user: 这段汇编代码用C语言表示是什么样的？

```asm
<oncopy_4>:
  endbr64
  push   %r15
  mov    %rdx,%r10
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %esi,-0x44(%rsp)
  sar    $0x2,%esi
  mov    %edi,-0x30(%rsp)
  mov    %ecx,-0x14(%rsp)
  mov    %esi,-0x18(%rsp)
  test   %esi,%esi
  jle    L269
  mov    %edi,%eax
  movslq %ecx,%rdx
  lea    0x0(,%rcx,4),%r11d
  mov    %esi,%r15d
  sar    $0x2,%eax
  mov    %edi,%esi
  mov    %rdx,%rcx
  movslq %r11d,%r11
  mov    %eax,-0x48(%rsp)
  sub    $0x1,%eax
  and    $0x3,%esi
  shl    $0x4,%rcx
  add    $0x1,%rax
  lea    0x0(,%rdx,8),%rbx
  lea    (%rdx,%rdx,2),%rdx
  mov    %rcx,-0x58(%rsp)
  mov    %rax,%r9
  shl    $0x7,%rax
  mov    %esi,-0x5c(%rsp)
  lea    0x0(,%rdx,8),%rcx
  mov    %rax,-0x38(%rsp)
  shl    $0x5,%r9
  movslq %esi,%rax
  shl    $0x3,%r11
  mov    %rcx,-0x50(%rsp)
  lea    -0x1(%rsi),%ecx
  lea    0x0(,%rax,8),%rsi
  shl    $0x5,%rax
  mov    %rax,-0x20(%rsp)
  mov    %edi,%eax
  add    %r10,%r9
  mov    %r10,%rdi
  and    $0x2,%eax
  mov    %ecx,-0x2c(%rsp)
  lea    0x0(,%rax,8),%r12
  shl    $0x5,%rax
  mov    %rsi,-0x68(%rsp)
  mov    %rax,-0x40(%rsp)
  mov    %ecx,%eax
  add    $0x1,%rax
  mov    %r10,-0x10(%rsp)
  shl    $0x5,%rax
  mov    %rax,-0x28(%rsp)
  jmp    L284
  nopl   0x0(%rax)
L102:
  mov    -0x5c(%rsp),%ebp
  test   %ebp,%ebp
  jne    L246
L34:
  add    %r11,%r9
  sub    $0x1,%r15d
  je     L98
L284:
  mov    -0x58(%rsp),%rax
  mov    -0x48(%rsp),%r13d
  lea    (%rbx,%rdi,1),%rdx
  lea    (%rdi,%rax,1),%rcx
  mov    -0x50(%rsp),%rax
  lea    (%rdi,%rax,1),%rsi
  mov    %rdi,%rax
  add    %r11,%rdi
  test   %r13d,%r13d
  jle    L102
  mov    %r8,%r10
  nopw   0x0(%rax,%rax,1)
L193:
  movsd  0x8(%rax),%xmm5
  movsd  (%rcx),%xmm6
  add    $0x20,%rax
  add    $0x20,%rdx
  movsd  0x8(%rcx),%xmm4
  movsd  0x10(%rcx),%xmm2
  add    $0x20,%rsi
  add    $0x20,%rcx
  movsd  -0x10(%rax),%xmm3
  movsd  -0x8(%rax),%xmm1
  movhpd -0x18(%rdx),%xmm5
  movhpd -0x20(%rsi),%xmm6
  movsd  -0x8(%rcx),%xmm0
  movsd  -0x20(%rax),%xmm7
  movhpd -0x18(%rsi),%xmm4
  movhpd -0x10(%rsi),%xmm2
  movhpd -0x10(%rdx),%xmm3
  movhpd -0x8(%rdx),%xmm1
  sub    $0xffffffffffffff80,%r10
  movhpd -0x8(%rsi),%xmm0
  movhpd -0x20(%rdx),%xmm7
  movups %xmm6,-0x70(%r10)
  movups %xmm7,-0x80(%r10)
  movups %xmm5,-0x60(%r10)
  movups %xmm4,-0x50(%r10)
  movups %xmm3,-0x40(%r10)
  movups %xmm2,-0x30(%r10)
  movups %xmm1,-0x20(%r10)
  movups %xmm0,-0x10(%r10)
  cmp    %r9,%rax
  jne    L193
  lea    (%rbx,%rax,1),%rdx
  mov    -0x5c(%rsp),%ebp
  add    -0x38(%rsp),%r8
  lea    (%rbx,%rdx,1),%rcx
  lea    (%rbx,%rcx,1),%rsi
  test   %ebp,%ebp
  je     L34
L246:
  mov    -0x68(%rsp),%rbp
  mov    -0x20(%rsp),%r14
  lea    (%rax,%rbp,1),%r10
  lea    (%r8,%r14,1),%r13
  cmp    %r10,%r8
  setae  %r14b
  cmp    %r13,%rax
  setae  %r10b
  or     %r10d,%r14d
  lea    (%rdx,%rbp,1),%r10
  cmp    %r10,%r8
  setae  %bpl
  cmp    %r13,%rdx
  setae  %r10b
  or     %ebp,%r10d
  and    %r14d,%r10d
  cmpl   $0x1,-0x2c(%rsp)
  seta   %bpl
  and    %ebp,%r10d
  mov    -0x68(%rsp),%rbp
  add    %rcx,%rbp
  cmp    %rbp,%r8
  setae  %bpl
  cmp    %r13,%rcx
  setae  %r14b
  or     %r14d,%ebp
  test   %bpl,%r10b
  je     L248
  mov    -0x68(%rsp),%rbp
  lea    (%rsi,%rbp,1),%r10
  cmp    %r10,%r8
  setae  %r10b
  cmp    %r13,%rsi
  setae  %bpl
  or     %r10b,%bpl
  je     L248
  movupd (%rax),%xmm2
  movupd (%rdx),%xmm3
  movupd (%rcx),%xmm0
  movlpd 0x8(%rax),%xmm0
  movhpd (%rcx),%xmm2
  movhpd (%rsi),%xmm3
  movupd (%rsi),%xmm1
  movlpd 0x8(%rdx),%xmm1
  movapd %xmm2,%xmm4
  unpckhpd %xmm3,%xmm2
  mov    -0x40(%rsp),%r14
  movups %xmm2,0x10(%r8)
  movapd %xmm0,%xmm2
  unpcklpd %xmm3,%xmm4
  unpckhpd %xmm1,%xmm0
  unpcklpd %xmm1,%xmm2
  movups %xmm4,(%r8)
  lea    (%r8,%r14,1),%r10
  movups %xmm2,0x20(%r8)
  movups %xmm0,0x30(%r8)
  movsd  (%rcx,%r12,1),%xmm0
  movsd  (%rax,%r12,1),%xmm1
  movhpd (%rsi,%r12,1),%xmm0
  movhpd (%rdx,%r12,1),%xmm1
  movups %xmm1,(%r10)
  movups %xmm0,0x10(%r10)
L12:
  add    -0x28(%rsp),%r8
  add    %r11,%r9
  sub    $0x1,%r15d
  jne    L284
L98:
  movslq -0x18(%rsp),%rax
  mov    -0x10(%rsp),%r10
  imul   %r11,%rax
  add    %rax,%r10
L269:
  testb  $0x2,-0x44(%rsp)
  je     L221
  movslq -0x14(%rsp),%rax
  mov    -0x30(%rsp),%r11d
  lea    0x0(,%rax,8),%rdi
  sar    $0x2,%r11d
  lea    (%r10,%rdi,1),%rsi
  add    %rsi,%rdi
  test   %r11d,%r11d
  jle    L95
  movslq %r11d,%r9
  mov    %r9,%rdx
  lea    (%rax,%r9,4),%rax
  shl    $0x6,%rdx
  lea    (%r10,%rax,8),%rax
  add    %r8,%rdx
  cmp    %rax,%r8
  setae  %cl
  cmp    %rdx,%rsi
  setae  %al
  or     %eax,%ecx
  mov    %r9,%rax
  shl    $0x5,%rax
  add    %r10,%rax
  cmp    %rax,%r8
  setae  %al
  cmp    %rdx,%r10
  setae  %dl
  or     %edx,%eax
  test   %al,%cl
  je     L44
  lea    -0x1(%r11),%eax
  cmp    $0x2,%eax
  jbe    L44
  mov    %r11d,%ebx
  mov    %r10,%rdx
  mov    %rsi,%rcx
  mov    %r8,%rax
  shr    %ebx
  shl    $0x6,%rbx
  add    %r10,%rbx
  nopw   0x0(%rax,%rax,1)
L128:
  movupd (%rdx),%xmm3
  movupd (%rcx),%xmm2
  add    $0x40,%rdx
  add    $0x40,%rcx
  movupd -0x20(%rdx),%xmm1
  movupd -0x30(%rdx),%xmm5
  sub    $0xffffffffffffff80,%rax
  movhpd -0x30(%rdx),%xmm3
  movlpd -0x38(%rdx),%xmm5
  movupd -0x10(%rdx),%xmm0
  movhpd -0x30(%rcx),%xmm2
  movhpd -0x10(%rdx),%xmm1
  movlpd -0x18(%rdx),%xmm0
  movapd %xmm3,%xmm7
  movupd -0x20(%rcx),%xmm6
  unpckhpd %xmm1,%xmm3
  unpcklpd %xmm1,%xmm7
  movapd %xmm5,%xmm1
  movupd -0x10(%rcx),%xmm4
  unpckhpd %xmm0,%xmm5
  unpcklpd %xmm0,%xmm1
  movupd -0x30(%rcx),%xmm0
  movlpd -0x38(%rcx),%xmm0
  movhpd -0x10(%rcx),%xmm6
  movlpd -0x18(%rcx),%xmm4
  movapd %xmm2,%xmm10
  unpcklpd %xmm6,%xmm10
  unpckhpd %xmm6,%xmm2
  movapd %xmm0,%xmm8
  movapd %xmm7,%xmm6
  unpckhpd %xmm3,%xmm7
  unpckhpd %xmm4,%xmm0
  unpcklpd %xmm4,%xmm8
  movapd %xmm7,%xmm4
  movapd %xmm10,%xmm7
  unpcklpd %xmm3,%xmm6
  unpcklpd %xmm2,%xmm7
  unpckhpd %xmm2,%xmm10
  movapd %xmm8,%xmm11
  movapd %xmm1,%xmm2
  movapd %xmm6,%xmm9
  unpcklpd %xmm5,%xmm2
  unpcklpd %xmm0,%xmm11
  unpckhpd %xmm5,%xmm1
  unpcklpd %xmm2,%xmm9
  movapd %xmm6,%xmm5
  movapd %xmm7,%xmm6
  unpckhpd %xmm11,%xmm7
  unpckhpd %xmm0,%xmm8
  unpckhpd %xmm2,%xmm5
  movapd %xmm7,%xmm0
  unpcklpd %xmm11,%xmm6
  movapd %xmm4,%xmm3
  movapd %xmm9,%xmm7
  unpckhpd %xmm1,%xmm4
  unpcklpd %xmm1,%xmm3
  movapd %xmm4,%xmm2
  unpcklpd %xmm6,%xmm7
  unpckhpd %xmm6,%xmm9
  movapd %xmm10,%xmm4
  movapd %xmm5,%xmm6
  unpckhpd %xmm0,%xmm5
  movups %xmm7,-0x80(%rax)
  unpcklpd %xmm8,%xmm4
  unpcklpd %xmm0,%xmm6
  movapd %xmm3,%xmm0
  movups %xmm9,-0x70(%rax)
  unpcklpd %xmm4,%xmm0
  movapd %xmm10,%xmm1
  unpckhpd %xmm4,%xmm3
  movups %xmm6,-0x60(%rax)
  unpckhpd %xmm8,%xmm1
  movups %xmm0,-0x40(%rax)
  movapd %xmm2,%xmm0
  unpcklpd %xmm1,%xmm0
  unpckhpd %xmm1,%xmm2
  movups %xmm5,-0x50(%rax)
  movups %xmm3,-0x30(%rax)
  movups %xmm0,-0x20(%rax)
  movups %xmm2,-0x10(%rax)
  cmp    %rdx,%rbx
  jne    L128
  mov    %r11d,%ebx
  and    $0xfffffffe,%ebx
  mov    %ebx,%eax
  mov    %rax,%rdx
  shl    $0x6,%rax
  shl    $0x5,%rdx
  add    %r8,%rax
  lea    (%r10,%rdx,1),%rcx
  add    %rsi,%rdx
  cmp    %ebx,%r11d
  je     L27
  movsd  0x8(%rcx),%xmm2
  movsd  0x10(%rcx),%xmm1
  movsd  0x18(%rcx),%xmm0
  movsd  (%rcx),%xmm3
  movhpd 0x8(%rdx),%xmm2
  movhpd 0x10(%rdx),%xmm1
  movhpd 0x18(%rdx),%xmm0
  movhpd (%rdx),%xmm3
  movups %xmm2,0x10(%rax)
  movups %xmm3,(%rax)
  movups %xmm1,0x20(%rax)
  movups %xmm0,0x30(%rax)
L27:
  mov    %r9,%rax
  shl    $0x6,%r9
  shl    $0x5,%rax
  add    %r9,%r8
  add    %rax,%r10
  add    %rax,%rsi
L95:
  mov    -0x30(%rsp),%edx
  and    $0x3,%edx
  je     L343
  movslq %edx,%rax
  lea    -0x1(%rdx),%ebx
  lea    0x0(,%rax,8),%r9
  mov    %rax,%rcx
  lea    (%r10,%r9,1),%r11
  shl    $0x4,%rcx
  add    %r8,%rcx
  cmp    %r11,%r8
  setae  %r11b
  cmp    %rcx,%r10
  setae  %bpl
  add    %rsi,%r9
  or     %ebp,%r11d
  cmp    %r9,%r8
  setae  %r9b
  cmp    %rcx,%rsi
  setae  %cl
  or     %r9d,%ecx
  test   %cl,%r11b
  je     L145
  cmp    $0x1,%ebx
  jbe    L145
  movupd (%r10),%xmm0
  movupd (%rsi),%xmm1
  movapd %xmm0,%xmm2
  unpckhpd %xmm1,%xmm0
  unpcklpd %xmm1,%xmm2
  movups %xmm0,0x10(%r8)
  movups %xmm2,(%r8)
  cmp    $0x2,%edx
  je     L217
L152:
  movsd  0x10(%r10),%xmm0
  movhpd 0x10(%rsi),%xmm0
  movups %xmm0,0x20(%r8)
L217:
  shl    $0x4,%rax
  mov    %rdi,%r10
  add    %rax,%r8
L221:
  testb  $0x1,-0x44(%rsp)
  je     L8
  mov    -0x30(%rsp),%edx
  sar    $0x2,%edx
  test   %edx,%edx
  jle    L35
  movslq %edx,%rdx
  xor    %eax,%eax
  shl    $0x5,%rdx
  nopl   (%rax)
L80:
  movupd 0x10(%r10,%rax,1),%xmm0
  movupd (%r10,%rax,1),%xmm7
  movups %xmm0,0x10(%r8,%rax,1)
  movups %xmm7,(%r8,%rax,1)
  add    $0x20,%rax
  cmp    %rax,%rdx
  jne    L80
  add    %rdx,%r10
  add    %rdx,%r8
L35:
  mov    -0x30(%rsp),%eax
  and    $0x3,%eax
  je     L8
  movsd  (%r10),%xmm0
  movsd  %xmm0,(%r8)
  sub    $0x1,%eax
  je     L8
  movsd  0x8(%r10),%xmm0
  movsd  %xmm0,0x8(%r8)
  cmp    $0x1,%eax
  je     L8
  movsd  0x10(%r10),%xmm0
  movsd  %xmm0,0x10(%r8)
L8:
  pop    %rbx
  xor    %eax,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L343:
  mov    %rdi,%r10
  jmp    L221
  nopl   0x0(%rax,%rax,1)
L248:
  movsd  (%rcx),%xmm0
  movsd  (%rax),%xmm1
  mov    -0x2c(%rsp),%r10d
  movhpd (%rsi),%xmm0
  movhpd (%rdx),%xmm1
  movups %xmm1,(%r8)
  movups %xmm0,0x10(%r8)
  test   %r10d,%r10d
  je     L12
  movsd  0x8(%rcx),%xmm0
  movsd  0x8(%rax),%xmm1
  cmpl   $0x2,-0x5c(%rsp)
  movhpd 0x8(%rsi),%xmm0
  movhpd 0x8(%rdx),%xmm1
  movups %xmm1,0x20(%r8)
  movups %xmm0,0x30(%r8)
  je     L12
  movsd  0x10(%rcx),%xmm0
  movsd  0x10(%rax),%xmm1
  movhpd 0x10(%rsi),%xmm0
  movhpd 0x10(%rdx),%xmm1
  movups %xmm1,0x40(%r8)
  movups %xmm0,0x50(%r8)
  jmp    L12
L145:
  movsd  (%r10),%xmm0
  movhpd (%rsi),%xmm0
  movups %xmm0,(%r8)
  test   %ebx,%ebx
  je     L217
  movsd  0x8(%r10),%xmm0
  movhpd 0x8(%rsi),%xmm0
  movups %xmm0,0x10(%r8)
  cmp    $0x1,%ebx
  jne    L152
  jmp    L217
L44:
  mov    %r9,%r11
  mov    %r8,%rcx
  mov    %rsi,%rdx
  mov    %r10,%rax
  shl    $0x5,%r11
  add    %r10,%r11
  nopl   0x0(%rax)
L142:
  movsd  (%rax),%xmm3
  add    $0x20,%rax
  add    $0x20,%rdx
  add    $0x40,%rcx
  movsd  -0x18(%rax),%xmm2
  movsd  -0x10(%rax),%xmm1
  movsd  -0x8(%rax),%xmm0
  movhpd -0x20(%rdx),%xmm3
  movhpd -0x18(%rdx),%xmm2
  movhpd -0x10(%rdx),%xmm1
  movhpd -0x8(%rdx),%xmm0
  movups %xmm3,-0x40(%rcx)
  movups %xmm2,-0x30(%rcx)
  movups %xmm1,-0x20(%rcx)
  movups %xmm0,-0x10(%rcx)
  cmp    %rax,%r11
  jne    L142
  jmp    L27
```

assistant: ```c
int oncopy_4(int m, int n, const double *a, int lda, double *b) {
  int i, j;
  const double *a_offset, *a_offset1, *a_offset2, *a_offset3, *a_offset4;
  double *b_offset;
  double ctemp1, ctemp2, ctemp3, ctemp4;
  double ctemp5, ctemp6, ctemp7, ctemp8;
  double ctemp9, ctemp10, ctemp11, ctemp12;
  double ctemp13, ctemp14, ctemp15, ctemp16;
  a_offset = a;
  b_offset = b;
  j = (n >> 2);
  if (j > 0) {
    do {
      a_offset1 = a_offset;
      a_offset2 = a_offset1 + lda;
      a_offset3 = a_offset2 + lda;
      a_offset4 = a_offset3 + lda;
      a_offset += 4 * lda;
      i = (m >> 2);
      if (i > 0) {
        do {
          ctemp1 = *(a_offset1 + 0);
          ctemp2 = *(a_offset1 + 1);
          ctemp3 = *(a_offset1 + 2);
          ctemp4 = *(a_offset1 + 3);
          ctemp5 = *(a_offset2 + 0);
          ctemp6 = *(a_offset2 + 1);
          ctemp7 = *(a_offset2 + 2);
          ctemp8 = *(a_offset2 + 3);
          ctemp9 = *(a_offset3 + 0);
          ctemp10 = *(a_offset3 + 1);
          ctemp11 = *(a_offset3 + 2);
          ctemp12 = *(a_offset3 + 3);
          ctemp13 = *(a_offset4 + 0);
          ctemp14 = *(a_offset4 + 1);
          ctemp15 = *(a_offset4 + 2);
          ctemp16 = *(a_offset4 + 3);
          *(b_offset + 0) = ctemp1;
          *(b_offset + 1) = ctemp5;
          *(b_offset + 2) = ctemp9;
          *(b_offset + 3) = ctemp13;
          *(b_offset + 4) = ctemp2;
          *(b_offset + 5) = ctemp6;
          *(b_offset + 6) = ctemp10;
          *(b_offset + 7) = ctemp14;
          *(b_offset + 8) = ctemp3;
          *(b_offset + 9) = ctemp7;
          *(b_offset + 10) = ctemp11;
          *(b_offset + 11) = ctemp15;
          *(b_offset + 12) = ctemp4;
          *(b_offset + 13) = ctemp8;
          *(b_offset + 14) = ctemp12;
          *(b_offset + 15) = ctemp16;
          a_offset1 += 4;
          a_offset2 += 4;
          a_offset3 += 4;
          a_offset4 += 4;
          b_offset += 16;
          i--;
        } while (i > 0);
      }
      i = (m & 3);
      if (i > 0) {
        do {
          ctemp1 = *(a_offset1 + 0);
          ctemp5 = *(a_offset2 + 0);
          ctemp9 = *(a_offset3 + 0);
          ctemp13 = *(a_offset4 + 0);
          *(b_offset + 0) = ctemp1;
          *(b_offset + 1) = ctemp5;
          *(b_offset + 2) = ctemp9;
          *(b_offset + 3) = ctemp13;
          a_offset1++;
          a_offset2++;
          a_offset3++;
          a_offset4++;
          b_offset += 4;
          i--;
        } while (i > 0);
      }
      j--;
    } while (j > 0);
  }
  if (n & 2) {
    a_offset1 = a_offset;
    a_offset2 = a_offset1 + lda;
    a_offset += 2 * lda;
    i = (m >> 2);
    if (i > 0) {
      do {
        ctemp1 = *(a_offset1 + 0);
        ctemp2 = *(a_offset1 + 1);
        ctemp3 = *(a_offset1 + 2);
        ctemp4 = *(a_offset1 + 3);
        ctemp5 = *(a_offset2 + 0);
        ctemp6 = *(a_offset2 + 1);
        ctemp7 = *(a_offset2 + 2);
        ctemp8 = *(a_offset2 + 3);
        *(b_offset + 0) = ctemp1;
        *(b_offset + 1) = ctemp5;
        *(b_offset + 2) = ctemp2;
        *(b_offset + 3) = ctemp6;
        *(b_offset + 4) = ctemp3;
        *(b_offset + 5) = ctemp7;
        *(b_offset + 6) = ctemp4;
        *(b_offset + 7) = ctemp8;
        a_offset1 += 4;
        a_offset2 += 4;
        b_offset += 8;
        i--;
      } while (i > 0);
    }
    i = (m & 3);
    if (i > 0) {
      do {
        ctemp1 = *(a_offset1 + 0);
        ctemp5 = *(a_offset2 + 0);
        *(b_offset + 0) = ctemp1;
        *(b_offset + 1) = ctemp5;
        a_offset1++;
        a_offset2++;
        b_offset += 2;
        i--;
      } while (i > 0);
    }
  }
  if (n & 1) {
    a_offset1 = a_offset;
    i = (m >> 2);
    if (i > 0) {
      do {
        ctemp1 = *(a_offset1 + 0);
        ctemp2 = *(a_offset1 + 1);
        ctemp3 = *(a_offset1 + 2);
        ctemp4 = *(a_offset1 + 3);
        *(b_offset + 0) = ctemp1;
        *(b_offset + 1) = ctemp2;
        *(b_offset + 2) = ctemp3;
        *(b_offset + 3) = ctemp4;
        a_offset1 += 4;
        b_offset += 4;
        i--;
      } while (i > 0);
    }
    i = (m & 3);
    if (i > 0) {
      do {
        ctemp1 = *(a_offset1 + 0);
        *(b_offset + 0) = ctemp1;
        a_offset1++;
        b_offset += 1;
        i--;
      } while (i > 0);
    }
  }
  return 0;
}
```