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

```asm
<dist2>:
  endbr64
  mov    %ecx,%r10d
  mov    %rdi,%rax
  or     %r8d,%r10d
  jne    L25
  test   %r9d,%r9d
  jle    L33
  pxor   %xmm4,%xmm4
  movslq %edx,%rdi
  xor    %ecx,%ecx
  xor    %edx,%edx
  movdqa %xmm4,%xmm5
  pxor   %xmm3,%xmm3
  nop
L46:
  movdqu (%rax,%rdx,1),%xmm0
  movdqu (%rsi,%rdx,1),%xmm2
  add    $0x1,%ecx
  add    %rdi,%rdx
  movdqa %xmm0,%xmm1
  movdqa %xmm2,%xmm6
  punpckhbw %xmm3,%xmm0
  punpcklbw %xmm3,%xmm1
  punpcklbw %xmm3,%xmm6
  punpckhbw %xmm3,%xmm2
  psubw  %xmm6,%xmm1
  psubw  %xmm2,%xmm0
  pmaddwd %xmm1,%xmm1
  pmaddwd %xmm0,%xmm0
  paddd  %xmm1,%xmm5
  paddd  %xmm0,%xmm4
  cmp    %r9d,%ecx
  jne    L46
  paddd  %xmm5,%xmm4
  movdqa %xmm4,%xmm0
  psrldq $0x8,%xmm0
  paddd  %xmm0,%xmm4
  movdqa %xmm4,%xmm0
  psrldq $0x4,%xmm0
  paddd  %xmm0,%xmm4
  movd   %xmm4,%r10d
L33:
  mov    %r10d,%eax
  ret
L25:
  push   %r12
  push   %rbp
  push   %rbx
  test   %ecx,%ecx
  je     L86
  test   %r8d,%r8d
  jne    L86
  test   %r9d,%r9d
  jle    L44
  movslq %edx,%rdi
  xor    %r10d,%r10d
L116:
  movzbl 0x1(%rax),%ebx
  movzbl (%rax),%edx
  movzbl (%rsi),%ecx
  movzbl 0x2(%rax),%r11d
  lea    0x1(%rbx,%rdx,1),%edx
  shr    %edx
  sub    %ecx,%edx
  imul   %edx,%edx
  lea    (%rdx,%r10,1),%ecx
  movzbl 0x1(%rsi),%r10d
  lea    0x1(%rbx,%r11,1),%edx
  shr    %edx
  sub    %r10d,%edx
  movzbl 0x3(%rax),%r10d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r11,%r10,1),%edx
  movzbl 0x2(%rsi),%r11d
  shr    %edx
  sub    %r11d,%edx
  movzbl 0x4(%rax),%r11d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r10,%r11,1),%edx
  movzbl 0x3(%rsi),%r10d
  shr    %edx
  sub    %r10d,%edx
  movzbl 0x5(%rax),%r10d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r11,%r10,1),%edx
  movzbl 0x4(%rsi),%r11d
  shr    %edx
  sub    %r11d,%edx
  movzbl 0x6(%rax),%r11d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r10,%r11,1),%edx
  movzbl 0x5(%rsi),%r10d
  shr    %edx
  sub    %r10d,%edx
  movzbl 0x7(%rax),%r10d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r11,%r10,1),%edx
  movzbl 0x6(%rsi),%r11d
  shr    %edx
  sub    %r11d,%edx
  movzbl 0x8(%rax),%r11d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r10,%r11,1),%edx
  movzbl 0x7(%rsi),%r10d
  shr    %edx
  sub    %r10d,%edx
  movzbl 0x9(%rax),%r10d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r11,%r10,1),%edx
  movzbl 0x8(%rsi),%r11d
  shr    %edx
  sub    %r11d,%edx
  movzbl 0xa(%rax),%r11d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r10,%r11,1),%edx
  movzbl 0x9(%rsi),%r10d
  shr    %edx
  sub    %r10d,%edx
  movzbl 0xb(%rax),%r10d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r11,%r10,1),%edx
  movzbl 0xa(%rsi),%r11d
  shr    %edx
  sub    %r11d,%edx
  movzbl 0xc(%rax),%r11d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r10,%r11,1),%edx
  movzbl 0xb(%rsi),%r10d
  shr    %edx
  sub    %r10d,%edx
  movzbl 0xd(%rax),%r10d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r11,%r10,1),%edx
  movzbl 0xc(%rsi),%r11d
  shr    %edx
  sub    %r11d,%edx
  movzbl 0xe(%rax),%r11d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r10,%r11,1),%edx
  movzbl 0xd(%rsi),%r10d
  shr    %edx
  sub    %r10d,%edx
  movzbl 0xf(%rax),%r10d
  imul   %edx,%edx
  add    %edx,%ecx
  lea    0x1(%r11,%r10,1),%edx
  movzbl 0xe(%rsi),%r11d
  shr    %edx
  sub    %r11d,%edx
  imul   %edx,%edx
  add    %ecx,%edx
  movzbl 0x10(%rax),%ecx
  add    %rdi,%rax
  lea    0x1(%r10,%rcx,1),%r10d
  movzbl 0xf(%rsi),%ecx
  shr    %r10d
  sub    %ecx,%r10d
  imul   %r10d,%r10d
  add    %edx,%r10d
  add    %rdi,%rsi
  add    $0x1,%r8d
  cmp    %r8d,%r9d
  jne    L116
L0:
  pop    %rbx
  mov    %r10d,%eax
  pop    %rbp
  pop    %r12
  ret
L86:
  movslq %edx,%rdx
  lea    (%rax,%rdx,1),%r11
  test   %ecx,%ecx
  jne    L34
  test   %r8d,%r8d
  je     L34
  test   %r9d,%r9d
  jle    L44
  pxor   %xmm6,%xmm6
  xor    %ecx,%ecx
  pxor   %xmm5,%xmm5
  xor    %edi,%edi
  movdqa %xmm6,%xmm7
  movdqa %xmm6,%xmm2
  movdqa %xmm6,%xmm8
  pxor   %xmm4,%xmm4
  nopw   0x0(%rax,%rax,1)
L69:
  movdqu (%r11,%rcx,1),%xmm1
  movdqu (%rax,%rcx,1),%xmm3
  add    $0x1,%edi
  movdqu (%rsi,%rcx,1),%xmm10
  add    %rdx,%rcx
  pavgb  %xmm1,%xmm3
  movdqa %xmm3,%xmm0
  movdqa %xmm10,%xmm9
  punpckhbw %xmm5,%xmm3
  punpcklbw %xmm5,%xmm0
  punpcklbw %xmm5,%xmm9
  punpckhbw %xmm5,%xmm10
  movdqa %xmm0,%xmm1
  movdqa %xmm9,%xmm11
  punpckhwd %xmm4,%xmm0
  punpcklwd %xmm4,%xmm11
  punpckhwd %xmm4,%xmm9
  punpcklwd %xmm4,%xmm1
  psubd  %xmm11,%xmm1
  psubd  %xmm9,%xmm0
  movdqa %xmm10,%xmm11
  movdqa %xmm3,%xmm9
  punpckhwd %xmm4,%xmm10
  punpckhwd %xmm4,%xmm3
  psubd  %xmm10,%xmm3
  movdqa %xmm1,%xmm10
  punpcklwd %xmm4,%xmm9
  pmuludq %xmm1,%xmm10
  psrlq  $0x20,%xmm1
  punpcklwd %xmm4,%xmm11
  pmuludq %xmm1,%xmm1
  psubd  %xmm11,%xmm9
  pshufd $0x8,%xmm10,%xmm10
  pshufd $0x8,%xmm1,%xmm1
  punpckldq %xmm1,%xmm10
  paddd  %xmm10,%xmm8
  movdqa %xmm0,%xmm10
  pmuludq %xmm0,%xmm10
  psrlq  $0x20,%xmm0
  pmuludq %xmm0,%xmm0
  pshufd $0x8,%xmm10,%xmm10
  pshufd $0x8,%xmm0,%xmm1
  movdqa %xmm10,%xmm0
  punpckldq %xmm1,%xmm0
  movdqa %xmm9,%xmm1
  paddd  %xmm0,%xmm2
  pmuludq %xmm9,%xmm1
  movdqa %xmm9,%xmm0
  psrlq  $0x20,%xmm0
  pmuludq %xmm0,%xmm0
  pshufd $0x8,%xmm1,%xmm1
  pshufd $0x8,%xmm0,%xmm0
  punpckldq %xmm0,%xmm1
  movdqa %xmm3,%xmm0
  pmuludq %xmm3,%xmm0
  psrlq  $0x20,%xmm3
  paddd  %xmm1,%xmm7
  pmuludq %xmm3,%xmm3
  pshufd $0x8,%xmm0,%xmm0
  pshufd $0x8,%xmm3,%xmm3
  punpckldq %xmm3,%xmm0
  paddd  %xmm0,%xmm6
  cmp    %r9d,%edi
  jne    L69
  paddd  %xmm8,%xmm2
  pop    %rbx
  pop    %rbp
  movdqa %xmm2,%xmm0
  pop    %r12
  paddd  %xmm7,%xmm0
  paddd  %xmm6,%xmm0
  movdqa %xmm0,%xmm1
  psrldq $0x8,%xmm1
  paddd  %xmm1,%xmm0
  movdqa %xmm0,%xmm1
  psrldq $0x4,%xmm1
  paddd  %xmm1,%xmm0
  movd   %xmm0,%r10d
  mov    %r10d,%eax
  ret
L34:
  xor    %r10d,%r10d
  test   %r9d,%r9d
  jle    L0
  xor    %edi,%edi
  nopl   0x0(%rax)
L37:
  movzbl 0x1(%rax),%r8d
  movzbl (%rax),%ecx
  movzbl (%r11),%ebp
  movzbl 0x1(%r11),%ebx
  add    %r8d,%ecx
  movzbl 0x2(%r11),%r12d
  add    %ebp,%ecx
  movzbl (%rsi),%ebp
  lea    0x2(%rbx,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %ebp,%ecx
  imul   %ecx,%ecx
  lea    (%rcx,%r10,1),%ebp
  movzbl 0x2(%rax),%r10d
  lea    (%r8,%r10,1),%ecx
  movzbl 0x1(%rsi),%r8d
  add    %ebx,%ecx
  movzbl 0x3(%rax),%ebx
  lea    0x2(%r12,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %r8d,%ecx
  imul   %ecx,%ecx
  lea    (%rcx,%rbp,1),%r8d
  movzbl 0x3(%r11),%ebp
  lea    (%r10,%rbx,1),%ecx
  movzbl 0x2(%rsi),%r10d
  add    %r12d,%ecx
  movzbl 0x4(%r11),%r12d
  lea    0x2(%rbp,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %r10d,%ecx
  movzbl 0x4(%rax),%r10d
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%rbx,%r10,1),%ecx
  movzbl 0x3(%rsi),%ebx
  add    %ebp,%ecx
  movzbl 0x5(%r11),%ebp
  lea    0x2(%r12,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %ebx,%ecx
  movzbl 0x5(%rax),%ebx
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%r10,%rbx,1),%ecx
  movzbl 0x4(%rsi),%r10d
  add    %r12d,%ecx
  movzbl 0x6(%r11),%r12d
  lea    0x2(%rbp,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %r10d,%ecx
  movzbl 0x6(%rax),%r10d
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%rbx,%r10,1),%ecx
  movzbl 0x5(%rsi),%ebx
  add    %ebp,%ecx
  movzbl 0x7(%r11),%ebp
  lea    0x2(%r12,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %ebx,%ecx
  movzbl 0x7(%rax),%ebx
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%r10,%rbx,1),%ecx
  movzbl 0x6(%rsi),%r10d
  add    %r12d,%ecx
  movzbl 0x8(%r11),%r12d
  lea    0x2(%rbp,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %r10d,%ecx
  movzbl 0x8(%rax),%r10d
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%rbx,%r10,1),%ecx
  movzbl 0x7(%rsi),%ebx
  add    %ebp,%ecx
  movzbl 0x9(%r11),%ebp
  lea    0x2(%r12,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %ebx,%ecx
  movzbl 0x9(%rax),%ebx
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%r10,%rbx,1),%ecx
  movzbl 0x8(%rsi),%r10d
  add    %r12d,%ecx
  movzbl 0xa(%r11),%r12d
  lea    0x2(%rbp,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %r10d,%ecx
  movzbl 0xa(%rax),%r10d
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%rbx,%r10,1),%ecx
  movzbl 0x9(%rsi),%ebx
  add    %ebp,%ecx
  lea    0x2(%r12,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %ebx,%ecx
  movzbl 0xb(%rax),%ebx
  movzbl 0xb(%r11),%ebp
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%r10,%rbx,1),%ecx
  movzbl 0xa(%rsi),%r10d
  add    %r12d,%ecx
  movzbl 0xc(%r11),%r12d
  lea    0x2(%rbp,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %r10d,%ecx
  movzbl 0xc(%rax),%r10d
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%rbx,%r10,1),%ecx
  movzbl 0xb(%rsi),%ebx
  add    %ebp,%ecx
  movzbl 0xd(%r11),%ebp
  lea    0x2(%r12,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %ebx,%ecx
  movzbl 0xd(%rax),%ebx
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%r10,%rbx,1),%ecx
  movzbl 0xc(%rsi),%r10d
  add    %r12d,%ecx
  movzbl 0xe(%r11),%r12d
  lea    0x2(%rbp,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %r10d,%ecx
  movzbl 0xe(%rax),%r10d
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%rbx,%r10,1),%ecx
  movzbl 0xd(%rsi),%ebx
  add    %ebp,%ecx
  movzbl 0xf(%rax),%ebp
  add    $0x1,%edi
  lea    0x2(%r12,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %ebx,%ecx
  movzbl 0xf(%r11),%ebx
  imul   %ecx,%ecx
  add    %ecx,%r8d
  lea    (%r10,%rbp,1),%ecx
  movzbl 0xe(%rsi),%r10d
  add    %r12d,%ecx
  lea    0x2(%rbx,%rcx,1),%ecx
  shr    $0x2,%ecx
  sub    %r10d,%ecx
  movzbl 0x10(%r11),%r10d
  add    %rdx,%r11
  imul   %ecx,%ecx
  add    %r8d,%ecx
  movzbl 0x10(%rax),%r8d
  add    %rdx,%rax
  add    %ebp,%r8d
  add    %ebx,%r8d
  lea    0x2(%r8,%r10,1),%r10d
  movzbl 0xf(%rsi),%r8d
  add    %rdx,%rsi
  shr    $0x2,%r10d
  sub    %r8d,%r10d
  imul   %r10d,%r10d
  add    %ecx,%r10d
  cmp    %edi,%r9d
  jne    L37
  pop    %rbx
  mov    %r10d,%eax
  pop    %rbp
  pop    %r12
  ret
L44:
  xor    %r10d,%r10d
  jmp    L0
```

assistant: ```c
int dist2(blk1, blk2, lx, hx, hy, h)
unsigned char *blk1, *blk2;
int lx, hx, hy, h;
{
  unsigned char *p1, *p1a, *p2;
  int i, j;
  int s, v;
  s = 0;
  p1 = blk1;
  p2 = blk2;
  if (!hx && !hy)
    for (j = 0; j < h; j++) {
      for (i = 0; i < 16; i++) {
        v = p1[i] - p2[i];
        s += v * v;
      }
      p1 += lx;
      p2 += lx;
    }
  else if (hx && !hy)
    for (j = 0; j < h; j++) {
      for (i = 0; i < 16; i++) {
        v = ((unsigned int)(p1[i] + p1[i + 1] + 1) >> 1) - p2[i];
        s += v * v;
      }
      p1 += lx;
      p2 += lx;
    }
  else if (!hx && hy) {
    p1a = p1 + lx;
    for (j = 0; j < h; j++) {
      for (i = 0; i < 16; i++) {
        v = ((unsigned int)(p1[i] + p1a[i] + 1) >> 1) - p2[i];
        s += v * v;
      }
      p1 = p1a;
      p1a += lx;
      p2 += lx;
    }
  } else {
    p1a = p1 + lx;
    for (j = 0; j < h; j++) {
      for (i = 0; i < 16; i++) {
        v = ((unsigned int)(p1[i] + p1[i + 1] + p1a[i] + p1a[i + 1] + 2) >> 2) - p2[i];
        s += v * v;
      }
      p1 = p1a;
      p1a += lx;
      p2 += lx;
    }
  }
  return s;
}
```