malloc(N * M * sizeof(double));
  cov = (double *)malloc(N * N * sizeof(double));
  val = (double *)malloc(N * sizeof(double));
  vect = (double *)malloc(N * (*K) * sizeof(double));
  read_data_double(input_file, N, M, data);
  if (s)
    normalize_cov_I(data, N, M);
  else if (c)
    normalize_mean_I(data, N, M);
  calc_cov(data, N, M, cov);
  diagonalize(cov, N, *K, val, vect);
  write_data_double(output_eva_file, N, 1, val);
  write_data_double(output_eve_file, N, *K, vect);
  calc_sdev(val, N);
  write_data_double(output_sdev_file, N, 1, val);
  calc_x(vect, val, N, *K);
  write_data_double(output_x_file, N, *K, vect);
  free(data);
  free(cov);
  free(val);
  free(vect);
}
```