user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<l2norm>:
  endbr64
  push   %r15
  pxor   %xmm0,%xmm0
  mov    %edi,%r10d
  mov    %esi,%r11d
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  mov    %edx,%ebp
  mov    %ecx,%edx
  push   %rbx
  sub    $0x28,%rsp
  mov    0x70(%rsp),%rbx
  mov    0x60(%rsp),%r13d
  mov    0x68(%rsp),%rcx
  movq   $0x0,0x20(%rbx)
  movups %xmm0,(%rbx)
  movups %xmm0,0x10(%rbx)
  cmp    %r8d,%edx
  jg     L27
  mov    %r8d,%eax
  movslq %edx,%rsi
  lea    -0x1(%rbp),%r8d
  mov    %r9d,%r12d
  movapd %xmm0,%xmm2
  movapd %xmm0,%xmm3
  pxor   %xmm1,%xmm1
  sub    %edx,%eax
  add    %rsi,%rax
  movslq %r12d,%rdx
  lea    0x1(%r13),%edi
  imul   $0x29428,%rax,%rax
  imul   $0x29428,%rsi,%r9
  mov    $0xffffffffffffffd8,%rsi
  imul   $0xa28,%rdx,%rdx
  lea    0x29428(%rcx,%rax,1),%r14
  lea    -0x3(%rbp),%eax
  lea    (%rax,%rax,4),%rax
  add    %rcx,%r9
  shl    $0x3,%rax
  lea    0x50(%rax,%rdx,1),%r15
  sub    %rax,%rsi
  cs nopw 0x0(%rax,%rax,1)
L129:
  cmp    %r13d,%r12d
  jg     L152
  lea    (%r15,%r9,1),%rdx
  mov    %r12d,%ecx
  nopl   0x0(%rax)
L29:
  lea    (%rsi,%rdx,1),%rax
  cmp    $0x1,%r8d
  jle    L11
  nopw   0x0(%rax,%rax,1)
L82:
  movsd  (%rax),%xmm0
  add    $0x28,%rax
  mulsd  %xmm0,%xmm0
  addsd  %xmm0,%xmm1
  movupd -0x20(%rax),%xmm0
  mulpd  %xmm0,%xmm0
  addpd  %xmm0,%xmm3
  movupd -0x10(%rax),%xmm0
  mulpd  %xmm0,%xmm0
  addpd  %xmm0,%xmm2
  cmp    %rdx,%rax
  jne    L82
L11:
  add    $0x1,%ecx
  add    $0xa28,%rdx
  cmp    %edi,%ecx
  jne    L29
L152:
  add    $0x29428,%r9
  cmp    %r14,%r9
  jne    L129
  pxor   %xmm0,%xmm0
  addpd  %xmm0,%xmm3
  addpd  %xmm0,%xmm2
  pxor   %xmm0,%xmm0
  addsd  %xmm1,%xmm0
L9:
  sub    $0x2,%r11d
  lea    -0x2(%r10),%eax
  sub    $0x2,%ebp
  movups %xmm3,0x8(%rbx)
  imul   %r11d,%eax
  pxor   %xmm6,%xmm6
  pxor   %xmm7,%xmm7
  movups %xmm2,0x18(%rbx)
  movhpd %xmm2,0x18(%rsp)
  movq   %xmm2,%r15
  movq   %xmm3,%r12
  movhpd %xmm3,0x10(%rsp)
  imul   %ebp,%eax
  cvtsi2sd %eax,%xmm6
  divsd  %xmm6,%xmm0
  movsd  %xmm6,0x8(%rsp)
  ucomisd %xmm0,%xmm7
  ja     L92
  sqrtsd %xmm0,%xmm0
L87:
  movsd  %xmm0,(%rbx)
  movq   %r12,%xmm0
  divsd  0x8(%rsp),%xmm0
  ucomisd %xmm0,%xmm7
  ja     L14
  sqrtsd %xmm0,%xmm0
L165:
  movsd  %xmm0,0x8(%rbx)
  movsd  0x10(%rsp),%xmm0
  divsd  0x8(%rsp),%xmm0
  ucomisd %xmm0,%xmm7
  ja     L60
  sqrtsd %xmm0,%xmm0
L107:
  movsd  %xmm0,0x10(%rbx)
  movq   %r15,%xmm0
  divsd  0x8(%rsp),%xmm0
  ucomisd %xmm0,%xmm7
  ja     L13
  sqrtsd %xmm0,%xmm0
L2:
  movsd  %xmm0,0x18(%rbx)
  movsd  0x18(%rsp),%xmm0
  divsd  0x8(%rsp),%xmm0
  ucomisd %xmm0,%xmm7
  ja     L163
  sqrtsd %xmm0,%xmm0
L88:
  movsd  %xmm0,0x20(%rbx)
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L27:
  pxor   %xmm2,%xmm2
  pxor   %xmm0,%xmm0
  movapd %xmm2,%xmm3
  jmp    L9
L92:
  call   <sqrt@plt>
  pxor   %xmm7,%xmm7
  jmp    L87
L163:
  call   <sqrt@plt>
  jmp    L88
L13:
  call   <sqrt@plt>
  pxor   %xmm7,%xmm7
  jmp    L2
L60:
  call   <sqrt@plt>
  pxor   %xmm7,%xmm7
  jmp    L107
L14:
  call   <sqrt@plt>
  pxor   %xmm7,%xmm7
  jmp    L165
```

assistant: ```c
void l2norm(int nx0, int ny0, int nz0, int ist, int iend, int jst, int jend, double v[64][64 / 2 * 2 + 1][64 / 2 * 2 + 1][5], double sum[5]) {
  int i, j, k, m;
  double sum0 = 0.0, sum1 = 0.0, sum2 = 0.0, sum3 = 0.0, sum4 = 0.0;
#pragma omp single
  for (m = 0; m < 5; m++) {
    sum[m] = 0.0;
  }
#pragma omp for nowait
  for (i = ist; i <= iend; i++) {
    for (j = jst; j <= jend; j++) {
      for (k = 1; k <= nz0 - 2; k++) {
        sum0 = sum0 + v[i][j][k][0] * v[i][j][k][0];
        sum1 = sum1 + v[i][j][k][1] * v[i][j][k][1];
        sum2 = sum2 + v[i][j][k][2] * v[i][j][k][2];
        sum3 = sum3 + v[i][j][k][3] * v[i][j][k][3];
        sum4 = sum4 + v[i][j][k][4] * v[i][j][k][4];
      }
    }
  }
#pragma omp critical
  {
    sum[0] += sum0;
    sum[1] += sum1;
    sum[2] += sum2;
    sum[3] += sum3;
    sum[4] += sum4;
  }
#pragma omp barrier
#pragma omp single
  for (m = 0; m < 5; m++) {
    sum[m] = sqrt(sum[m] / ((nx0 - 2) * (ny0 - 2) * (nz0 - 2)));
  }
}
```