user: 这段汇编代码用C语言表示是什么样的:

```asm
<fn2>:
  endbr64
  push   %rbp
  mov    %edi,%edx
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  lea    (%rdi,%rdi,2),%ebx
  movslq %ebx,%rbx
  shl    $0x3,%rbx
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  lea    0xf(%rbx),%rax
  mov    %rsp,%rsi
  mov    %rax,%rdi
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rdi
  and    $0xfffffffffffffff0,%rcx
  sub    %rdi,%rsi
  cmp    %rsi,%rsp
  je     L28
L199:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rsi,%rsp
  jne    L199
L28:
  and    $0xfff,%ecx
  sub    %rcx,%rsp
  test   %rcx,%rcx
  jne    L1
L104:
  mov    %rax,%rdi
  mov    %rsp,%rsi
  mov    %rax,%rcx
  mov    %rsp,%r13
  and    $0xfffffffffffff000,%rdi
  and    $0xfffffffffffffff0,%rcx
  sub    %rdi,%rsi
  cmp    %rsi,%rsp
  je     L115
L122:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rsi,%rsp
  jne    L122
L115:
  and    $0xfff,%ecx
  sub    %rcx,%rsp
  test   %rcx,%rcx
  jne    L78
L34:
  mov    %rax,%rdi
  mov    %rsp,%rsi
  mov    %rax,%rcx
  mov    %rsp,%r14
  and    $0xfffffffffffff000,%rdi
  and    $0xfffffffffffffff0,%rcx
  sub    %rdi,%rsi
  cmp    %rsi,%rsp
  je     L65
L4:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rsi,%rsp
  jne    L4
L65:
  and    $0xfff,%ecx
  sub    %rcx,%rsp
  test   %rcx,%rcx
  je     L136
  orq    $0x0,-0x8(%rsp,%rcx,1)
L136:
  mov    %rax,%rcx
  mov    %rsp,%rsi
  and    $0xfffffffffffff000,%rax
  mov    %rsp,%r12
  sub    %rax,%rsi
  and    $0xfffffffffffffff0,%rcx
  cmp    %rsi,%rsp
  je     L41
L192:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rsi,%rsp
  jne    L192
L41:
  mov    %rcx,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  je     L38
  orq    $0x0,-0x8(%rsp,%rax,1)
L38:
  mov    %rsp,%r8
  mov    %r14,%rsi
  mov    %r13,%rdi
  mov    %edx,-0x44(%rbp)
  mov    %r8,-0x50(%rbp)
  call   <fn1@plt>
  movslq -0x44(%rbp),%r15
  mov    -0x50(%rbp),%rdi
  lea    (%r12,%r15,8),%r12
  mov    %r15,%rdx
  mov    %r12,%rsi
  call   <fn1@plt>
  mov    -0x44(%rbp),%edx
  test   %edx,%edx
  jle    L152
  test   %rbx,%rbx
  js     L188
  pxor   %xmm2,%xmm2
  cvtsi2sd %rbx,%xmm2
L64:
  xor    %eax,%eax
  pxor   %xmm1,%xmm1
  nopw   0x0(%rax,%rax,1)
L79:
  movsd  0x0(%r13,%rax,8),%xmm0
  mulsd  (%r14,%rax,8),%xmm0
  addsd  (%r12,%rax,8),%xmm0
  add    $0x1,%rax
  addsd  %xmm2,%xmm0
  subsd  %xmm2,%xmm0
  addsd  %xmm0,%xmm1
  cmp    %rax,%r15
  jne    L79
L59:
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L61
  lea    -0x28(%rbp),%rsp
  movapd %xmm1,%xmm0
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
  nopw   0x0(%rax,%rax,1)
L1:
  orq    $0x0,-0x8(%rsp,%rcx,1)
  jmp    L104
L78:
  orq    $0x0,-0x8(%rsp,%rcx,1)
  jmp    L34
  cs nopw 0x0(%rax,%rax,1)
L188:
  shr    %rbx
  pxor   %xmm2,%xmm2
  cvtsi2sd %rbx,%xmm2
  addsd  %xmm2,%xmm2
  jmp    L64
L152:
  pxor   %xmm1,%xmm1
  jmp    L59
L61:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
double fn2(int x) {
  double s = 0;
  double b[3 * x], c[3 * x], d[3 * x], e[3 * x];
  int i;
  fn1(b, c, x);
  fn1(e, d + x, x);
#pragma omp target map(to : b, c[:x], d [x:x], e) map(tofrom : s)
#pragma omp parallel for reduction(+ : s)
  for (i = 0; i < x; i++)
    s += b[i] * c[i] + d[x + i] + sizeof(b) - sizeof(c);
  return s;
}
```