user: What would the C source look like for the assembly code provided here:

```asm
<fn2>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  lea    (%rdi,%rdi,2),%r15d
  push   %r14
  movslq %r15d,%r15
  push   %r13
  shl    $0x3,%r15
  push   %r12
  push   %rbx
  mov    %edi,%ebx
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  lea    0xf(%r15),%rax
  mov    %rsp,%rcx
  mov    %rax,%rsi
  mov    %rax,%rdx
  and    $0xfffffffffffff000,%rsi
  and    $0xfffffffffffffff0,%rdx
  sub    %rsi,%rcx
  cmp    %rcx,%rsp
  je     L9
L42:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rcx,%rsp
  jne    L42
L9:
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  jne    L177
L127:
  mov    %rax,%rsi
  mov    %rsp,%rcx
  mov    %rax,%rdx
  mov    %rsp,%r12
  and    $0xfffffffffffff000,%rsi
  and    $0xfffffffffffffff0,%rdx
  sub    %rsi,%rcx
  cmp    %rcx,%rsp
  je     L1
L159:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rcx,%rsp
  jne    L159
L1:
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  jne    L98
L227:
  mov    %rax,%rsi
  mov    %rsp,%rcx
  mov    %rax,%rdx
  mov    %rsp,%r14
  and    $0xfffffffffffff000,%rsi
  and    $0xfffffffffffffff0,%rdx
  sub    %rsi,%rcx
  cmp    %rcx,%rsp
  je     L115
L10:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rcx,%rsp
  jne    L10
L115:
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  je     L186
  orq    $0x0,-0x8(%rsp,%rdx,1)
L186:
  mov    %rax,%rdx
  mov    %rsp,%rcx
  and    $0xfffffffffffff000,%rax
  mov    %rsp,%r13
  sub    %rax,%rcx
  and    $0xfffffffffffffff0,%rdx
  cmp    %rcx,%rsp
  je     L6
L154:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rcx,%rsp
  jne    L154
L6:
  mov    %rdx,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  je     L156
  orq    $0x0,-0x8(%rsp,%rax,1)
L156:
  mov    %rsp,%r8
  mov    %ebx,%edx
  mov    %r14,%rsi
  mov    %r12,%rdi
  mov    %r8,-0x50(%rbp)
  call   <fn1@plt>
  movslq %ebx,%rax
  mov    -0x50(%rbp),%rdi
  mov    %ebx,%edx
  lea    0x0(%r13,%rax,8),%rcx
  mov    %rcx,%rsi
  mov    %rcx,-0x48(%rbp)
  call   <fn1@plt>
  test   %ebx,%ebx
  jle    L117
  test   %r15,%r15
  mov    -0x48(%rbp),%rcx
  js     L185
  pxor   %xmm2,%xmm2
  cvtsi2sd %r15,%xmm2
L198:
  cmp    $0x1,%ebx
  je     L130
  mov    %ebx,%edx
  movapd %xmm2,%xmm3
  pxor   %xmm0,%xmm0
  xor    %eax,%eax
  shr    %edx
  unpcklpd %xmm3,%xmm3
  shl    $0x4,%rdx
  nopw   0x0(%rax,%rax,1)
L54:
  movupd (%r12,%rax,1),%xmm1
  movupd (%r14,%rax,1),%xmm5
  movupd (%rcx,%rax,1),%xmm6
  add    $0x10,%rax
  mulpd  %xmm5,%xmm1
  addpd  %xmm6,%xmm1
  addpd  %xmm3,%xmm1
  subpd  %xmm3,%xmm1
  addsd  %xmm1,%xmm0
  unpckhpd %xmm1,%xmm1
  addsd  %xmm1,%xmm0
  cmp    %rax,%rdx
  jne    L54
  mov    %ebx,%edx
  and    $0xfffffffe,%edx
  test   $0x1,%bl
  je     L136
L181:
  movslq %edx,%rax
  add    %edx,%ebx
  movsd  (%r14,%rax,8),%xmm1
  mulsd  (%r12,%rax,8),%xmm1
  movslq %ebx,%rbx
  addsd  0x0(%r13,%rbx,8),%xmm1
  addsd  %xmm2,%xmm1
  subsd  %xmm2,%xmm1
  addsd  %xmm1,%xmm0
L136:
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L223
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
  nopl   (%rax)
L177:
  orq    $0x0,-0x8(%rsp,%rdx,1)
  jmp    L127
L98:
  orq    $0x0,-0x8(%rsp,%rdx,1)
  jmp    L227
  xchg   %ax,%ax
L185:
  shr    %r15
  pxor   %xmm2,%xmm2
  cvtsi2sd %r15,%xmm2
  addsd  %xmm2,%xmm2
  jmp    L198
L117:
  pxor   %xmm0,%xmm0
  jmp    L136
L130:
  xor    %edx,%edx
  pxor   %xmm0,%xmm0
  jmp    L181
L223:
  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;
}
```