user: Demonstrate the C code that generates the assembly output below:

```asm
<swab>:
  endbr64
  push   %r15
  mov    %edx,%eax
  push   %r14
  sar    %eax
  push   %r13
  mov    %rdi,%r13
  push   %r12
  mov    %rsi,%r12
  push   %rbp
  push   %rbx
  sub    $0x40,%rsp
  and    $0xe,%edx
  je     L21
  nopl   0x0(%rax)
L8:
  movzbl 0x0(%r13),%edx
  add    $0x2,%r12
  sub    $0x1,%eax
  add    $0x2,%r13
  movzbl -0x1(%r13),%ecx
  mov    %cl,-0x2(%r12)
  mov    %dl,-0x1(%r12)
  test   $0x7,%al
  jne    L8
L21:
  sar    $0x3,%eax
  mov    %eax,-0x4c(%rsp)
  test   %eax,%eax
  jle    L39
  mov    %eax,%ebx
  mov    %eax,%esi
  cmp    $0xf,%eax
  jle    L5
  shr    $0x4,%ebx
  mov    %r13,%rax
  mov    %r12,%rdx
  movdqa D4(%rip),%xmm15
  mov    %ebx,%ecx
  sub    $0x1,%ecx
  shl    $0x8,%rcx
  lea    0x100(%r13,%rcx,1),%rcx
  nopw   0x0(%rax,%rax,1)
L31:
  movdqu (%rax),%xmm12
  movdqu (%rax),%xmm4
  add    $0x100,%rax
  add    $0x100,%rdx
  movdqu -0xf0(%rax),%xmm0
  movdqu -0x80(%rax),%xmm8
  pand   %xmm15,%xmm12
  psrlw  $0x8,%xmm4
  movdqu -0xe0(%rax),%xmm11
  movdqu -0xe0(%rax),%xmm3
  pand   %xmm15,%xmm0
  pand   %xmm15,%xmm8
  movdqu -0xc0(%rax),%xmm10
  movdqu -0xc0(%rax),%xmm2
  packuswb %xmm0,%xmm12
  pand   %xmm15,%xmm11
  movdqu -0xf0(%rax),%xmm0
  movdqu -0xa0(%rax),%xmm9
  psrlw  $0x8,%xmm3
  pand   %xmm15,%xmm10
  movdqu -0xa0(%rax),%xmm1
  movdqu -0x70(%rax),%xmm5
  psrlw  $0x8,%xmm0
  psrlw  $0x8,%xmm2
  pand   %xmm15,%xmm9
  movdqu -0x60(%rax),%xmm6
  psrlw  $0x8,%xmm1
  psrlw  $0x8,%xmm5
  packuswb %xmm0,%xmm4
  movdqu -0xd0(%rax),%xmm0
  psrlw  $0x8,%xmm6
  pand   %xmm15,%xmm0
  movdqa %xmm6,%xmm13
  packuswb %xmm0,%xmm11
  movdqu -0xd0(%rax),%xmm0
  psrlw  $0x8,%xmm0
  packuswb %xmm0,%xmm3
  movdqu -0xb0(%rax),%xmm0
  pand   %xmm15,%xmm0
  packuswb %xmm0,%xmm10
  movdqu -0xb0(%rax),%xmm0
  psrlw  $0x8,%xmm0
  packuswb %xmm0,%xmm2
  movdqu -0x90(%rax),%xmm0
  pand   %xmm15,%xmm0
  packuswb %xmm0,%xmm9
  movdqu -0x90(%rax),%xmm0
  psrlw  $0x8,%xmm0
  packuswb %xmm0,%xmm1
  movdqu -0x70(%rax),%xmm0
  pand   %xmm15,%xmm0
  packuswb %xmm0,%xmm8
  movdqu -0x80(%rax),%xmm0
  psrlw  $0x8,%xmm0
  movdqa %xmm0,%xmm7
  packuswb %xmm5,%xmm7
  movdqu -0x50(%rax),%xmm5
  movaps %xmm7,-0x78(%rsp)
  movdqu -0x60(%rax),%xmm7
  pand   %xmm15,%xmm5
  pand   %xmm15,%xmm7
  packuswb %xmm5,%xmm7
  movdqu -0x50(%rax),%xmm5
  psrlw  $0x8,%xmm5
  packuswb %xmm5,%xmm13
  movdqu -0x40(%rax),%xmm5
  movaps %xmm13,-0x68(%rsp)
  pand   %xmm15,%xmm5
  movdqa %xmm5,%xmm6
  movdqu -0x30(%rax),%xmm5
  pand   %xmm15,%xmm5
  packuswb %xmm5,%xmm6
  movdqu -0x40(%rax),%xmm5
  psrlw  $0x8,%xmm5
  movdqa %xmm5,%xmm13
  movdqu -0x30(%rax),%xmm5
  movdqa %xmm13,%xmm14
  psrlw  $0x8,%xmm5
  packuswb %xmm5,%xmm14
  movdqu -0x20(%rax),%xmm5
  movaps %xmm14,-0x48(%rsp)
  movdqu -0x10(%rax),%xmm0
  pand   %xmm15,%xmm5
  pand   %xmm15,%xmm0
  packuswb %xmm0,%xmm5
  movdqu -0x20(%rax),%xmm0
  psrlw  $0x8,%xmm0
  movdqa %xmm0,%xmm14
  movdqu -0x10(%rax),%xmm0
  psrlw  $0x8,%xmm0
  movdqa %xmm0,%xmm13
  movdqa %xmm14,%xmm0
  movdqa %xmm15,%xmm14
  packuswb %xmm13,%xmm0
  pand   %xmm12,%xmm14
  movdqa %xmm15,%xmm13
  psrlw  $0x8,%xmm12
  movaps %xmm0,-0x38(%rsp)
  pand   %xmm11,%xmm13
  movdqa %xmm12,%xmm0
  psrlw  $0x8,%xmm11
  movdqa %xmm15,%xmm12
  packuswb %xmm11,%xmm0
  movdqa %xmm15,%xmm11
  pand   %xmm9,%xmm12
  pand   %xmm10,%xmm11
  psrlw  $0x8,%xmm10
  packuswb %xmm13,%xmm14
  movaps %xmm0,-0x28(%rsp)
  packuswb %xmm12,%xmm11
  psrlw  $0x8,%xmm9
  movdqa %xmm10,%xmm12
  packuswb %xmm9,%xmm12
  movdqa %xmm15,%xmm10
  movdqa %xmm15,%xmm9
  pand   %xmm7,%xmm10
  pand   %xmm8,%xmm9
  movaps %xmm12,-0x18(%rsp)
  psrlw  $0x8,%xmm8
  psrlw  $0x8,%xmm7
  packuswb %xmm10,%xmm9
  movdqa %xmm8,%xmm10
  movdqa %xmm15,%xmm8
  packuswb %xmm7,%xmm10
  movdqa %xmm15,%xmm7
  pand   %xmm5,%xmm8
  pand   %xmm6,%xmm7
  psrlw  $0x8,%xmm6
  movaps %xmm10,-0x8(%rsp)
  movdqa %xmm15,%xmm10
  packuswb %xmm8,%xmm7
  psrlw  $0x8,%xmm5
  movdqa %xmm6,%xmm8
  packuswb %xmm5,%xmm8
  movdqa %xmm15,%xmm5
  movdqa %xmm15,%xmm6
  pand   %xmm4,%xmm5
  psrlw  $0x8,%xmm4
  pand   %xmm3,%xmm6
  movaps %xmm8,0x8(%rsp)
  psrlw  $0x8,%xmm3
  movdqa %xmm4,%xmm12
  packuswb %xmm6,%xmm5
  movdqa -0x68(%rsp),%xmm6
  packuswb %xmm3,%xmm12
  movdqa %xmm15,%xmm3
  movdqa -0x78(%rsp),%xmm4
  pand   %xmm1,%xmm10
  pand   %xmm2,%xmm3
  psrlw  $0x8,%xmm2
  movaps %xmm12,0x18(%rsp)
  psrlw  $0x8,%xmm1
  movdqa %xmm2,%xmm13
  movdqa %xmm6,%xmm2
  packuswb %xmm1,%xmm13
  movdqa %xmm15,%xmm1
  pand   %xmm15,%xmm2
  pand   %xmm4,%xmm1
  movdqa %xmm4,%xmm0
  packuswb %xmm10,%xmm3
  packuswb %xmm2,%xmm1
  psrlw  $0x8,%xmm0
  movdqa %xmm6,%xmm2
  psrlw  $0x8,%xmm2
  movdqa %xmm0,%xmm6
  packuswb %xmm2,%xmm6
  movdqa -0x48(%rsp),%xmm2
  movdqa %xmm6,%xmm12
  movdqa %xmm2,%xmm6
  psrlw  $0x8,%xmm2
  pand   %xmm15,%xmm6
  movdqa %xmm6,%xmm4
  movdqa -0x38(%rsp),%xmm6
  movdqa %xmm6,%xmm0
  pand   %xmm15,%xmm0
  packuswb %xmm0,%xmm4
  movdqa %xmm2,%xmm0
  movdqa %xmm6,%xmm2
  psrlw  $0x8,%xmm2
  packuswb %xmm2,%xmm0
  movdqa %xmm15,%xmm2
  pand   %xmm14,%xmm2
  movdqa %xmm2,%xmm8
  movdqa %xmm15,%xmm2
  pand   %xmm11,%xmm2
  psrlw  $0x8,%xmm11
  packuswb %xmm2,%xmm8
  movdqa %xmm14,%xmm2
  psrlw  $0x8,%xmm2
  movdqa %xmm2,%xmm6
  movdqa %xmm15,%xmm2
  pand   %xmm9,%xmm2
  psrlw  $0x8,%xmm9
  packuswb %xmm11,%xmm6
  movdqa %xmm2,%xmm10
  movdqa %xmm15,%xmm2
  movdqa %xmm9,%xmm14
  movaps %xmm6,-0x48(%rsp)
  pand   %xmm7,%xmm2
  psrlw  $0x8,%xmm7
  packuswb %xmm7,%xmm14
  packuswb %xmm2,%xmm10
  movdqa %xmm15,%xmm7
  movdqa %xmm15,%xmm2
  pand   %xmm3,%xmm7
  pand   %xmm5,%xmm2
  psrlw  $0x8,%xmm5
  packuswb %xmm7,%xmm2
  psrlw  $0x8,%xmm3
  movdqa %xmm5,%xmm7
  packuswb %xmm3,%xmm7
  movdqa %xmm15,%xmm5
  movdqa -0x28(%rsp),%xmm3
  movaps %xmm7,-0x38(%rsp)
  movdqa %xmm15,%xmm7
  pand   %xmm4,%xmm5
  pand   %xmm1,%xmm7
  psrlw  $0x8,%xmm1
  packuswb %xmm5,%xmm7
  psrlw  $0x8,%xmm4
  movdqa %xmm1,%xmm5
  packuswb %xmm4,%xmm5
  movdqa %xmm3,%xmm1
  movdqa -0x18(%rsp),%xmm4
  pand   %xmm15,%xmm1
  psrlw  $0x8,%xmm3
  movaps %xmm5,0x28(%rsp)
  movdqa %xmm1,%xmm6
  movdqa %xmm4,%xmm1
  movdqa %xmm3,%xmm9
  movdqa -0x8(%rsp),%xmm3
  pand   %xmm15,%xmm1
  packuswb %xmm1,%xmm6
  movdqa %xmm4,%xmm1
  movdqa 0x8(%rsp),%xmm4
  psrlw  $0x8,%xmm1
  packuswb %xmm1,%xmm9
  movdqa %xmm3,%xmm1
  pand   %xmm15,%xmm1
  psrlw  $0x8,%xmm3
  movaps %xmm9,-0x78(%rsp)
  movdqa %xmm1,%xmm5
  movdqa %xmm4,%xmm1
  movdqa %xmm3,%xmm11
  pand   %xmm15,%xmm1
  packuswb %xmm1,%xmm5
  movdqa %xmm4,%xmm1
  movdqa 0x18(%rsp),%xmm4
  psrlw  $0x8,%xmm1
  packuswb %xmm1,%xmm11
  movdqa %xmm4,%xmm3
  movdqa %xmm15,%xmm1
  pand   %xmm13,%xmm1
  psrlw  $0x8,%xmm4
  pand   %xmm15,%xmm3
  movaps %xmm11,-0x68(%rsp)
  packuswb %xmm1,%xmm3
  movdqa %xmm13,%xmm1
  movdqa %xmm4,%xmm13
  psrlw  $0x8,%xmm1
  movdqa %xmm15,%xmm4
  movdqa %xmm15,%xmm11
  packuswb %xmm1,%xmm13
  movdqa %xmm15,%xmm1
  pand   %xmm12,%xmm4
  pand   %xmm0,%xmm1
  psrlw  $0x8,%xmm0
  pand   %xmm3,%xmm11
  packuswb %xmm1,%xmm4
  psrlw  $0x8,%xmm3
  movdqa %xmm12,%xmm1
  movdqa 0x28(%rsp),%xmm12
  psrlw  $0x8,%xmm1
  packuswb %xmm0,%xmm1
  movdqa %xmm15,%xmm0
  pand   %xmm8,%xmm0
  psrlw  $0x8,%xmm8
  movdqa %xmm0,%xmm9
  movdqa %xmm15,%xmm0
  pand   %xmm10,%xmm0
  psrlw  $0x8,%xmm10
  packuswb %xmm0,%xmm9
  movdqa %xmm8,%xmm0
  movdqa %xmm15,%xmm8
  packuswb %xmm10,%xmm0
  pand   %xmm7,%xmm8
  movaps %xmm0,-0x28(%rsp)
  movdqa %xmm15,%xmm0
  psrlw  $0x8,%xmm7
  pand   %xmm2,%xmm0
  psrlw  $0x8,%xmm2
  packuswb %xmm8,%xmm0
  movdqa %xmm15,%xmm8
  packuswb %xmm7,%xmm2
  pand   %xmm6,%xmm8
  psrlw  $0x8,%xmm6
  movdqa %xmm15,%xmm7
  pand   %xmm5,%xmm7
  psrlw  $0x8,%xmm5
  movdqa %xmm8,%xmm10
  movdqa %xmm6,%xmm8
  movdqa -0x48(%rsp),%xmm6
  packuswb %xmm7,%xmm10
  packuswb %xmm5,%xmm8
  movdqa %xmm15,%xmm5
  pand   %xmm4,%xmm5
  psrlw  $0x8,%xmm4
  movaps %xmm8,-0x18(%rsp)
  packuswb %xmm4,%xmm3
  movdqa %xmm6,%xmm4
  packuswb %xmm5,%xmm11
  pand   %xmm15,%xmm4
  movdqa %xmm4,%xmm5
  movdqa %xmm15,%xmm4
  pand   %xmm14,%xmm4
  movdqa %xmm5,%xmm7
  packuswb %xmm4,%xmm7
  movdqa %xmm6,%xmm4
  movdqa -0x38(%rsp),%xmm6
  psrlw  $0x8,%xmm4
  movdqa %xmm4,%xmm5
  movdqa %xmm14,%xmm4
  psrlw  $0x8,%xmm4
  movdqa %xmm5,%xmm14
  movdqa %xmm12,%xmm5
  packuswb %xmm4,%xmm14
  movdqa %xmm6,%xmm4
  pand   %xmm15,%xmm5
  pand   %xmm15,%xmm4
  movdqa %xmm4,%xmm8
  movdqa -0x78(%rsp),%xmm4
  packuswb %xmm5,%xmm8
  movdqa %xmm6,%xmm5
  movdqa %xmm12,%xmm6
  psrlw  $0x8,%xmm6
  psrlw  $0x8,%xmm5
  pand   %xmm15,%xmm4
  movaps %xmm8,-0x48(%rsp)
  packuswb %xmm6,%xmm5
  movdqa -0x68(%rsp),%xmm6
  movdqa %xmm4,%xmm12
  movdqa -0x78(%rsp),%xmm4
  movdqa %xmm15,%xmm8
  pand   %xmm15,%xmm6
  psrlw  $0x8,%xmm4
  pand   %xmm13,%xmm8
  packuswb %xmm6,%xmm12
  movdqa -0x68(%rsp),%xmm6
  psrlw  $0x8,%xmm13
  psrlw  $0x8,%xmm6
  packuswb %xmm6,%xmm4
  movdqa %xmm15,%xmm6
  pand   %xmm1,%xmm6
  psrlw  $0x8,%xmm1
  movaps %xmm4,-0x78(%rsp)
  movdqa -0x18(%rsp),%xmm4
  packuswb %xmm1,%xmm13
  packuswb %xmm6,%xmm8
  movdqa %xmm0,%xmm1
  movdqa -0x28(%rsp),%xmm6
  punpcklbw %xmm2,%xmm1
  punpckhbw %xmm2,%xmm0
  movdqa %xmm9,%xmm2
  punpcklbw %xmm6,%xmm2
  punpckhbw %xmm6,%xmm9
  movdqa %xmm11,%xmm6
  punpcklbw %xmm3,%xmm6
  punpckhbw %xmm3,%xmm11
  movdqa %xmm10,%xmm3
  punpcklbw %xmm4,%xmm3
  punpckhbw %xmm4,%xmm10
  movdqa -0x48(%rsp),%xmm4
  movaps %xmm3,-0x68(%rsp)
  movdqa %xmm4,%xmm3
  punpckhbw %xmm5,%xmm4
  movaps %xmm10,-0x38(%rsp)
  punpcklbw %xmm5,%xmm3
  movdqa %xmm7,%xmm5
  punpckhbw %xmm14,%xmm7
  punpcklbw %xmm14,%xmm5
  movdqa %xmm12,%xmm14
  movdqa %xmm5,%xmm10
  movdqa %xmm8,%xmm5
  punpckhbw %xmm13,%xmm8
  punpcklbw %xmm13,%xmm5
  movdqa -0x78(%rsp),%xmm13
  punpckhbw %xmm13,%xmm12
  punpcklbw %xmm13,%xmm14
  movdqa %xmm12,%xmm13
  movdqa %xmm1,%xmm12
  punpckhbw %xmm3,%xmm1
  punpcklbw %xmm3,%xmm12
  movdqa %xmm0,%xmm3
  punpckhbw %xmm4,%xmm0
  punpcklbw %xmm4,%xmm3
  movdqa %xmm2,%xmm4
  punpckhbw %xmm10,%xmm2
  punpcklbw %xmm10,%xmm4
  movdqa %xmm9,%xmm10
  punpckhbw %xmm7,%xmm9
  punpcklbw %xmm7,%xmm10
  movdqa %xmm6,%xmm7
  punpckhbw %xmm5,%xmm6
  movaps %xmm9,-0x78(%rsp)
  punpcklbw %xmm5,%xmm7
  movdqa %xmm11,%xmm5
  punpckhbw %xmm8,%xmm11
  punpcklbw %xmm8,%xmm5
  movdqa -0x68(%rsp),%xmm8
  movdqa %xmm8,%xmm9
  punpckhbw %xmm14,%xmm8
  punpcklbw %xmm14,%xmm9
  movdqa -0x38(%rsp),%xmm14
  movaps %xmm8,-0x68(%rsp)
  movdqa %xmm14,%xmm8
  punpckhbw %xmm13,%xmm14
  punpcklbw %xmm13,%xmm8
  movdqa %xmm12,%xmm13
  punpckhbw %xmm7,%xmm12
  movaps %xmm14,-0x48(%rsp)
  punpcklbw %xmm7,%xmm13
  movdqa %xmm1,%xmm7
  punpckhbw %xmm6,%xmm1
  punpcklbw %xmm6,%xmm7
  movdqa %xmm3,%xmm6
  punpckhbw %xmm5,%xmm3
  punpcklbw %xmm5,%xmm6
  movdqa %xmm0,%xmm5
  movdqa %xmm4,%xmm14
  punpcklbw %xmm11,%xmm5
  punpckhbw %xmm11,%xmm0
  punpckhbw %xmm9,%xmm4
  movdqa -0x68(%rsp),%xmm11
  punpcklbw %xmm9,%xmm14
  movdqa %xmm2,%xmm9
  punpcklbw %xmm11,%xmm9
  punpckhbw %xmm11,%xmm2
  movdqa %xmm10,%xmm11
  movaps %xmm9,-0x68(%rsp)
  punpcklbw %xmm8,%xmm11
  punpckhbw %xmm8,%xmm10
  movdqa -0x78(%rsp),%xmm9
  movdqa -0x48(%rsp),%xmm8
  movaps %xmm11,-0x38(%rsp)
  movdqa %xmm10,%xmm11
  movdqa %xmm9,%xmm10
  punpcklbw %xmm8,%xmm10
  punpckhbw %xmm8,%xmm9
  movdqa %xmm13,%xmm8
  punpcklbw %xmm14,%xmm8
  punpckhbw %xmm14,%xmm13
  movups %xmm8,-0x100(%rdx)
  movdqa %xmm12,%xmm8
  punpcklbw %xmm4,%xmm8
  movups %xmm13,-0xf0(%rdx)
  movups %xmm8,-0xe0(%rdx)
  movdqa %xmm12,%xmm8
  movdqa -0x68(%rsp),%xmm12
  punpckhbw %xmm4,%xmm8
  movdqa %xmm7,%xmm4
  punpcklbw %xmm12,%xmm4
  punpckhbw %xmm12,%xmm7
  movups %xmm8,-0xd0(%rdx)
  movups %xmm4,-0xc0(%rdx)
  movdqa %xmm1,%xmm4
  punpckhbw %xmm2,%xmm1
  punpcklbw %xmm2,%xmm4
  movdqa -0x38(%rsp),%xmm2
  movups %xmm1,-0x90(%rdx)
  movdqa %xmm6,%xmm1
  movups %xmm7,-0xb0(%rdx)
  punpcklbw %xmm2,%xmm1
  punpckhbw %xmm2,%xmm6
  movups %xmm4,-0xa0(%rdx)
  movups %xmm1,-0x80(%rdx)
  movdqa %xmm3,%xmm1
  punpckhbw %xmm11,%xmm3
  punpcklbw %xmm11,%xmm1
  movups %xmm6,-0x70(%rdx)
  movups %xmm1,-0x60(%rdx)
  movdqa %xmm5,%xmm1
  punpckhbw %xmm10,%xmm5
  punpcklbw %xmm10,%xmm1
  movups %xmm3,-0x50(%rdx)
  movups %xmm1,-0x40(%rdx)
  movdqa %xmm0,%xmm1
  punpckhbw %xmm9,%xmm0
  punpcklbw %xmm9,%xmm1
  movups %xmm5,-0x30(%rdx)
  movups %xmm1,-0x20(%rdx)
  movups %xmm0,-0x10(%rdx)
  cmp    %rax,%rcx
  jne    L31
  mov    -0x4c(%rsp),%eax
  mov    %eax,%edx
  and    $0xfffffff0,%edx
  sub    %edx,%eax
  mov    %eax,-0x4c(%rsp)
  mov    %edx,%eax
  shl    $0x4,%rax
  add    %rax,%r13
  add    %rax,%r12
  cmp    %edx,%esi
  je     L39
  nopl   0x0(%rax)
L5:
  movzbl 0x6(%r13),%edx
  movzbl 0x7(%r13),%r15d
  add    $0x10,%r13
  add    $0x10,%r12
  movzbl -0xc(%r13),%r14d
  movzbl -0xb(%r13),%ebp
  shl    $0x8,%rdx
  movzbl -0xe(%r13),%ebx
  movzbl -0xd(%r13),%r11d
  or     %r15,%rdx
  movzbl -0x8(%r13),%eax
  movzbl -0x7(%r13),%edi
  shl    $0x8,%rdx
  movzbl -0x10(%r13),%r10d
  movzbl -0xf(%r13),%ecx
  or     %r14,%rdx
  mov    %al,-0x78(%rsp)
  movzbl -0x2(%r13),%eax
  shl    $0x8,%rdx
  mov    %dil,-0x68(%rsp)
  movzbl -0x5(%r13),%esi
  or     %rbp,%rdx
  movzbl -0x6(%r13),%edi
  movzbl -0x4(%r13),%r9d
  shl    $0x8,%rax
  shl    $0x8,%rdx
  movzbl -0x3(%r13),%r8d
  or     %rbx,%rdx
  shl    $0x8,%rdx
  or     %r11,%rdx
  movzbl %r10b,%r11d
  shl    $0x8,%rdx
  mov    %rdx,%r10
  movzbl -0x1(%r13),%edx
  or     %r11,%r10
  or     %rdx,%rax
  movzbl -0x78(%rsp),%edx
  shl    $0x8,%r10
  shl    $0x8,%rax
  or     %rcx,%r10
  or     %r9,%rax
  mov    %r10,-0x78(%rsp)
  shl    $0x8,%rax
  or     %r8,%rax
  shl    $0x8,%rax
  or     %rdi,%rax
  shl    $0x8,%rax
  or     %rsi,%rax
  shl    $0x8,%rax
  or     %rdx,%rax
  movzbl -0x68(%rsp),%edx
  shl    $0x8,%rax
  or     %rdx,%rax
  subl   $0x1,-0x4c(%rsp)
  mov    %rax,-0x70(%rsp)
  movdqa -0x78(%rsp),%xmm7
  movups %xmm7,-0x10(%r12)
  jne    L5
L39:
  add    $0x40,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: unpack_data
arguments: label: D4
data_type: byte[16]

tool: {"D4": [0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00,0xff,0x00]}

assistant: ```c
void swab(const void *__restrict from, void *__restrict to, ssize_t len) {
  unsigned long temp;
  int n;
  char *fp, *tp;
  n = len >> 1;
  fp = (char *)from;
  tp = (char *)to;
  for (; n & 0x7; --n)
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
  for (n >>= 3; n > 0; --n) {
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
    temp = *fp++, *tp++ = *fp++, *tp++ = temp;
  }
}
```