user: 下面的汇编指令对应的C源代码是什么：

```asm
<copyKey>:
  endbr64
  mov    %rdi,%rax
  mov    %rsi,%rcx
  and    $0xff,%edx
  je     L276
  lea    0x1(%rdi),%r9
  mov    %rcx,%rdi
  lea    -0x1(%rdx),%esi
  mov    %edx,%r8d
  sub    %r9,%rdi
  cmp    $0xe,%rdi
  jbe    L267
  cmp    $0x6,%esi
  jbe    L267
  cmp    $0xe,%esi
  jbe    L284
  movdqu (%rax),%xmm0
  mov    %edx,%esi
  shr    $0x4,%esi
  movups %xmm0,(%rcx)
  cmp    $0x1,%esi
  je     L243
  movdqu 0x10(%rax),%xmm1
  movups %xmm1,0x10(%rcx)
  cmp    $0x2,%esi
  je     L243
  movdqu 0x20(%rax),%xmm2
  movups %xmm2,0x20(%rcx)
  cmp    $0x3,%esi
  je     L243
  movdqu 0x30(%rax),%xmm3
  movups %xmm3,0x30(%rcx)
  cmp    $0x4,%esi
  je     L243
  movdqu 0x40(%rax),%xmm4
  movups %xmm4,0x40(%rcx)
  cmp    $0x5,%esi
  je     L243
  movdqu 0x50(%rax),%xmm5
  movups %xmm5,0x50(%rcx)
  cmp    $0x6,%esi
  je     L243
  movdqu 0x60(%rax),%xmm6
  movups %xmm6,0x60(%rcx)
  cmp    $0x7,%esi
  je     L243
  movdqu 0x70(%rax),%xmm7
  movups %xmm7,0x70(%rcx)
  cmp    $0x8,%esi
  je     L243
  movdqu 0x80(%rax),%xmm7
  movups %xmm7,0x80(%rcx)
  cmp    $0x9,%esi
  je     L243
  movdqu 0x90(%rax),%xmm6
  movups %xmm6,0x90(%rcx)
  cmp    $0xa,%esi
  je     L243
  movdqu 0xa0(%rax),%xmm5
  movups %xmm5,0xa0(%rcx)
  cmp    $0xb,%esi
  je     L243
  movdqu 0xb0(%rax),%xmm4
  movups %xmm4,0xb0(%rcx)
  cmp    $0xc,%esi
  je     L243
  movdqu 0xc0(%rax),%xmm7
  movups %xmm7,0xc0(%rcx)
  cmp    $0xd,%esi
  je     L243
  movdqu 0xd0(%rax),%xmm6
  movups %xmm6,0xd0(%rcx)
  cmp    $0xf,%esi
  jne    L243
  movdqu 0xe0(%rax),%xmm5
  movups %xmm5,0xe0(%rcx)
  nopl   0x0(%rax)
L243:
  mov    %edx,%edi
  and    $0xfffffff0,%edi
  mov    %edi,%esi
  cmp    %edi,%edx
  je     L276
  mov    %edx,%r8d
  sub    %edi,%r8d
  lea    -0x1(%r8),%r9d
  cmp    $0x6,%r9d
  jbe    L251
L237:
  mov    (%rax,%rdi,1),%r9
  mov    %r9,(%rcx,%rdi,1)
  mov    %r8d,%edi
  and    $0xfffffff8,%edi
  add    %edi,%esi
  cmp    %r8d,%edi
  je     L276
L251:
  movslq %esi,%rdi
  movzbl (%rax,%rdi,1),%r8d
  mov    %r8b,(%rcx,%rdi,1)
  lea    0x1(%rsi),%edi
  cmp    %edi,%edx
  jle    L276
  movslq %edi,%rdi
  movzbl (%rax,%rdi,1),%r8d
  mov    %r8b,(%rcx,%rdi,1)
  lea    0x2(%rsi),%edi
  cmp    %edi,%edx
  jle    L276
  movslq %edi,%rdi
  movzbl (%rax,%rdi,1),%r8d
  mov    %r8b,(%rcx,%rdi,1)
  lea    0x3(%rsi),%edi
  cmp    %edi,%edx
  jle    L276
  movslq %edi,%rdi
  movzbl (%rax,%rdi,1),%r8d
  mov    %r8b,(%rcx,%rdi,1)
  lea    0x4(%rsi),%edi
  cmp    %edi,%edx
  jle    L276
  movslq %edi,%rdi
  movzbl (%rax,%rdi,1),%r8d
  mov    %r8b,(%rcx,%rdi,1)
  lea    0x5(%rsi),%edi
  cmp    %edi,%edx
  jle    L276
  movslq %edi,%rdi
  add    $0x6,%esi
  movzbl (%rax,%rdi,1),%r8d
  mov    %r8b,(%rcx,%rdi,1)
  cmp    %esi,%edx
  jle    L276
  movslq %esi,%rsi
  movzbl (%rax,%rsi,1),%eax
  mov    %al,(%rcx,%rsi,1)
  ret
  nopl   0x0(%rax)
L267:
  xor    %esi,%esi
  nopw   0x0(%rax,%rax,1)
L92:
  movzbl (%rax,%rsi,1),%edi
  mov    %dil,(%rcx,%rsi,1)
  add    $0x1,%rsi
  cmp    %esi,%edx
  jg     L92
L276:
  ret
L284:
  xor    %edi,%edi
  xor    %esi,%esi
  jmp    L237
```

assistant: ```c
void copyKey(const unsigned char *from, unsigned char *to, const unsigned char keyLen) {
  int i;
  for (i = 0; i < keyLen; i++) {
    to[i] = from[i];
  }
}
```