user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<block_variance>:
  endbr64
  mov    %edx,%eax
  push   %r15
  imul   %esi,%eax
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %eax,-0x14(%rsp)
  test   %edx,%edx
  jle    L132
  mov    %esi,%eax
  movslq %ecx,%rbx
  mov    %edx,%r13d
  mov    %esi,%r11d
  shr    $0x2,%eax
  lea    0x0(,%rbx,4),%rbp
  mov    %rdi,%r8
  xor    %ecx,%ecx
  sub    $0x1,%eax
  lea    -0x1(%rsi),%r12d
  and    $0xfffffffc,%r11d
  mov    %rdi,%r9
  shl    $0x4,%rax
  xor    %r10d,%r10d
  mov    %rax,%rdx
  mov    %rax,-0x10(%rsp)
  xor    %eax,%eax
  lea    0x10(%rdx),%r14
  nopl   (%rax)
L164:
  test   %esi,%esi
  jle    L40
  cmp    $0x2,%r12d
  jbe    L169
  lea    (%r14,%r9,1),%r15
  mov    %r9,%rdx
  pxor   %xmm0,%xmm0
  nopl   (%rax)
L122:
  movdqu (%rdx),%xmm4
  add    $0x10,%rdx
  paddd  %xmm4,%xmm0
  cmp    %r15,%rdx
  jne    L122
  movdqa %xmm0,%xmm1
  psrldq $0x8,%xmm1
  paddd  %xmm1,%xmm0
  movdqa %xmm0,%xmm1
  psrldq $0x4,%xmm1
  paddd  %xmm1,%xmm0
  movd   %xmm0,%edx
  add    %edx,%eax
  mov    %r11d,%edx
  cmp    %esi,%r11d
  je     L40
L123:
  movslq %edx,%r15
  add    %rcx,%r15
  add    (%rdi,%r15,4),%eax
  lea    0x1(%rdx),%r15d
  cmp    %r15d,%esi
  jle    L40
  movslq %r15d,%r15
  add    $0x2,%edx
  add    %rcx,%r15
  add    (%rdi,%r15,4),%eax
  cmp    %edx,%esi
  jle    L40
  movslq %edx,%rdx
  add    %rcx,%rdx
  add    (%rdi,%rdx,4),%eax
L40:
  lea    0x1(%r10),%edx
  add    %rbx,%rcx
  add    %rbp,%r9
  cmp    %edx,%r13d
  je     L31
  mov    %edx,%r10d
  jmp    L164
  nopl   (%rax)
L31:
  xor    %edx,%edx
  mov    -0x10(%rsp),%r14
  xor    %r9d,%r9d
  xor    %ecx,%ecx
  divl   -0x14(%rsp)
  xor    %r13d,%r13d
  add    $0x10,%r14
  movd   %eax,%xmm5
  pshufd $0x0,%xmm5,%xmm3
L154:
  test   %esi,%esi
  jle    L118
  cmp    $0x2,%r12d
  jbe    L25
  lea    (%r14,%r8,1),%r15
  mov    %r8,%rdx
  pxor   %xmm2,%xmm2
  nopl   (%rax)
L166:
  movdqu (%rdx),%xmm0
  add    $0x10,%rdx
  psubd  %xmm3,%xmm0
  movdqa %xmm0,%xmm1
  pmuludq %xmm0,%xmm1
  psrlq  $0x20,%xmm0
  pmuludq %xmm0,%xmm0
  pshufd $0x8,%xmm1,%xmm1
  pshufd $0x8,%xmm0,%xmm0
  punpckldq %xmm0,%xmm1
  paddd  %xmm1,%xmm2
  cmp    %rdx,%r15
  jne    L166
  movdqa %xmm2,%xmm0
  psrldq $0x8,%xmm0
  paddd  %xmm0,%xmm2
  movdqa %xmm2,%xmm0
  psrldq $0x4,%xmm0
  paddd  %xmm0,%xmm2
  movd   %xmm2,%edx
  add    %edx,%ecx
  mov    %r11d,%edx
  cmp    %esi,%r11d
  je     L118
L43:
  movslq %edx,%r15
  add    %r9,%r15
  mov    (%rdi,%r15,4),%r15d
  sub    %eax,%r15d
  imul   %r15d,%r15d
  add    %r15d,%ecx
  lea    0x1(%rdx),%r15d
  cmp    %esi,%r15d
  jge    L118
  movslq %r15d,%r15
  add    $0x2,%edx
  add    %r9,%r15
  mov    (%rdi,%r15,4),%r15d
  sub    %eax,%r15d
  imul   %r15d,%r15d
  add    %r15d,%ecx
  cmp    %edx,%esi
  jle    L118
  movslq %edx,%rdx
  add    %r9,%rdx
  mov    (%rdi,%rdx,4),%edx
  sub    %eax,%edx
  imul   %edx,%edx
  add    %edx,%ecx
L118:
  lea    0x1(%r13),%edx
  add    %rbx,%r9
  add    %rbp,%r8
  cmp    %r13d,%r10d
  je     L177
  mov    %edx,%r13d
  jmp    L154
  nopl   0x0(%rax,%rax,1)
L177:
  mov    %ecx,%eax
  xor    %edx,%edx
  divl   -0x14(%rsp)
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L25:
  xor    %edx,%edx
  jmp    L43
L169:
  xor    %edx,%edx
  jmp    L123
L132:
  pop    %rbx
  xor    %eax,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
unsigned int block_variance(int *in, int w, int h, int pitch) {
  int i, j;
  unsigned int avg, var;
  int dif;
  int *ino;
  avg = 0;
  for (j = 0; j < h; j++) {
    ino = in + j * pitch;
    for (i = 0; i < w; i++) {
      avg += ino[i];
    }
  }
  avg /= (h * w);
  var = 0;
  for (j = 0; j < h; j++) {
    ino = in + j * pitch;
    for (i = 0; i < w; i++) {
      dif = ino[i] - avg;
      var = var + (dif * dif);
    }
  }
  return var / (h * w);
}
```