user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<tpdec2>:
  endbr64
  mov    %esi,%r8d
  mov    %esi,%r11d
  and    $0xfffffffe,%esi
  push   %r13
  lea    (%rdx,%rsi,1),%r10
  push   %r12
  mov    %rdi,%rcx
  shr    %r8d
  push   %rbp
  push   %rbx
  cmp    %r10,%rdx
  jae    L3
  lea    -0x1(%rsi),%r12
  lea    (%rcx,%r8,1),%r9
  mov    %r12,%rax
  shr    %rax
  lea    0x1(%rax),%rbp
  lea    0x1(%r8,%rax,1),%rax
  add    %rcx,%rax
  lea    (%rdx,%rbp,2),%rdi
  cmp    %rax,%rdx
  setae  %bl
  cmp    %r9,%rdi
  setbe  %al
  or     %eax,%ebx
  lea    (%rcx,%rbp,1),%rax
  cmp    %rax,%rdx
  setae  %al
  cmp    %rdi,%rcx
  setae  %r13b
  or     %r13d,%eax
  test   %al,%bl
  je     L378
  cmp    $0x1d,%r12
  jbe    L378
  mov    %rbp,%rbx
  xor    %eax,%eax
  and    $0xfffffffffffffff0,%rbx
  nopl   0x0(%rax)
L106:
  movdqu (%rcx,%rax,1),%xmm0
  movdqu (%r9,%rax,1),%xmm1
  movdqa %xmm0,%xmm2
  punpckhbw %xmm1,%xmm0
  punpcklbw %xmm1,%xmm2
  movups %xmm0,0x10(%rdx,%rax,2)
  movups %xmm2,(%rdx,%rax,2)
  add    $0x10,%rax
  cmp    %rbx,%rax
  jne    L106
  mov    %rbp,%rbx
  and    $0xfffffffffffffff0,%rbx
  lea    (%rdx,%rbx,2),%rax
  lea    (%rcx,%rbx,1),%r9
  cmp    %rbx,%rbp
  je     L54
  movzbl (%r9),%ebx
  mov    %bl,(%rax)
  movzbl (%r9,%r8,1),%ebx
  mov    %bl,0x1(%rax)
  lea    0x2(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x1(%r9),%ebx
  mov    %bl,0x2(%rax)
  movzbl 0x1(%r9,%r8,1),%ebx
  mov    %bl,0x3(%rax)
  lea    0x4(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x2(%r9),%ebx
  mov    %bl,0x4(%rax)
  movzbl 0x2(%r9,%r8,1),%ebx
  mov    %bl,0x5(%rax)
  lea    0x6(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x3(%r9),%ebx
  mov    %bl,0x6(%rax)
  movzbl 0x3(%r9,%r8,1),%ebx
  mov    %bl,0x7(%rax)
  lea    0x8(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x4(%r9),%ebx
  mov    %bl,0x8(%rax)
  movzbl 0x4(%r9,%r8,1),%ebx
  mov    %bl,0x9(%rax)
  lea    0xa(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x5(%r9),%ebx
  mov    %bl,0xa(%rax)
  movzbl 0x5(%r9,%r8,1),%ebx
  mov    %bl,0xb(%rax)
  lea    0xc(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x6(%r9),%ebx
  mov    %bl,0xc(%rax)
  movzbl 0x6(%r9,%r8,1),%ebx
  mov    %bl,0xd(%rax)
  lea    0xe(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x7(%r9),%ebx
  mov    %bl,0xe(%rax)
  movzbl 0x7(%r9,%r8,1),%ebx
  mov    %bl,0xf(%rax)
  lea    0x10(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x8(%r9),%ebx
  mov    %bl,0x10(%rax)
  movzbl 0x8(%r9,%r8,1),%ebx
  mov    %bl,0x11(%rax)
  lea    0x12(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0x9(%r9),%ebx
  mov    %bl,0x12(%rax)
  movzbl 0x9(%r9,%r8,1),%ebx
  mov    %bl,0x13(%rax)
  lea    0x14(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0xa(%r9),%ebx
  mov    %bl,0x14(%rax)
  movzbl 0xa(%r9,%r8,1),%ebx
  mov    %bl,0x15(%rax)
  lea    0x16(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0xb(%r9),%ebx
  mov    %bl,0x16(%rax)
  movzbl 0xb(%r9,%r8,1),%ebx
  mov    %bl,0x17(%rax)
  lea    0x18(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0xc(%r9),%ebx
  mov    %bl,0x18(%rax)
  movzbl 0xc(%r9,%r8,1),%ebx
  mov    %bl,0x19(%rax)
  lea    0x1a(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0xd(%r9),%ebx
  mov    %bl,0x1a(%rax)
  movzbl 0xd(%r9,%r8,1),%ebx
  mov    %bl,0x1b(%rax)
  lea    0x1c(%rax),%rbx
  cmp    %rbx,%r10
  jbe    L54
  movzbl 0xe(%r9),%r10d
  mov    %r10b,0x1c(%rax)
  movzbl 0xe(%r9,%r8,1),%r8d
  mov    %r8b,0x1d(%rax)
  nopl   (%rax)
L54:
  lea    (%rcx,%rsi,1),%r8
  add    %rdx,%r11
  mov    %r8,%r9
  cmp    %rdi,%r11
  jbe    L300
  lea    0x1(%rcx,%rsi,1),%rsi
  mov    %r11,%rdx
  mov    %rdi,%rcx
  sub    %rdi,%rdx
  sub    %rsi,%rcx
  lea    -0x1(%rdx),%rax
  cmp    $0xe,%rcx
  jbe    L365
  cmp    $0x6,%rax
  jbe    L365
  cmp    $0xe,%rax
  jbe    L77
  mov    %rdx,%rcx
  xor    %eax,%eax
  and    $0xfffffffffffffff0,%rcx
  nop
L215:
  movdqu (%r8,%rax,1),%xmm3
  movups %xmm3,(%rdi,%rax,1)
  add    $0x10,%rax
  cmp    %rcx,%rax
  jne    L215
  mov    %rdx,%rcx
  and    $0xfffffffffffffff0,%rcx
  lea    (%rdi,%rcx,1),%rax
  lea    (%r8,%rcx,1),%r9
  cmp    %rcx,%rdx
  je     L300
  sub    %rcx,%rdx
  lea    -0x1(%rdx),%rsi
  cmp    $0x6,%rsi
  jbe    L207
L166:
  mov    (%r8,%rcx,1),%rsi
  mov    %rsi,(%rdi,%rcx,1)
  mov    %rdx,%rcx
  and    $0xfffffffffffffff8,%rcx
  add    %rcx,%rax
  add    %rcx,%r9
  cmp    %rcx,%rdx
  je     L300
L207:
  movzbl (%r9),%edx
  mov    %dl,(%rax)
  lea    0x1(%rax),%rdx
  cmp    %rdx,%r11
  jbe    L300
  movzbl 0x1(%r9),%edx
  mov    %dl,0x1(%rax)
  lea    0x2(%rax),%rdx
  cmp    %rdx,%r11
  jbe    L300
  movzbl 0x2(%r9),%edx
  mov    %dl,0x2(%rax)
  lea    0x3(%rax),%rdx
  cmp    %rdx,%r11
  jbe    L300
  movzbl 0x3(%r9),%edx
  mov    %dl,0x3(%rax)
  lea    0x4(%rax),%rdx
  cmp    %rdx,%r11
  jbe    L300
  movzbl 0x4(%r9),%edx
  mov    %dl,0x4(%rax)
  lea    0x5(%rax),%rdx
  cmp    %rdx,%r11
  jbe    L300
  movzbl 0x5(%r9),%edx
  mov    %dl,0x5(%rax)
  lea    0x6(%rax),%rdx
  cmp    %rdx,%r11
  jbe    L300
  movzbl 0x6(%r9),%edx
  mov    %dl,0x6(%rax)
L300:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
  nopl   (%rax)
L378:
  mov    %rcx,%r9
  mov    %rdx,%rax
  xchg   %ax,%ax
L349:
  movzbl (%r9),%ebx
  add    $0x2,%rax
  add    $0x1,%r9
  mov    %bl,-0x2(%rax)
  movzbl -0x1(%r9,%r8,1),%ebx
  mov    %bl,-0x1(%rax)
  cmp    %rax,%r10
  ja     L349
  jmp    L54
  nopw   0x0(%rax,%rax,1)
L365:
  xor    %eax,%eax
  nopw   0x0(%rax,%rax,1)
L42:
  movzbl (%r8,%rax,1),%ecx
  mov    %cl,(%rdi,%rax,1)
  add    $0x1,%rax
  cmp    %rax,%rdx
  jne    L42
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
  nopl   0x0(%rax,%rax,1)
L3:
  mov    %rdx,%rdi
  jmp    L54
L77:
  mov    %rdi,%rax
  xor    %ecx,%ecx
  jmp    L166
```

assistant: ```c
void tpdec2(unsigned char *in, unsigned n, unsigned char *out) {
  unsigned char *op, *ip, *e;
  unsigned stride = n / 2;
  e = out + (n & ~(2 - 1));
  for (op = out, ip = in; op < e; ip++, op += 2) {
    unsigned char *p = ip;
    op[0] = *p;
    op[1] = *(p += stride);
  }
  for (ip = in + stride * 2; op < out + n;)
    *op++ = *ip++;
}
```