user: 这段汇编代码用C语言表示是什么样的:

```asm
<m_prod>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x38(%rbp)
  mov    %rsi,-0x40(%rbp)
  mov    %rdx,-0x48(%rbp)
  mov    %rcx,-0x50(%rbp)
  mov    -0x38(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x24(%rbp)
  mov    -0x24(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x20(%rbp)
  mov    -0x20(%rbp),%eax
  cltq
  shl    $0x3,%rax
  neg    %rax
  add    %rax,-0x50(%rbp)
  mov    -0x38(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x1c(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x18(%rbp),%eax
  cltq
  shl    $0x3,%rax
  neg    %rax
  add    %rax,-0x48(%rbp)
  mov    -0x38(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x14(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x10(%rbp)
  mov    -0x10(%rbp),%eax
  cltq
  shl    $0x3,%rax
  neg    %rax
  add    %rax,-0x40(%rbp)
  mov    -0x38(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0xc(%rbp)
  movl   $0x1,D147(%rip)
  jmp    L43
L0:
  mov    -0x38(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x8(%rbp)
  movl   $0x1,D81(%rip)
  jmp    L12
L5:
  mov    D81(%rip),%eax
  imul   -0x24(%rbp),%eax
  mov    %eax,%edx
  mov    D147(%rip),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  pxor   %xmm0,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x4(%rbp)
  movl   $0x1,D45(%rip)
  jmp    L45
L8:
  mov    D81(%rip),%eax
  imul   -0x24(%rbp),%eax
  mov    %eax,%edx
  mov    D147(%rip),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    D45(%rip),%eax
  imul   -0x14(%rbp),%eax
  mov    %eax,%edx
  mov    D147(%rip),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x40(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm2
  mov    D81(%rip),%eax
  imul   -0x1c(%rbp),%eax
  mov    %eax,%edx
  mov    D45(%rip),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm2,%xmm0
  mov    D81(%rip),%eax
  imul   -0x24(%rbp),%eax
  mov    %eax,%edx
  mov    D147(%rip),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    D45(%rip),%eax
  add    $0x1,%eax
  mov    %eax,D204(%rip)
L45:
  mov    D204(%rip),%eax
  cmp    %eax,-0x4(%rbp)
  jge    L8
  mov    D81(%rip),%eax
  add    $0x1,%eax
  mov    %eax,D204(%rip)
L12:
  mov    D204(%rip),%eax
  cmp    %eax,-0x8(%rbp)
  jge    L5
  mov    D147(%rip),%eax
  add    $0x1,%eax
  mov    %eax,D204(%rip)
L43:
  mov    D204(%rip),%eax
  cmp    %eax,-0xc(%rbp)
  jge    L0
  mov    $0x0,%eax
  pop    %rbp
  ret
```

assistant: ```c
int m_prod(n, a, b, c)
int *n;
double *a, *b, *c;
{
  int a_dim1, a_offset, b_dim1, b_offset, c_dim1, c_offset, i__1, i__2, i__3;
  static int i, j, k;
  c_dim1 = *n;
  c_offset = c_dim1 + 1;
  c -= c_offset;
  b_dim1 = *n;
  b_offset = b_dim1 + 1;
  b -= b_offset;
  a_dim1 = *n;
  a_offset = a_dim1 + 1;
  a -= a_offset;
  i__1 = *n;
  for (i = 1; i <= i__1; ++i) {
    i__2 = *n;
    for (j = 1; j <= i__2; ++j) {
      c[i + j * c_dim1] = (double)0.;
      i__3 = *n;
      for (k = 1; k <= i__3; ++k) {
        c[i + j * c_dim1] += a[i + k * a_dim1] * b[k + j * b_dim1];
      }
    }
  }
  return 0;
}
```