user: 这段汇编代码用C语言表示是什么样的：

```asm
<split_matrix_fix_3f>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  lea    (%rdi,%rdi,2),%ebx
  mov    %ebx,%eax
  mov    %edi,-0x34(%rsp)
  mov    %rdx,-0x48(%rsp)
  mov    %edi,%edx
  lea    (%rsi,%rsi,2),%edi
  sub    %edi,%eax
  mov    %esi,-0x40(%rsp)
  mov    %rcx,-0x20(%rsp)
  mov    %r8,-0x18(%rsp)
  mov    %r9,-0x10(%rsp)
  mov    %ebx,-0x8(%rsp)
  mov    %edi,-0x38(%rsp)
  mov    %eax,-0x4(%rsp)
  test   %esi,%esi
  jle    L72
  lea    (%rdx,%rdx,8),%r11d
  movslq %ebx,%r8
  movslq %edi,%rbx
  mov    %edi,%ebp
  movslq %r11d,%rax
  shl    $0x3,%r8
  xor    %r15d,%r15d
  xor    %r14d,%r14d
  mov    %rax,-0x30(%rsp)
  lea    (%rsi,%rsi,8),%eax
  shl    $0x3,%rbx
  xor    %r13d,%r13d
  cltq
  xor    %r12d,%r12d
  mov    %rax,-0x28(%rsp)
  nopl   0x0(%rax)
L213:
  mov    -0x48(%rsp),%rax
  mov    %r13d,%edi
  lea    (%rax,%r14,8),%r10
  mov    -0x20(%rsp),%rax
  lea    (%rax,%r15,8),%r9
  nopl   (%rax)
L62:
  mov    %r9,%rcx
  mov    %r10,%rdx
  mov    $0x3,%esi
L164:
  xor    %eax,%eax
L185:
  movsd  (%rdx,%rax,1),%xmm0
  movsd  %xmm0,(%rcx,%rax,1)
  add    $0x8,%rax
  cmp    $0x18,%rax
  jne    L185
  add    %r8,%rdx
  add    %rbx,%rcx
  sub    $0x1,%esi
  jne    L164
  add    $0x3,%edi
  add    $0x18,%r10
  add    $0x18,%r9
  cmp    %ebp,%edi
  jne    L62
  lea    (%rdi,%r11,1),%ebp
  add    $0x3,%r12d
  add    %r11d,%r13d
  add    -0x30(%rsp),%r14
  add    -0x28(%rsp),%r15
  cmp    %r12d,-0x38(%rsp)
  jne    L213
  mov    -0x34(%rsp),%eax
  sub    -0x40(%rsp),%eax
  xor    %r14d,%r14d
  xor    %r13d,%r13d
  lea    (%rax,%rax,2),%r12d
  mov    -0x38(%rsp),%eax
  movslq -0x4(%rsp),%rbp
  mov    %rax,-0x30(%rsp)
  lea    0x0(%rbp,%rbp,2),%r15d
  shl    $0x3,%rbp
  nopl   0x0(%rax,%rax,1)
L171:
  mov    -0x40(%rsp),%ebx
  cmp    %ebx,-0x34(%rsp)
  jle    L147
  mov    -0x48(%rsp),%rbx
  mov    -0x18(%rsp),%rdi
  movslq %r14d,%rax
  mov    %r13d,%r9d
  add    -0x30(%rsp),%rax
  lea    (%rbx,%rax,8),%rbx
  movslq %r13d,%rax
  lea    (%rdi,%rax,8),%r10
  nopw   0x0(%rax,%rax,1)
L80:
  mov    %r10,%rcx
  mov    %rbx,%rdx
  mov    $0x3,%edi
L151:
  xor    %eax,%eax
L53:
  movsd  (%rdx,%rax,1),%xmm0
  movsd  %xmm0,(%rcx,%rax,1)
  add    $0x8,%rax
  cmp    $0x18,%rax
  jne    L53
  add    %r8,%rdx
  add    %rbp,%rcx
  sub    $0x1,%edi
  jne    L151
  add    $0x3,%r9d
  add    $0x18,%rbx
  add    $0x18,%r10
  cmp    %r12d,%r9d
  jne    L80
L147:
  add    %r15d,%r12d
  add    $0x3,%esi
  add    %r15d,%r13d
  add    %r11d,%r14d
  cmp    -0x38(%rsp),%esi
  jne    L171
L72:
  mov    -0x34(%rsp),%eax
  mov    -0x40(%rsp),%edi
  cmp    %edi,%eax
  jle    L108
  mov    -0x8(%rsp),%esi
  lea    (%rax,%rax,8),%eax
  movslq -0x38(%rsp),%r8
  lea    (%rdi,%rdi,2),%ebp
  cltq
  mov    %ebp,-0x38(%rsp)
  mov    %ebp,%r14d
  xor    %r13d,%r13d
  mov    %rax,-0x30(%rsp)
  mov    %esi,%eax
  lea    0x1(%rsi),%ebx
  mov    %esi,%r12d
  imul   %edi,%eax
  lea    (%rsi,%rsi,2),%r15d
  shl    $0x3,%r8
  imul   %ebp,%ebx
  imul   %ebp,%r12d
  lea    (%rax,%rax,2),%eax
  cltq
  mov    %rax,-0x28(%rsp)
  lea    (%rdi,%rdi,8),%eax
  movslq %esi,%rdi
  shl    $0x3,%rdi
  mov    %eax,%ebp
  nop
L61:
  mov    -0x40(%rsp),%eax
  test   %eax,%eax
  jle    L68
  mov    -0x48(%rsp),%rsi
  movslq %r12d,%rax
  mov    %r12d,%r9d
  lea    (%rsi,%rax,8),%r11
  mov    -0x10(%rsp),%rsi
  movslq %r13d,%rax
  lea    (%rsi,%rax,8),%r10
  nopl   0x0(%rax,%rax,1)
L120:
  mov    %r10,%rcx
  mov    %r11,%rdx
  mov    $0x3,%esi
L82:
  xor    %eax,%eax
L123:
  movsd  (%rdx,%rax,1),%xmm0
  movsd  %xmm0,(%rcx,%rax,1)
  add    $0x8,%rax
  cmp    $0x18,%rax
  jne    L123
  add    %rdi,%rdx
  add    %r8,%rcx
  sub    $0x1,%esi
  jne    L82
  add    $0x3,%r9d
  add    $0x18,%r11
  add    $0x18,%r10
  cmp    %ebx,%r9d
  jne    L120
L68:
  add    %r15d,%ebx
  lea    0x3(%r14),%eax
  add    %r15d,%r12d
  add    %ebp,%r13d
  cmp    %eax,-0x8(%rsp)
  je     L217
  mov    %eax,%r14d
  jmp    L61
L108:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L217:
  mov    -0x4(%rsp),%esi
  mov    -0x34(%rsp),%eax
  xor    %r13d,%r13d
  xor    %r12d,%r12d
  sub    -0x40(%rsp),%eax
  add    -0x48(%rsp),%r8
  lea    (%rsi,%rsi,2),%r15d
  lea    (%rax,%rax,2),%ebx
  mov    %r8,-0x48(%rsp)
  mov    -0x38(%rsp),%ebp
  movslq %r15d,%rax
  mov    %r14d,-0x38(%rsp)
  movslq %esi,%r8
  mov    -0x28(%rsp),%r14
  mov    %rax,-0x40(%rsp)
  shl    $0x3,%r8
  nopl   0x0(%rax,%rax,1)
L79:
  mov    -0x48(%rsp),%rax
  mov    %r12d,%r9d
  lea    (%rax,%r14,8),%r11
  mov    0x38(%rsp),%rax
  lea    (%rax,%r13,8),%r10
  nopl   (%rax)
L109:
  mov    %r10,%rcx
  mov    %r11,%rdx
  mov    $0x3,%esi
L76:
  xor    %eax,%eax
L141:
  movsd  (%rdx,%rax,1),%xmm0
  movsd  %xmm0,(%rcx,%rax,1)
  add    $0x8,%rax
  cmp    $0x18,%rax
  jne    L141
  add    %rdi,%rdx
  add    %r8,%rcx
  sub    $0x1,%esi
  jne    L76
  add    $0x3,%r9d
  add    $0x18,%r11
  add    $0x18,%r10
  cmp    %r9d,%ebx
  jne    L109
  add    %r15d,%ebx
  lea    0x3(%rbp),%eax
  add    %r15d,%r12d
  add    -0x30(%rsp),%r14
  add    -0x40(%rsp),%r13
  cmp    -0x38(%rsp),%ebp
  je     L108
  mov    %eax,%ebp
  jmp    L79
```

assistant: ```c
void split_matrix_fix_3f(int np, int nm, const double *mat, double *mat_ll, double *mat_lh, double *mat_hl, double *mat_hh) {
  int i, j;
  int ii, jj;
  int i3, j3;
  int n3;
  int nl, nh;
  n3 = np * 3;
  nl = nm * 3;
  nh = n3 - nl;
  for (i = 0; i < nm; ++i) {
    i3 = i * 3;
    for (j = 0; j < nm; ++j) {
      j3 = j * 3;
      for (ii = 0; ii < 3; ++ii) {
        for (jj = 0; jj < 3; ++jj) {
          mat_ll[(i3 + ii) * nl + j3 + jj] = mat[(i3 + ii) * n3 + j3 + jj];
        }
      }
    }
  }
  for (i = 0; i < nm; ++i) {
    i3 = i * 3;
    for (j = nm; j < np; ++j) {
      j3 = j * 3;
      for (ii = 0; ii < 3; ++ii) {
        for (jj = 0; jj < 3; ++jj) {
          mat_lh[(i3 + ii) * nh + (j - nm) * 3 + jj] = mat[(i3 + ii) * n3 + j3 + jj];
        }
      }
    }
  }
  for (i = nm; i < np; ++i) {
    i3 = i * 3;
    for (j = 0; j < nm; ++j) {
      j3 = j * 3;
      for (ii = 0; ii < 3; ++ii) {
        for (jj = 0; jj < 3; ++jj) {
          mat_hl[((i - nm) * 3 + ii) * nl + j3 + jj] = mat[(i3 + ii) * n3 + j3 + jj];
        }
      }
    }
  }
  for (i = nm; i < np; ++i) {
    i3 = i * 3;
    for (j = nm; j < np; ++j) {
      j3 = j * 3;
      for (ii = 0; ii < 3; ++ii) {
        for (jj = 0; jj < 3; ++jj) {
          mat_hh[((i - nm) * 3 + ii) * nh + (j - nm) * 3 + jj] = mat[(i3 + ii) * n3 + j3 + jj];
        }
      }
    }
  }
}
```