user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<kernel_ludcmp>:
  endbr64
  push   %r15
  lea    -0x1(%rdi),%eax
  mov    %edi,%r9d
  push   %r14
  push   %r13
  mov    %rcx,%r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %r8,%rbx
  mov    %rsi,-0x28(%rsp)
  mov    %rdx,-0x20(%rsp)
  mov    %eax,-0x2c(%rsp)
  test   %edi,%edi
  jle    L51
  mov    %rsi,-0x18(%rsp)
  mov    $0xffffffff,%edi
  xor    %eax,%eax
  mov    %rsi,%r15
  mov    %rcx,-0x10(%rsp)
  mov    %rsi,%r14
  xor    %r10d,%r10d
  mov    %rax,%rbp
  mov    %r8,-0x8(%rsp)
  lea    0x3e80(%rsi),%r12
  mov    %edi,%r13d
  nopl   0x0(%rax)
L50:
  mov    %r13d,%eax
  mov    %r14,%r8
  mov    %rbp,%rdi
  lea    0x8(%rsi,%rax,8),%rcx
  xchg   %ax,%ax
L128:
  movsd  (%rsi,%rdi,8),%xmm1
  test   %r10d,%r10d
  je     L111
  mov    %r8,%rdx
  mov    %rsi,%rax
L132:
  movsd  (%rax),%xmm0
  mulsd  (%rdx),%xmm0
  add    $0x8,%rax
  add    $0x3e80,%rdx
  subsd  %xmm0,%xmm1
  cmp    %rcx,%rax
  jne    L132
L111:
  movsd  %xmm1,(%rsi,%rdi,8)
  add    $0x1,%rdi
  add    $0x8,%r8
  cmp    %edi,%r9d
  jg     L128
  lea    0x1(%r10),%ebx
  cmp    %ebx,%r9d
  je     L147
  movsd  (%r12),%xmm1
  lea    0x8(%r15),%r8
  mov    %r15,%rdi
  xor    %eax,%eax
  lea    0x3e88(%rsi),%rcx
  nopl   0x0(%rax)
L158:
  divsd  (%rdi),%xmm1
  lea    0x1(%rax),%r11d
  movsd  %xmm1,-0x8(%rcx)
  cmp    %r10d,%eax
  je     L49
  movsd  (%rcx),%xmm1
  mov    %r8,%rdx
  mov    %r12,%rax
  nopl   0x0(%rax)
L149:
  movsd  (%rax),%xmm0
  mulsd  (%rdx),%xmm0
  add    $0x8,%rax
  add    $0x3e80,%rdx
  subsd  %xmm0,%xmm1
  cmp    %rcx,%rax
  jne    L149
  add    $0x3e88,%rdi
  add    $0x8,%r8
  add    $0x8,%rcx
  mov    %r11d,%eax
  jmp    L158
  nopl   0x0(%rax,%rax,1)
L49:
  add    $0x1,%rbp
  add    $0x8,%r14
  add    $0x1,%r13d
  mov    %ebx,%r10d
  add    $0x3e80,%rsi
  add    $0x3e80,%r12
  jmp    L50
L147:
  mov    -0x18(%rsp),%rbp
  mov    -0x10(%rsp),%r13
  movslq %r9d,%rdi
  xor    %esi,%esi
  mov    -0x8(%rsp),%rbx
  mov    -0x20(%rsp),%r8
  nopl   0x0(%rax,%rax,1)
L21:
  movsd  (%r8,%rsi,8),%xmm1
  test   %rsi,%rsi
  je     L90
  lea    -0x1(%rsi),%ecx
  xor    %eax,%eax
L73:
  movsd  0x0(%rbp,%rax,8),%xmm0
  mulsd  (%rbx,%rax,8),%xmm0
  mov    %rax,%rdx
  add    $0x1,%rax
  subsd  %xmm0,%xmm1
  cmp    %rdx,%rcx
  jne    L73
L90:
  movsd  %xmm1,(%rbx,%rsi,8)
  add    $0x1,%rsi
  add    $0x3e80,%rbp
  cmp    %rsi,%rdi
  jne    L21
L151:
  movslq -0x2c(%rsp),%rcx
  imul   $0x3e88,%rdi,%rdi
  mov    -0x28(%rsp),%rax
  mov    %r9d,%esi
  imul   $0x3e80,%rcx,%rdx
  lea    -0x3e88(%rax,%rdi,1),%rdi
  add    %rax,%rdx
  cs nopw 0x0(%rax,%rax,1)
L26:
  movsd  (%rbx,%rcx,8),%xmm1
  cmp    %esi,%r9d
  jle    L105
  movslq %esi,%rax
  nopl   (%rax)
L20:
  movsd  (%rdx,%rax,8),%xmm0
  mulsd  0x0(%r13,%rax,8),%xmm0
  add    $0x1,%rax
  subsd  %xmm0,%xmm1
  cmp    %eax,%r9d
  jg     L20
L105:
  divsd  (%rdi),%xmm1
  movsd  %xmm1,0x0(%r13,%rcx,8)
  sub    $0x1,%rcx
  sub    $0x1,%esi
  sub    $0x3e88,%rdi
  sub    $0x3e80,%rdx
  test   %ecx,%ecx
  jns    L26
L2:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L51:
  mov    -0x2c(%rsp),%eax
  test   %eax,%eax
  js     L2
  movslq %edi,%rdi
  jmp    L151
```

assistant: ```c
void kernel_ludcmp(int n, double A[2000 + 0][2000 + 0], double b[2000 + 0], double x[2000 + 0], double y[2000 + 0]) {
  int i, j, k;
  double w;
#pragma scop
  for (i = 0; i < n; i++) {
    for (j = 0; j < i; j++) {
      w = A[i][j];
      for (k = 0; k < j; k++) {
        w -= A[i][k] * A[k][j];
      }
      A[i][j] = w / A[j][j];
    }
    for (j = i; j < n; j++) {
      w = A[i][j];
      for (k = 0; k < i; k++) {
        w -= A[i][k] * A[k][j];
      }
      A[i][j] = w;
    }
  }
  for (i = 0; i < n; i++) {
    w = b[i];
    for (j = 0; j < i; j++)
      w -= A[i][j] * y[j];
    y[i] = w;
  }
  for (i = n - 1; i >= 0; i--) {
    w = y[i];
    for (j = i + 1; j < n; j++)
      w -= A[i][j] * x[j];
    x[i] = w / A[i][i];
  }
#pragma endscop
}
```