user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<internal_fiat_p448_add>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,%r14
  mov    %rsi,%rbp
  mov    %rdx,%rbx
  mov    $0x8,%esi
  mov    %ebp,%edi
  call   <_br2_load@plt>
  mov    %rax,0x8(%rsp)
  lea    0x8(%rbp),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x10(%rsp)
  lea    0x10(%rbp),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x18(%rsp)
  lea    0x18(%rbp),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x20(%rsp)
  lea    0x20(%rbp),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x28(%rsp)
  lea    0x28(%rbp),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x30(%rsp)
  lea    0x30(%rbp),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x38(%rsp)
  lea    0x38(%rbp),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x40(%rsp)
  mov    $0x8,%esi
  mov    %ebx,%edi
  call   <_br2_load@plt>
  mov    %rax,0x48(%rsp)
  lea    0x8(%rbx),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,%r15
  lea    0x10(%rbx),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x50(%rsp)
  lea    0x18(%rbx),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,0x58(%rsp)
  lea    0x20(%rbx),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,%r13
  lea    0x28(%rbx),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,%r12
  lea    0x30(%rbx),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  mov    %rax,%rbp
  lea    0x38(%rbx),%edi
  mov    $0x8,%esi
  call   <_br2_load@plt>
  add    0x10(%rsp),%r15
  mov    0x18(%rsp),%rcx
  add    0x50(%rsp),%rcx
  mov    %rcx,0x10(%rsp)
  mov    0x20(%rsp),%rdx
  add    0x58(%rsp),%rdx
  mov    %rdx,0x18(%rsp)
  add    0x28(%rsp),%r13
  add    0x30(%rsp),%r12
  add    0x38(%rsp),%rbp
  mov    0x40(%rsp),%rbx
  add    %rax,%rbx
  mov    0x8(%rsp),%rdi
  add    0x48(%rsp),%rdi
  mov    %rdi,%rsi
  mov    $0x8,%edx
  mov    %r14d,%edi
  call   <_br2_store@plt>
  lea    0x8(%r14),%edi
  mov    $0x8,%edx
  mov    %r15,%rsi
  call   <_br2_store@plt>
  lea    0x10(%r14),%edi
  mov    $0x8,%edx
  mov    0x10(%rsp),%rsi
  call   <_br2_store@plt>
  lea    0x18(%r14),%edi
  mov    $0x8,%edx
  mov    0x18(%rsp),%rsi
  call   <_br2_store@plt>
  lea    0x20(%r14),%edi
  mov    $0x8,%edx
  mov    %r13,%rsi
  call   <_br2_store@plt>
  lea    0x28(%r14),%edi
  mov    $0x8,%edx
  mov    %r12,%rsi
  call   <_br2_store@plt>
  lea    0x30(%r14),%edi
  mov    $0x8,%edx
  mov    %rbp,%rsi
  call   <_br2_store@plt>
  lea    0x38(%r14),%edi
  mov    $0x8,%edx
  mov    %rbx,%rsi
  call   <_br2_store@plt>
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void internal_fiat_p448_add(uintptr_t out0, uintptr_t in0, uintptr_t in1) {
  uintptr_t x0, x8, x1, x9, x2, x10, x3, x11, x4, x12, x5, x13, x6, x14, x7, x15, x16, x17, x18, x19, x20, x21, x22, x23, x24, x25, x26, x27, x28, x29, x30, x31;
  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((in0) + ((uintptr_t)40ULL), sizeof(uintptr_t));
  x6 = _br2_load((in0) + ((uintptr_t)48ULL), sizeof(uintptr_t));
  x7 = _br2_load((in0) + ((uintptr_t)56ULL), sizeof(uintptr_t));
  x8 = _br2_load((in1) + ((uintptr_t)0ULL), sizeof(uintptr_t));
  x9 = _br2_load((in1) + ((uintptr_t)8ULL), sizeof(uintptr_t));
  x10 = _br2_load((in1) + ((uintptr_t)16ULL), sizeof(uintptr_t));
  x11 = _br2_load((in1) + ((uintptr_t)24ULL), sizeof(uintptr_t));
  x12 = _br2_load((in1) + ((uintptr_t)32ULL), sizeof(uintptr_t));
  x13 = _br2_load((in1) + ((uintptr_t)40ULL), sizeof(uintptr_t));
  x14 = _br2_load((in1) + ((uintptr_t)48ULL), sizeof(uintptr_t));
  x15 = _br2_load((in1) + ((uintptr_t)56ULL), sizeof(uintptr_t));
  x16 = (x0) + (x8);
  x17 = (x1) + (x9);
  x18 = (x2) + (x10);
  x19 = (x3) + (x11);
  x20 = (x4) + (x12);
  x21 = (x5) + (x13);
  x22 = (x6) + (x14);
  x23 = (x7) + (x15);
  x24 = x16;
  x25 = x17;
  x26 = x18;
  x27 = x19;
  x28 = x20;
  x29 = x21;
  x30 = x22;
  x31 = x23;
  _br2_store((out0) + ((uintptr_t)0ULL), x24, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)8ULL), x25, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)16ULL), x26, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)24ULL), x27, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)32ULL), x28, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)40ULL), x29, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)48ULL), x30, sizeof(uintptr_t));
  _br2_store((out0) + ((uintptr_t)56ULL), x31, sizeof(uintptr_t));
  return;
}
```