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

```asm
<internal_fiat_25519_add>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  mov    %rsi,%r12
  mov    $0x8,%esi
  push   %rbp
  mov    %rdx,%rbp
  push   %rbx
  mov    %rdi,%rbx
  mov    %r12d,%edi
  sub    $0x88,%rsp
  call   <_br2_load@plt>
  lea    0x4(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,(%rsp)
  call   <_br2_load@plt>
  lea    0x8(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,0x8(%rsp)
  call   <_br2_load@plt>
  lea    0xc(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,0x10(%rsp)
  call   <_br2_load@plt>
  lea    0x10(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,0x18(%rsp)
  call   <_br2_load@plt>
  lea    0x14(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,0x20(%rsp)
  call   <_br2_load@plt>
  lea    0x18(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,0x28(%rsp)
  call   <_br2_load@plt>
  lea    0x1c(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,0x30(%rsp)
  call   <_br2_load@plt>
  lea    0x20(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,0x38(%rsp)
  call   <_br2_load@plt>
  lea    0x24(%r12),%edi
  mov    $0x8,%esi
  mov    %rax,0x40(%rsp)
  call   <_br2_load@plt>
  mov    %ebp,%edi
  mov    $0x8,%esi
  mov    %rax,0x48(%rsp)
  call   <_br2_load@plt>
  lea    0x4(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,0x50(%rsp)
  call   <_br2_load@plt>
  lea    0x8(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,0x58(%rsp)
  call   <_br2_load@plt>
  lea    0xc(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,0x60(%rsp)
  call   <_br2_load@plt>
  lea    0x10(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,0x68(%rsp)
  call   <_br2_load@plt>
  lea    0x14(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,0x70(%rsp)
  call   <_br2_load@plt>
  lea    0x18(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,%r13
  call   <_br2_load@plt>
  lea    0x1c(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,%r15
  call   <_br2_load@plt>
  lea    0x20(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,%r14
  call   <_br2_load@plt>
  lea    0x24(%rbp),%edi
  mov    $0x8,%esi
  mov    %rax,%r12
  call   <_br2_load@plt>
  mov    0x48(%rsp),%r11
  mov    (%rsp),%rsi
  mov    %ebx,%edi
  mov    0x8(%rsp),%r10
  mov    0x10(%rsp),%r9
  mov    $0x8,%edx
  add    0x58(%rsp),%r10
  add    0x60(%rsp),%r9
  add    %rax,%r11
  add    0x50(%rsp),%rsi
  mov    0x18(%rsp),%r8
  mov    %r10,0x78(%rsp)
  add    0x68(%rsp),%r8
  add    0x28(%rsp),%r13
  mov    %r9,0x58(%rsp)
  add    0x30(%rsp),%r15
  add    0x38(%rsp),%r14
  mov    %r8,0x10(%rsp)
  add    0x40(%rsp),%r12
  mov    0x20(%rsp),%rbp
  mov    %r11,0x8(%rsp)
  add    0x70(%rsp),%rbp
  call   <_br2_store@plt>
  mov    0x78(%rsp),%rsi
  lea    0x4(%rbx),%edi
  mov    $0x8,%edx
  call   <_br2_store@plt>
  mov    0x58(%rsp),%rsi
  lea    0x8(%rbx),%edi
  mov    $0x8,%edx
  call   <_br2_store@plt>
  mov    0x10(%rsp),%rsi
  lea    0xc(%rbx),%edi
  mov    $0x8,%edx
  call   <_br2_store@plt>
  lea    0x10(%rbx),%edi
  mov    %rbp,%rsi
  mov    $0x8,%edx
  call   <_br2_store@plt>
  lea    0x14(%rbx),%edi
  mov    %r13,%rsi
  mov    $0x8,%edx
  call   <_br2_store@plt>
  lea    0x18(%rbx),%edi
  mov    %r15,%rsi
  mov    $0x8,%edx
  call   <_br2_store@plt>
  lea    0x1c(%rbx),%edi
  mov    %r14,%rsi
  mov    $0x8,%edx
  call   <_br2_store@plt>
  lea    0x20(%rbx),%edi
  mov    %r12,%rsi
  mov    $0x8,%edx
  call   <_br2_store@plt>
  mov    0x8(%rsp),%rsi
  lea    0x24(%rbx),%edi
  add    $0x88,%rsp
  pop    %rbx
  mov    $0x8,%edx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1060 <_br2_store@plt>
```

assistant: ```c
void internal_fiat_25519_add(uintptr_t out0, uintptr_t in0, uintptr_t in1) {
  uintptr_t x0, x10, x1, x11, x2, x12, x3, x13, x4, x14, x5, x15, x6, x16, x7, x17, x8, x18, x9, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, x29, x30, x31, x32, x33, x34, x35, x36, x37, x38, x39;
  x0 = _br2_load((in0) + ((uintptr_t)0ULL), sizeof(uintptr_t));
  x1 = _br2_load((in0) + ((uintptr_t)4ULL), sizeof(uintptr_t));
  x2 = _br2_load((in0) + ((uintptr_t)8ULL), sizeof(uintptr_t));
  x3 = _br2_load((in0) + ((uintptr_t)12ULL), sizeof(uintptr_t));
  x4 = _br2_load((in0) + ((uintptr_t)16ULL), sizeof(uintptr_t));
  x5 = _br2_load((in0) + ((uintptr_t)20ULL), sizeof(uintptr_t));
  x6 = _br2_load((in0) + ((uintptr_t)24ULL), sizeof(uintptr_t));
  x7 = _br2_load((in0) + ((uintptr_t)28ULL), sizeof(uintptr_t));
  x8 = _br2_load((in0) + ((uintptr_t)32ULL), sizeof(uintptr_t));
  x9 = _br2_load((in0) + ((uintptr_t)36ULL), sizeof(uintptr_t));
  x10 = _br2_load((in1) + ((uintptr_t)0ULL), sizeof(uintptr_t));
  x11 = _br2_load((in1) + ((uintptr_t)4ULL), sizeof(uintptr_t));
  x12 = _br2_load((in1) + ((uintptr_t)8ULL), sizeof(uintptr_t));
  x13 = _br2_load((in1) + ((uintptr_t)12ULL), sizeof(uintptr_t));
  x14 = _br2_load((in1) + ((uintptr_t)16ULL), sizeof(uintptr_t));
  x15 = _br2_load((in1) + ((uintptr_t)20ULL), sizeof(uintptr_t));
  x16 = _br2_load((in1) + ((uintptr_t)24ULL), sizeof(uintptr_t));
  x17 = _br2_load((in1) + ((uintptr_t)28ULL), sizeof(uintptr_t));
  x18 = _br2_load((in1) + ((uintptr_t)32ULL), sizeof(uintptr_t));
  x19 = _br2_load((in1) + ((uintptr_t)36ULL), sizeof(uintptr_t));
  x20 = (x0) + (x10);
  x21 = (x1) + (x11);
  x22 = (x2) + (x12);
  x23 = (x3) + (x13);
  x24 = (x4) + (x14);
  x25 = (x5) + (x15);
  x26 = (x6) + (x16);
  x27 = (x7) + (x17);
  x28 = (x8) + (x18);
  x29 = (x9) + (x19);
  x30 = x20;
  x31 = x21;
  x32 = x22;
  x33 = x23;
  x34 = x24;
  x35 = x25;
  x36 = x26;
  x37 = x27;
  x38 = x28;
  x39 = x29;
  _br2_store((out0) + ((uintptr_t)0ULL), x30, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)4ULL), x31, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)8ULL), x32, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)12ULL), x33, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)16ULL), x34, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)20ULL), x35, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)24ULL), x36, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)28ULL), x37, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)32ULL), x38, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)36ULL), x39, sizeof(uintptr_t));
  return;
}
```