user: 这段汇编代码用C语言表示是什么样的？

```asm
<factoriza_lu>:
  endbr64
  test   %rsi,%rsi
  jle    L115
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rsi,%rbx
  cmp    $0x1,%rsi
  je     L104
  lea    -0x1(%rsi),%rax
  mov    %rdi,%r15
  mov    $0x8,%r13d
  xor    %r14d,%r14d
  mov    %rax,-0x18(%rsp)
  movq   $0x10,-0x10(%rsp)
  movq   $0x1,-0x20(%rsp)
  nopl   0x0(%rax,%rax,1)
L137:
  mov    -0x20(%rsp),%rdi
  mov    -0x18(%rsp),%rdx
  mov    (%r15,%r14,1),%rbp
  cmp    %rdi,%rbx
  setg   %r12b
  cmp    $0x1,%rdx
  lea    0x0(%rbp,%r14,1),%rcx
  setne  %al
  and    %al,%r12b
  je     L131
  cmp    %rdi,%rbx
  mov    $0x1,%esi
  movsd  (%rcx),%xmm1
  lea    0x0(%rbp,%r13,1),%rax
  cmovg  %rdx,%rsi
  unpcklpd %xmm1,%xmm1
  mov    %rsi,%rdx
  shr    %rdx
  shl    $0x4,%rdx
  add    %rax,%rdx
L31:
  movupd (%rax),%xmm0
  add    $0x10,%rax
  divpd  %xmm1,%xmm0
  movups %xmm0,-0x10(%rax)
  cmp    %rdx,%rax
  jne    L31
  mov    -0x20(%rsp),%rax
  mov    %rsi,%rdx
  and    $0xfffffffffffffffe,%rdx
  add    %rdx,%rax
  cmp    %rdx,%rsi
  je     L54
  lea    0x0(%rbp,%rax,8),%rax
  movsd  (%rax),%xmm0
  divsd  (%rcx),%xmm0
  movsd  %xmm0,(%rax)
L54:
  mov    -0x20(%rsp),%r11
  mov    $0x1,%eax
  lea    0x0(%rbp,%r13,1),%r8
  cmp    %r11,%rbx
  cmovg  -0x18(%rsp),%rax
  mov    %r11,%r9
  mov    %rax,%rdi
  mov    %rax,-0x30(%rsp)
  and    $0xfffffffffffffffe,%rax
  add    %rax,%r9
  mov    %rax,-0x28(%rsp)
  mov    -0x10(%rsp),%rax
  shr    %rdi
  shl    $0x3,%r9
  shl    $0x4,%rdi
  add    %rbp,%rax
  lea    0x0(%rbp,%r9,1),%r10
  mov    %rax,-0x38(%rsp)
  cs nopw 0x0(%rax,%rax,1)
L51:
  mov    (%r15,%r11,8),%rdx
  lea    (%rdx,%r14,1),%rsi
  lea    (%rdx,%r13,1),%rcx
  cmp    -0x38(%rsp),%rcx
  je     L103
  test   %r12b,%r12b
  je     L103
  movsd  (%rsi),%xmm2
  xor    %eax,%eax
  unpcklpd %xmm2,%xmm2
  nopw   0x0(%rax,%rax,1)
L7:
  movupd (%r8,%rax,1),%xmm1
  movupd (%rcx,%rax,1),%xmm0
  mulpd  %xmm2,%xmm1
  subpd  %xmm1,%xmm0
  movups %xmm0,(%rcx,%rax,1)
  add    $0x10,%rax
  cmp    %rdi,%rax
  jne    L7
  mov    -0x28(%rsp),%rcx
  cmp    %rcx,-0x30(%rsp)
  je     L37
  movsd  (%rsi),%xmm1
  mulsd  (%r10),%xmm1
  add    %r9,%rdx
  movsd  (%rdx),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,(%rdx)
L37:
  add    $0x1,%r11
  cmp    %r11,%rbx
  jg     L51
  addq   $0x1,-0x20(%rsp)
  mov    -0x20(%rsp),%rax
  add    $0x8,%r14
  add    $0x8,%r13
  subq   $0x1,-0x18(%rsp)
  addq   $0x8,-0x10(%rsp)
  cmp    %rax,%rbx
  jne    L137
L104:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L103:
  mov    -0x20(%rsp),%rax
  nopl   (%rax)
L110:
  movsd  0x0(%rbp,%rax,8),%xmm1
  mulsd  (%rsi),%xmm1
  movsd  (%rdx,%rax,8),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,(%rdx,%rax,8)
  add    $0x1,%rax
  cmp    %rbx,%rax
  jl     L110
  jmp    L37
L131:
  mov    %rdi,%rax
  xchg   %ax,%ax
L83:
  movsd  0x0(%rbp,%rax,8),%xmm0
  divsd  (%rcx),%xmm0
  movsd  %xmm0,0x0(%rbp,%rax,8)
  add    $0x1,%rax
  cmp    %rax,%rbx
  jg     L83
  jmp    L54
L115:
  ret
```

assistant: ```c
void factoriza_lu(double **A, long n) {
  long i, j, k;
  for (k = 0; k < n; k++) {
    for (j = k + 1; j < n; j++) {
      A[k][j] = A[k][j] / A[k][k];
    }
    for (i = k + 1; i < n; i++) {
      for (j = k + 1; j < n; j++) {
        A[i][j] = A[i][j] - A[i][k] * A[k][j];
      }
    }
  }
}
```