user: Please show me the C implementation that matches the assembly code listed below:

```asm
<internal_fiat_25519_add>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xc0,%rsp
  mov    %rdi,-0xa8(%rbp)
  mov    %rsi,-0xb0(%rbp)
  mov    %rdx,-0xb8(%rbp)
  mov    -0xb0(%rbp),%rax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0xa0(%rbp)
  mov    -0xb0(%rbp),%rax
  add    $0x8,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x98(%rbp)
  mov    -0xb0(%rbp),%rax
  add    $0x10,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x90(%rbp)
  mov    -0xb0(%rbp),%rax
  add    $0x18,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x88(%rbp)
  mov    -0xb0(%rbp),%rax
  add    $0x20,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x80(%rbp)
  mov    -0xb8(%rbp),%rax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x78(%rbp)
  mov    -0xb8(%rbp),%rax
  add    $0x8,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x70(%rbp)
  mov    -0xb8(%rbp),%rax
  add    $0x10,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x68(%rbp)
  mov    -0xb8(%rbp),%rax
  add    $0x18,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x60(%rbp)
  mov    -0xb8(%rbp),%rax
  add    $0x20,%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <_br2_load@plt>
  mov    %rax,-0x58(%rbp)
  mov    -0xa0(%rbp),%rdx
  mov    -0x78(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x50(%rbp)
  mov    -0x98(%rbp),%rdx
  mov    -0x70(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x48(%rbp)
  mov    -0x90(%rbp),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x40(%rbp)
  mov    -0x88(%rbp),%rdx
  mov    -0x60(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x38(%rbp)
  mov    -0x80(%rbp),%rdx
  mov    -0x58(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x50(%rbp),%rax
  mov    %rax,-0x28(%rbp)
  mov    -0x48(%rbp),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x40(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x38(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x30(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0xa8(%rbp),%rax
  mov    %eax,%ecx
  mov    -0x28(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  mov    -0xa8(%rbp),%rax
  add    $0x8,%eax
  mov    %eax,%ecx
  mov    -0x20(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  mov    -0xa8(%rbp),%rax
  add    $0x10,%eax
  mov    %eax,%ecx
  mov    -0x18(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  mov    -0xa8(%rbp),%rax
  add    $0x18,%eax
  mov    %eax,%ecx
  mov    -0x10(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  mov    -0xa8(%rbp),%rax
  add    $0x20,%eax
  mov    %eax,%ecx
  mov    -0x8(%rbp),%rax
  mov    $0x8,%edx
  mov    %rax,%rsi
  mov    %ecx,%edi
  call   <_br2_store@plt>
  nop
  leave
  ret
```

assistant: ```c
void internal_fiat_25519_add(uintptr_t out0, uintptr_t in0, uintptr_t in1) {
  uintptr_t x0, x5, x1, x6, x2, x7, x3, x8, x4, x9, x10, x11, x12, x13, x14, x15, x16, x17, x18, x19;
  x0 = _br2_load((in0) + ((uintptr_t)0ULL), sizeof(uintptr_t));
  x1 = _br2_load((in0) + ((uintptr_t)8ULL), sizeof(uintptr_t));
  x2 = _br2_load((in0) + ((uintptr_t)16ULL), sizeof(uintptr_t));
  x3 = _br2_load((in0) + ((uintptr_t)24ULL), sizeof(uintptr_t));
  x4 = _br2_load((in0) + ((uintptr_t)32ULL), sizeof(uintptr_t));
  x5 = _br2_load((in1) + ((uintptr_t)0ULL), sizeof(uintptr_t));
  x6 = _br2_load((in1) + ((uintptr_t)8ULL), sizeof(uintptr_t));
  x7 = _br2_load((in1) + ((uintptr_t)16ULL), sizeof(uintptr_t));
  x8 = _br2_load((in1) + ((uintptr_t)24ULL), sizeof(uintptr_t));
  x9 = _br2_load((in1) + ((uintptr_t)32ULL), sizeof(uintptr_t));
  x10 = (x0) + (x5);
  x11 = (x1) + (x6);
  x12 = (x2) + (x7);
  x13 = (x3) + (x8);
  x14 = (x4) + (x9);
  x15 = x10;
  x16 = x11;
  x17 = x12;
  x18 = x13;
  x19 = x14;
  _br2_store((out0) + ((uintptr_t)0ULL), x15, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)8ULL), x16, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)16ULL), x17, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)24ULL), x18, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)32ULL), x19, sizeof(uintptr_t));
  return;
}
```