user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<bar>:
  endbr64
  mov    %rsi,%rcx
  mov    %edx,%esi
  test   %esi,%esi
  jle    L160
  lea    0x1f(%rcx),%rdx
  mov    %rdi,%rax
  sub    %rdi,%rdx
  cmp    $0x3e,%rdx
  jbe    L30
  lea    -0x1(%rsi),%edx
  cmp    $0xe,%edx
  jbe    L30
  mov    %esi,%r8d
  movdqa D5(%rip),%xmm4
  mov    %rcx,%rdx
  shr    $0x4,%r8d
  sub    $0x1,%r8d
  shl    $0x5,%r8
  lea    0x20(%rcx,%r8,1),%r8
L18:
  movdqu (%rdx),%xmm1
  movdqa %xmm4,%xmm3
  movdqa %xmm4,%xmm0
  add    $0x20,%rdx
  movdqu -0x10(%rdx),%xmm2
  add    $0x20,%rdi
  movdqa %xmm1,%xmm6
  psllw  $0x8,%xmm1
  movdqa %xmm2,%xmm5
  psrlw  $0x8,%xmm6
  psrlw  $0x8,%xmm5
  psllw  $0x8,%xmm2
  pand   %xmm6,%xmm3
  pand   %xmm5,%xmm0
  por    %xmm5,%xmm2
  packuswb %xmm0,%xmm3
  psrlw  $0x8,%xmm2
  movdqa %xmm1,%xmm0
  por    %xmm6,%xmm0
  pand   %xmm4,%xmm2
  movdqa %xmm3,%xmm1
  psrlw  $0x8,%xmm0
  pand   %xmm4,%xmm0
  packuswb %xmm2,%xmm0
  punpcklbw %xmm0,%xmm1
  punpckhbw %xmm0,%xmm3
  movups %xmm1,-0x20(%rdi)
  movups %xmm3,-0x10(%rdi)
  cmp    %rdx,%r8
  jne    L18
  mov    %esi,%edi
  and    $0xfffffff0,%edi
  test   $0xf,%sil
  je     L160
  mov    %edi,%r9d
  push   %rbx
  lea    (%r9,%r9,1),%rdx
  lea    (%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  movzbl %bh,%ebx
  mov    %bl,(%rax,%r9,2)
  movzbl (%r8),%r8d
  mov    %r8b,0x1(%rax,%rdx,1)
  lea    0x1(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x2(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x2(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x3(%rax,%rdx,1)
  lea    0x2(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x4(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x4(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x5(%rax,%rdx,1)
  lea    0x3(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x6(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x6(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x7(%rax,%rdx,1)
  lea    0x4(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x8(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x8(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x9(%rax,%rdx,1)
  lea    0x5(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0xa(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0xa(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0xb(%rax,%rdx,1)
  lea    0x6(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0xc(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0xc(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0xd(%rax,%rdx,1)
  lea    0x7(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0xe(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0xe(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0xf(%rax,%rdx,1)
  lea    0x8(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x10(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x10(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x11(%rax,%rdx,1)
  lea    0x9(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x12(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x12(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x13(%rax,%rdx,1)
  lea    0xa(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x14(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x14(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x15(%rax,%rdx,1)
  lea    0xb(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x16(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x16(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x17(%rax,%rdx,1)
  lea    0xc(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x18(%rcx,%rdx,1),%r8
  movzwl (%r8),%ebx
  mov    %bh,0x18(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x19(%rax,%rdx,1)
  lea    0xd(%rdi),%r8d
  cmp    %r8d,%esi
  jle    L6
  lea    0x1a(%rcx,%rdx,1),%r8
  add    $0xe,%edi
  movzwl (%r8),%ebx
  mov    %bh,0x1a(%rax,%rdx,1)
  movzbl (%r8),%r8d
  mov    %r8b,0x1b(%rax,%rdx,1)
  cmp    %edi,%esi
  jle    L6
  lea    0x1c(%rcx,%rdx,1),%rcx
  movzwl (%rcx),%ebx
  mov    %bh,0x1c(%rax,%rdx,1)
  movzbl (%rcx),%ecx
  mov    %cl,0x1d(%rax,%rdx,1)
L6:
  pop    %rbx
  ret
  nopw   0x0(%rax,%rax,1)
L30:
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L122:
  movzbl 0x1(%rcx,%rdx,2),%edi
  mov    %dil,(%rax,%rdx,2)
  movzbl (%rcx,%rdx,2),%edi
  mov    %dil,0x1(%rax,%rdx,2)
  add    $0x1,%rdx
  cmp    %rdx,%rsi
  jne    L122
  ret
  nopl   0x0(%rax)
L160:
  ret
```

tool_calls: name: retrieve_data
arguments: label: D5
type_guessed: byte[16]

tool: {"D5": [0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00]}

assistant: ```c
void bar(unsigned char *q, unsigned short *data16s, int len) {
  int i;
  for (i = 0; i < len; i++) {
    q[2 * i] = (((data16s[i] & 0xFF) << 8) | ((data16s[i] >> 8) & 0xFF)) & 0xFF;
    q[2 * i + 1] = ((unsigned short)(((data16s[i] & 0xFF) << 8) | ((data16s[i] >> 8) & 0xFF))) >> 8;
  }
}
```