user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<matprod_trans2_sub_xrows>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x40,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    %ecx,-0x2c(%rbp)
  mov    %r8d,-0x30(%rbp)
  mov    %r9d,-0x34(%rbp)
  mov    $0x1,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <assert@plt>
  mov    $0x1,%edi
  call   <assert@plt>
  cmpl   $0x3c0,0x10(%rbp)
  setle  %al
  movzbl %al,%eax
  mov    %eax,%edi
  call   <assert@plt>
  cmpl   $0x20,-0x30(%rbp)
  jle    L10
  mov    $0x7800,%eax
  cltd
  idivl  0x10(%rbp)
  and    $0xfffffff8,%eax
  mov    %eax,-0x8(%rbp)
  mov    -0x8(%rbp),%eax
  cmp    -0x30(%rbp),%eax
  jl     L15
L10:
  mov    -0x34(%rbp),%r9d
  mov    -0x30(%rbp),%r8d
  mov    -0x2c(%rbp),%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x20(%rbp),%rsi
  mov    -0x18(%rbp),%rax
  push   0x20(%rbp)
  push   $0x1
  push   $0x0
  mov    -0x30(%rbp),%edi
  push   %rdi
  mov    0x18(%rbp),%edi
  push   %rdi
  mov    0x10(%rbp),%edi
  push   %rdi
  mov    %rax,%rdi
  call   <matprod_trans2_sub_xrowscols@plt>
  add    $0x30,%rsp
  jmp    L39
L15:
  mov    -0x30(%rbp),%eax
  mov    %eax,-0x10(%rbp)
  movl   $0x0,-0xc(%rbp)
  jmp    L49
L48:
  mov    -0x34(%rbp),%r9d
  mov    -0x30(%rbp),%r8d
  mov    -0x2c(%rbp),%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x20(%rbp),%rsi
  mov    -0x18(%rbp),%rax
  push   0x20(%rbp)
  push   $0x0
  mov    -0xc(%rbp),%edi
  push   %rdi
  mov    -0x8(%rbp),%edi
  push   %rdi
  mov    0x18(%rbp),%edi
  push   %rdi
  mov    0x10(%rbp),%edi
  push   %rdi
  mov    %rax,%rdi
  call   <matprod_trans2_sub_xrowscols@plt>
  add    $0x30,%rsp
  mov    -0x8(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x2c(%rbp),%eax
  cltq
  imul   %rdx,%rax
  shl    $0x3,%rax
  add    %rax,-0x18(%rbp)
  mov    -0x8(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x34(%rbp),%eax
  cltq
  imul   %rdx,%rax
  shl    $0x3,%rax
  add    %rax,-0x20(%rbp)
  mov    -0x8(%rbp),%eax
  sub    %eax,-0x10(%rbp)
  movl   $0x1,-0xc(%rbp)
L49:
  mov    -0x8(%rbp),%eax
  add    %eax,%eax
  cmp    %eax,-0x10(%rbp)
  jg     L48
  mov    -0x10(%rbp),%eax
  cmp    -0x8(%rbp),%eax
  jle    L3
  mov    -0x10(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  and    $0xfffffffc,%eax
  mov    %eax,-0x4(%rbp)
  mov    -0x34(%rbp),%r9d
  mov    -0x30(%rbp),%r8d
  mov    -0x2c(%rbp),%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x20(%rbp),%rsi
  mov    -0x18(%rbp),%rax
  push   0x20(%rbp)
  push   $0x0
  mov    -0xc(%rbp),%edi
  push   %rdi
  mov    -0x4(%rbp),%edi
  push   %rdi
  mov    0x18(%rbp),%edi
  push   %rdi
  mov    0x10(%rbp),%edi
  push   %rdi
  mov    %rax,%rdi
  call   <matprod_trans2_sub_xrowscols@plt>
  add    $0x30,%rsp
  mov    -0x4(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x2c(%rbp),%eax
  cltq
  imul   %rdx,%rax
  shl    $0x3,%rax
  add    %rax,-0x18(%rbp)
  mov    -0x4(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x34(%rbp),%eax
  cltq
  imul   %rdx,%rax
  shl    $0x3,%rax
  add    %rax,-0x20(%rbp)
  mov    -0x4(%rbp),%eax
  sub    %eax,-0x10(%rbp)
  movl   $0x1,-0xc(%rbp)
L3:
  mov    -0x34(%rbp),%r9d
  mov    -0x30(%rbp),%r8d
  mov    -0x2c(%rbp),%ecx
  mov    -0x28(%rbp),%rdx
  mov    -0x20(%rbp),%rsi
  mov    -0x18(%rbp),%rax
  push   0x20(%rbp)
  push   $0x1
  mov    -0xc(%rbp),%edi
  push   %rdi
  mov    -0x10(%rbp),%edi
  push   %rdi
  mov    0x18(%rbp),%edi
  push   %rdi
  mov    0x10(%rbp),%edi
  push   %rdi
  mov    %rax,%rdi
  call   <matprod_trans2_sub_xrowscols@plt>
  add    $0x30,%rsp
L39:
  leave
  ret
```

assistant: ```c
void matprod_trans2_sub_xrows(double *restrict x, double *restrict y, double *restrict z, int n, int k, int m, int xrows, int yrows, double *sym) {
  assert(((uintptr_t)(x) & (1 - 1)) == 0);
  assert(((uintptr_t)(y) & (1 - 1)) == 0);
  assert(((uintptr_t)(z) & (1 - 1)) == 0);
  x = (x);
  y = (y);
  z = (z);
  assert(xrows <= (1024 - 64));
  int chunk;
  if (k <= 32 || k <= (chunk = (32 * (1024 - 64) / xrows) & ~7)) {
    matprod_trans2_sub_xrowscols(x, y, z, n, k, m, xrows, yrows, k, 0, 1, sym);
    return;
  }
  int xcols = k;
  int add = 0;
  while (xcols > 2 * chunk) {
    matprod_trans2_sub_xrowscols(x, y, z, n, k, m, xrows, yrows, chunk, add, 0, sym);
    x += (size_t)chunk * n;
    y += (size_t)chunk * m;
    xcols -= chunk;
    add = 1;
  }
  if (xcols > chunk) {
    int nc = ((xcols + 1) / 2) & ~3;
    matprod_trans2_sub_xrowscols(x, y, z, n, k, m, xrows, yrows, nc, add, 0, sym);
    x += (size_t)nc * n;
    y += (size_t)nc * m;
    xcols -= nc;
    add = 1;
  }
  matprod_trans2_sub_xrowscols(x, y, z, n, k, m, xrows, yrows, xcols, add, 1, sym);
}
```