user: Demonstrate the C code that generates the assembly output below:

```asm
<pd_add>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %rdx,-0x58(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x20,%rax
  movsd  (%rax),%xmm0
  mov    -0x48(%rbp),%rax
  add    $0x20,%rax
  mov    (%rax),%rax
  lea    -0x40(%rbp),%rdx
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x30(%rbp)
  movsd  -0x40(%rbp),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm0
  mov    -0x48(%rbp),%rax
  add    $0x18,%rax
  mov    (%rax),%rax
  lea    -0x40(%rbp),%rdx
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x28(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x30(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x30(%rbp)
  movsd  -0x40(%rbp),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm0
  mov    -0x48(%rbp),%rax
  add    $0x10,%rax
  mov    (%rax),%rax
  lea    -0x40(%rbp),%rdx
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x20(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x28(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x30(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x30(%rbp)
  movsd  -0x40(%rbp),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x50(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  mov    -0x48(%rbp),%rax
  add    $0x8,%rax
  mov    (%rax),%rax
  lea    -0x40(%rbp),%rdx
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x18(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x20(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x28(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x30(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x30(%rbp)
  movsd  -0x40(%rbp),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x50(%rbp),%rax
  movsd  (%rax),%xmm0
  mov    -0x48(%rbp),%rax
  mov    (%rax),%rax
  lea    -0x40(%rbp),%rdx
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x10(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x18(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x20(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x20(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x28(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x28(%rbp)
  movsd  -0x40(%rbp),%xmm0
  lea    -0x40(%rbp),%rdx
  mov    -0x30(%rbp),%rax
  mov    %rdx,%rdi
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <dd_two_sum@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x30(%rbp)
  movsd  -0x40(%rbp),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x58(%rbp),%rax
  lea    0x20(%rax),%r8
  mov    -0x58(%rbp),%rax
  lea    0x18(%rax),%rcx
  mov    -0x58(%rbp),%rax
  lea    0x10(%rax),%rdx
  mov    -0x58(%rbp),%rax
  lea    0x8(%rax),%rsi
  mov    -0x58(%rbp),%rdi
  movsd  -0x38(%rbp),%xmm4
  movsd  -0x30(%rbp),%xmm3
  movsd  -0x28(%rbp),%xmm2
  movsd  -0x20(%rbp),%xmm1
  movsd  -0x18(%rbp),%xmm0
  mov    -0x10(%rbp),%rax
  movapd %xmm4,%xmm5
  movapd %xmm3,%xmm4
  movapd %xmm2,%xmm3
  movapd %xmm1,%xmm2
  movapd %xmm0,%xmm1
  movq   %rax,%xmm0
  call   <pd_fast_renorm@plt>
  nop
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L6
  call   <__stack_chk_fail@plt>
L6:
  leave
  ret
```

assistant: ```c
void pd_add(const double *a, const double *b, double *c) {
  double f0, f1, f2, f3, f4, f5, e;
  f5 = 0.0;
  f4 = dd_two_sum(a[4], b[4], &e);
  f5 = f5 + e;
  f3 = dd_two_sum(a[3], b[3], &e);
  f4 = dd_two_sum(f4, e, &e);
  f5 = f5 + e;
  f2 = dd_two_sum(a[2], b[2], &e);
  f3 = dd_two_sum(f3, e, &e);
  f4 = dd_two_sum(f4, e, &e);
  f5 = f5 + e;
  f1 = dd_two_sum(a[1], b[1], &e);
  f2 = dd_two_sum(f2, e, &e);
  f3 = dd_two_sum(f3, e, &e);
  f4 = dd_two_sum(f4, e, &e);
  f5 = f5 + e;
  f0 = dd_two_sum(a[0], b[0], &e);
  f1 = dd_two_sum(f1, e, &e);
  f2 = dd_two_sum(f2, e, &e);
  f3 = dd_two_sum(f3, e, &e);
  f4 = dd_two_sum(f4, e, &e);
  f5 = f5 + e;
  pd_fast_renorm(f0, f1, f2, f3, f4, f5, &c[0], &c[1], &c[2], &c[3], &c[4]);
}
```