user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<media>:
  endbr64
  movslq %esi,%rax
  mov    %rax,%rcx
  mov    -0x4(%rdi,%rax,4),%eax
  test   %eax,%eax
  js     L100
  test   %ecx,%ecx
  jle    L161
  lea    -0x1(%rcx),%eax
  cmp    $0x3,%eax
  jbe    L212
  mov    %ecx,%edx
  pxor   %xmm1,%xmm1
  mov    %rdi,%rax
  shr    $0x2,%edx
  movdqa %xmm1,%xmm2
  movdqa %xmm1,%xmm4
  sub    $0x1,%edx
  shl    $0x4,%rdx
  lea    0x10(%rdi,%rdx,1),%rdx
  nopw   0x0(%rax,%rax,1)
L171:
  movdqu (%rax),%xmm0
  add    $0x10,%rax
  movdqa %xmm0,%xmm3
  pcmpgtd %xmm4,%xmm3
  pand   %xmm3,%xmm0
  psubd  %xmm3,%xmm1
  paddd  %xmm0,%xmm2
  cmp    %rax,%rdx
  jne    L171
  movdqa %xmm1,%xmm0
  mov    %ecx,%esi
  psrldq $0x8,%xmm0
  and    $0xfffffffc,%esi
  paddd  %xmm0,%xmm1
  movdqa %xmm1,%xmm0
  psrldq $0x4,%xmm0
  paddd  %xmm0,%xmm1
  movdqa %xmm2,%xmm0
  psrldq $0x8,%xmm0
  movd   %xmm1,%eax
  paddd  %xmm0,%xmm2
  movdqa %xmm2,%xmm0
  psrldq $0x4,%xmm0
  paddd  %xmm0,%xmm2
  movd   %xmm2,%edx
  test   $0x3,%cl
  je     L98
L46:
  movslq %esi,%r9
  lea    0x0(,%r9,4),%r8
  mov    (%rdi,%r9,4),%r9d
  test   %r9d,%r9d
  jle    L179
  add    %r9d,%edx
  add    $0x1,%eax
L179:
  lea    0x1(%rsi),%r9d
  cmp    %r9d,%ecx
  jle    L98
  mov    0x4(%rdi,%r8,1),%r9d
  test   %r9d,%r9d
  jle    L70
  add    %r9d,%edx
  add    $0x1,%eax
L70:
  lea    0x2(%rsi),%r9d
  cmp    %r9d,%ecx
  jle    L98
  mov    0x8(%rdi,%r8,1),%r9d
  test   %r9d,%r9d
  jle    L45
  add    %r9d,%edx
  add    $0x1,%eax
L45:
  add    $0x3,%esi
  cmp    %esi,%ecx
  jle    L98
  mov    0xc(%rdi,%r8,1),%ecx
  test   %ecx,%ecx
  jle    L98
L258:
  add    %ecx,%edx
  add    $0x1,%eax
L98:
  pxor   %xmm0,%xmm0
  pxor   %xmm1,%xmm1
  cvtsi2ss %edx,%xmm0
  cvtsi2ss %eax,%xmm1
  divss  %xmm1,%xmm0
  ret
  nopl   (%rax)
L100:
  test   %ecx,%ecx
  jle    L161
  lea    -0x1(%rcx),%eax
  cmp    $0x3,%eax
  jbe    L259
  mov    %ecx,%edx
  pxor   %xmm0,%xmm0
  mov    %rdi,%rax
  shr    $0x2,%edx
  movdqa %xmm0,%xmm1
  movdqa %xmm0,%xmm4
  sub    $0x1,%edx
  shl    $0x4,%rdx
  lea    0x10(%rdi,%rdx,1),%rdx
  nopl   0x0(%rax)
L214:
  movdqu (%rax),%xmm2
  add    $0x10,%rax
  movdqa %xmm2,%xmm3
  pcmpgtd %xmm4,%xmm3
  pandn  %xmm2,%xmm3
  paddd  %xmm3,%xmm1
  movdqa %xmm4,%xmm3
  pcmpgtd %xmm2,%xmm3
  psubd  %xmm3,%xmm0
  cmp    %rax,%rdx
  jne    L214
  movdqa %xmm0,%xmm2
  mov    %ecx,%esi
  psrldq $0x8,%xmm2
  and    $0xfffffffc,%esi
  paddd  %xmm2,%xmm0
  movdqa %xmm0,%xmm2
  psrldq $0x4,%xmm2
  paddd  %xmm2,%xmm0
  movd   %xmm0,%eax
  movdqa %xmm1,%xmm0
  psrldq $0x8,%xmm0
  paddd  %xmm0,%xmm1
  movdqa %xmm1,%xmm0
  psrldq $0x4,%xmm0
  paddd  %xmm0,%xmm1
  movd   %xmm1,%edx
  test   $0x3,%cl
  je     L98
L87:
  movslq %esi,%r9
  lea    0x0(,%r9,4),%r8
  mov    (%rdi,%r9,4),%r9d
  test   %r9d,%r9d
  js     L1
L104:
  lea    0x1(%rsi),%r9d
  cmp    %r9d,%ecx
  jle    L98
  mov    0x4(%rdi,%r8,1),%r9d
  test   %r9d,%r9d
  js     L163
L238:
  lea    0x2(%rsi),%r9d
  cmp    %r9d,%ecx
  jle    L98
  mov    0x8(%rdi,%r8,1),%r9d
  test   %r9d,%r9d
  js     L209
L184:
  add    $0x3,%esi
  cmp    %esi,%ecx
  jle    L98
  mov    0xc(%rdi,%r8,1),%ecx
  test   %ecx,%ecx
  jns    L98
  jmp    L258
  nopw   0x0(%rax,%rax,1)
L1:
  add    %r9d,%edx
  add    $0x1,%eax
  jmp    L104
  nopl   0x0(%rax,%rax,1)
L163:
  add    %r9d,%edx
  add    $0x1,%eax
  jmp    L238
  nopl   0x0(%rax,%rax,1)
L209:
  add    %r9d,%edx
  add    $0x1,%eax
  jmp    L184
L212:
  xor    %esi,%esi
  xor    %eax,%eax
  xor    %edx,%edx
  jmp    L46
  nopl   0x0(%rax,%rax,1)
L161:
  pxor   %xmm1,%xmm1
  movaps %xmm1,%xmm0
  divss  %xmm1,%xmm0
  ret
L259:
  xor    %esi,%esi
  xor    %eax,%eax
  xor    %edx,%edx
  jmp    L87
```

assistant: ```c
float media(int a[], int dim) {
  int sum = 0;
  int n = 0;
  if (a[dim - 1] < 0) {
    for (int i = 0; i < dim; i++) {
      if (a[i] < 0) {
        sum += a[i];
        n++;
      }
    }
  } else {
    for (int i = 0; i < dim; i++) {
      if (a[i] > 0) {
        sum += a[i];
        n++;
      }
    }
  }
  return (float)sum / n;
}
```