user: 请从给定的汇编指令推导出C源代码:

```asm
<simple_update>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    %rcx,-0x30(%rbp)
  movl   $0x40,-0x8(%rbp)
  jmp    L4
L78:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rsi
  mov    -0x28(%rbp),%rax
  add    %rsi,%rax
  add    %ecx,%edx
  mov    %edx,(%rax)
L4:
  mov    -0x8(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x8(%rbp)
  test   %eax,%eax
  jne    L78
  addq   $0x100,-0x18(%rbp)
  addq   $0x100,-0x20(%rbp)
  addq   $0x100,-0x28(%rbp)
  movl   $0x1,-0x4(%rbp)
  jmp    L48
L136:
  mov    -0x4(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  test   %eax,%eax
  jne    L29
  movl   $0x40,-0x8(%rbp)
  jmp    L133
L33:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rsi
  mov    -0x28(%rbp),%rax
  add    %rsi,%rax
  add    %ecx,%edx
  mov    %edx,(%rax)
L133:
  mov    -0x8(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x8(%rbp)
  test   %eax,%eax
  jne    L33
  addq   $0x100,-0x18(%rbp)
  addq   $0x100,-0x20(%rbp)
L29:
  mov    -0x4(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  and    $0x1,%eax
  test   %eax,%eax
  je     L129
  movl   $0x40,-0x8(%rbp)
  jmp    L47
L86:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    -0x8(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x28(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
L47:
  mov    -0x8(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x8(%rbp)
  test   %eax,%eax
  jne    L86
  addq   $0x100,-0x20(%rbp)
L129:
  mov    -0x4(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  and    $0x2,%eax
  test   %eax,%eax
  je     L13
  movl   $0x40,-0x8(%rbp)
  jmp    L49
L44:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    -0x8(%rbp),%edx
  movslq %edx,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x28(%rbp),%rdx
  add    %rcx,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
L49:
  mov    -0x8(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x8(%rbp)
  test   %eax,%eax
  jne    L44
  addq   $0x100,-0x18(%rbp)
L13:
  addq   $0x100,-0x28(%rbp)
  addl   $0x1,-0x4(%rbp)
L48:
  mov    -0x4(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%eax
  cmp    $0x3,%eax
  jne    L136
  movl   $0x40,-0x8(%rbp)
  jmp    L137
L53:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%edx
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rsi
  mov    -0x28(%rbp),%rax
  add    %rsi,%rax
  add    %ecx,%edx
  mov    %edx,(%rax)
L137:
  mov    -0x8(%rbp),%eax
  lea    -0x1(%rax),%edx
  mov    %edx,-0x8(%rbp)
  test   %eax,%eax
  jne    L53
  mov    -0x30(%rbp),%rax
  mov    (%rax),%eax
  add    $0x1,%eax
  shl    $0x6,%eax
  cltq
  shl    $0x2,%rax
  neg    %rax
  add    %rax,-0x28(%rbp)
  mov    -0x28(%rbp),%rax
  pop    %rbp
  ret
```

assistant: ```c
int *simple_update(int *profa, int *profb, int *newp, int *path) {
  int i, c;
  for (i = 64; i--;) {
    newp[i] = profa[i] + profb[i];
  }
  profa += 64;
  profb += 64;
  newp += 64;
  c = 1;
  while (path[c] != 3) {
    if (!path[c]) {
      for (i = 64; i--;) {
        newp[i] = profa[i] + profb[i];
      }
      profa += 64;
      profb += 64;
    }
    if (path[c] & 1) {
      for (i = 64; i--;) {
        newp[i] = profb[i];
      }
      profb += 64;
    }
    if (path[c] & 2) {
      for (i = 64; i--;) {
        newp[i] = profa[i];
      }
      profa += 64;
    }
    newp += 64;
    c++;
  }
  for (i = 64; i--;) {
    newp[i] = profa[i] + profb[i];
  }
  newp -= (path[0] + 1) * 64;
  return newp;
}
```