user: 下面的汇编指令对应的C源代码是什么：

```asm
<longestPalindrome>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  mov    %rdi,%r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  call   <strlen@plt>
  lea    0x2(%rax),%r12d
  mov    %r12d,%edi
  call   <malloc@plt>
  mov    %r12d,%edi
  mov    %rax,%rbp
  call   <malloc@plt>
  lea    0x1(%rbp),%rdi
  mov    %r13,%rsi
  mov    %rax,%r12
  call   <strcpy@plt>
  movzbl 0x1(%rbp),%ecx
  movb   $0xff,0x0(%rbp)
  test   %cl,%cl
  je     L45
  mov    $0xffffffff,%r13d
  mov    $0x1,%ebx
  mov    $0x1,%r11d
  mov    $0x1,%r10d
  mov    $0x1,%r8d
  nopl   (%rax)
L196:
  movslq %r8d,%r9
  movzbl 0x1(%rbp,%r9,1),%eax
  lea    0x1(%r9),%rdx
  cmp    %cl,%al
  jne    L252
  movzbl 0x1(%rbp,%r9,1),%ecx
  nopl   0x0(%rax,%rax,1)
L204:
  mov    %rdx,%rsi
  mov    %ecx,%eax
  movslq %edx,%rdi
  add    $0x1,%rdx
  movzbl 0x1(%rbp,%rsi,1),%ecx
  cmp    %al,%cl
  je     L204
L49:
  cmp    %cl,%r13b
  jne    L176
  lea    0x1(%rdi),%r14d
  lea    0x0(%rbp,%r9,1),%rsi
  movslq %r14d,%rax
  lea    (%r8,%rdi,1),%r13d
  lea    -0x1(%rsi,%rdi,1),%r15
  nop
L30:
  mov    %r15,%rdi
  mov    %r13d,%r8d
  movzbl 0x1(%rbp,%rax,1),%esi
  mov    %eax,%r9d
  sub    %rax,%rdi
  sub    %eax,%r8d
  add    $0x1,%rax
  cmp    %sil,(%rdi)
  je     L30
L68:
  mov    %r9d,%eax
  sub    %r8d,%eax
  cmp    %r10d,%eax
  jl     L182
  lea    0x1(%rax),%r10d
  mov    %r9d,%ebx
  mov    %r8d,%r11d
L182:
  mov    %r14d,%r8d
  test   %cl,%cl
  je     L265
  movzbl -0x1(%rbp,%rdx,1),%r13d
  jmp    L196
  nopl   0x0(%rax)
L176:
  mov    %edi,%r9d
  lea    0x1(%rdi),%r14d
  jmp    L68
  nopl   0x0(%rax)
L252:
  mov    %eax,%ecx
  movslq %r8d,%rdi
  jmp    L49
  nop
L265:
  mov    %ebx,%edx
  sub    %r11d,%edx
  movslq %edx,%rsi
  add    $0x1,%rsi
  cmp    %ebx,%r11d
  jg     L119
  movslq %r11d,%rax
  mov    %r12,%rcx
  lea    0x0(%rbp,%rax,1),%rdi
  lea    0x1(%rdi),%r8
  sub    %r8,%rcx
  cmp    $0xe,%rcx
  jbe    L200
  cmp    $0x6,%edx
  jbe    L200
  lea    0x1(%rdx),%ecx
  cmp    $0xe,%edx
  jbe    L88
  mov    %ecx,%eax
  mov    %r12,%rdx
  shr    $0x4,%eax
  sub    %rdi,%rdx
  sub    $0x1,%eax
  shl    $0x4,%rax
  lea    0x10(%rdi,%rax,1),%r8
  mov    %rdi,%rax
L237:
  movdqu (%rax),%xmm0
  movups %xmm0,(%rdx,%rax,1)
  add    $0x10,%rax
  cmp    %r8,%rax
  jne    L237
  mov    %ecx,%edx
  and    $0xfffffff0,%edx
  lea    (%rdx,%r11,1),%eax
  cmp    %ecx,%edx
  je     L119
L66:
  sub    %edx,%ecx
  lea    -0x1(%rcx),%r8d
  cmp    $0x6,%r8d
  jbe    L74
  mov    (%rdi,%rdx,1),%rdi
  mov    %rdi,(%r12,%rdx,1)
  mov    %ecx,%edx
  and    $0xfffffff8,%edx
  add    %edx,%eax
  cmp    %edx,%ecx
  je     L119
L74:
  movslq %eax,%rdx
  movzbl 0x0(%rbp,%rdx,1),%ecx
  mov    %eax,%edx
  sub    %r11d,%edx
  movslq %edx,%rdx
  mov    %cl,(%r12,%rdx,1)
  lea    0x1(%rax),%edx
  cmp    %edx,%ebx
  jl     L119
  movslq %edx,%rcx
  sub    %r11d,%edx
  movzbl 0x0(%rbp,%rcx,1),%ecx
  movslq %edx,%rdx
  mov    %cl,(%r12,%rdx,1)
  lea    0x2(%rax),%edx
  cmp    %edx,%ebx
  jl     L119
  movslq %edx,%rcx
  sub    %r11d,%edx
  movzbl 0x0(%rbp,%rcx,1),%ecx
  movslq %edx,%rdx
  mov    %cl,(%r12,%rdx,1)
  lea    0x3(%rax),%edx
  cmp    %edx,%ebx
  jl     L119
  movslq %edx,%rcx
  sub    %r11d,%edx
  movzbl 0x0(%rbp,%rcx,1),%ecx
  movslq %edx,%rdx
  mov    %cl,(%r12,%rdx,1)
  lea    0x4(%rax),%edx
  cmp    %edx,%ebx
  jl     L119
  movslq %edx,%rcx
  sub    %r11d,%edx
  movzbl 0x0(%rbp,%rcx,1),%ecx
  movslq %edx,%rdx
  mov    %cl,(%r12,%rdx,1)
  lea    0x5(%rax),%edx
  cmp    %edx,%ebx
  jl     L119
  movslq %edx,%rcx
  sub    %r11d,%edx
  add    $0x6,%eax
  movzbl 0x0(%rbp,%rcx,1),%ecx
  movslq %edx,%rdx
  mov    %cl,(%r12,%rdx,1)
  cmp    %eax,%ebx
  jl     L119
  movslq %eax,%rdx
  sub    %r11d,%eax
  movzbl 0x0(%rbp,%rdx,1),%edx
  cltq
  mov    %dl,(%r12,%rax,1)
L119:
  movb   $0x0,(%r12,%rsi,1)
  mov    %rbp,%rdi
  call   <free@plt>
  add    $0x8,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L45:
  movb   $0x0,(%r12)
  mov    $0x1,%esi
  jmp    L119
L88:
  mov    %r11d,%eax
  xor    %edx,%edx
  jmp    L66
L200:
  mov    %r12,%rcx
  sub    %rax,%rcx
  nopl   (%rax)
L64:
  movzbl 0x0(%rbp,%rax,1),%edx
  mov    %dl,(%rcx,%rax,1)
  add    $0x1,%rax
  cmp    %eax,%ebx
  jge    L64
  jmp    L119
```

assistant: ```c
char *longestPalindrome(char *s) {
  int len = strlen(s);
  char *x = (char *)(malloc(sizeof(char) * (len + 2)));
  char *ans = (char *)(malloc(sizeof(char) * (len + 2)));
  strcpy(x + 1, s);
  int i;
  x[0] = -1;
  int ma = 1;
  int l, r;
  l = r = 1;
  for (i = 1; x[i]; ++i) {
    int s = i, e = i;
    while (x[e + 1] == x[e])
      ++e;
    i = e;
    while (x[s - 1] == x[e + 1])
      --s, ++e;
    if (e - s + 1 > ma) {
      ma = e - s + 1;
      l = s;
      r = e;
    }
  }
  for (i = l; i <= r; i++) {
    ans[i - l] = x[i];
  }
  ans[r - l + 1] = '\0';
  free(x);
  return ans;
}
```