user: 这段汇编代码用C语言表示是什么样的?

```asm
<kern_r4_o_b>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    0x50(%rsp),%r12
  mov    %rdi,%rbx
  mov    0x38(%rsp),%r13
  mov    0x40(%rsp),%rdi
  test   %r12,%r12
  jle    L38
  mov    %rcx,%rax
  mov    %r12,%rcx
  mov    %rdx,%r10
  mov    %rsi,%r11
  shl    $0x4,%rcx
  xor    %edx,%edx
  nopl   0x0(%rax,%rax,1)
L16:
  movupd 0x0(%r13,%rdx,1),%xmm6
  movupd (%r8,%rdx,1),%xmm4
  movupd (%r9,%rdx,1),%xmm7
  movupd (%rdi,%rdx,1),%xmm3
  subpd  %xmm6,%xmm4
  movapd %xmm6,%xmm1
  movupd (%r8,%rdx,1),%xmm6
  movapd %xmm7,%xmm0
  addpd  %xmm7,%xmm3
  addpd  %xmm6,%xmm1
  movupd (%rdi,%rdx,1),%xmm6
  movapd %xmm4,%xmm2
  subpd  %xmm6,%xmm0
  shufpd $0x1,%xmm0,%xmm0
  subpd  %xmm0,%xmm2
  addpd  %xmm4,%xmm0
  movapd %xmm3,%xmm4
  addpd  %xmm1,%xmm4
  subpd  %xmm3,%xmm1
  movapd %xmm0,%xmm7
  movsd  %xmm2,%xmm7
  movsd  %xmm0,%xmm2
  movups %xmm4,(%rbx,%rdx,1)
  movups %xmm1,(%r10,%rdx,1)
  movups %xmm7,(%r11,%rdx,1)
  movups %xmm2,(%rax,%rdx,1)
  add    $0x10,%rdx
  cmp    %rdx,%rcx
  jne    L16
  mov    %r12,%rbp
  mov    %r12,%rdx
  shl    $0x6,%rbp
  shl    $0x4,%rdx
  add    %rbp,%rdi
  add    %rdx,%rbx
  add    %rdx,%r11
  add    %rdx,%r10
  cmpq   $0x1,0x58(%rsp)
  lea    (%r8,%rbp,1),%rsi
  lea    (%r9,%rbp,1),%rcx
  lea    0x0(%r13,%rbp,1),%r8
  lea    (%rax,%rdx,1),%r9
  jle    L38
  mov    %r12,%rax
  mov    0x48(%rsp),%r14
  shl    $0x5,%rax
  mov    %rax,-0x18(%rsp)
  lea    (%r12,%r12,2),%rax
  add    %rdx,%r14
  mov    $0x1,%r12d
  shl    $0x4,%rax
  lea    (%r14,%rdx,1),%r13
  mov    %rax,-0x10(%rsp)
  lea    0x0(%r13,%rdx,1),%r15
  cs nopw 0x0(%rax,%rax,1)
L9:
  movupd (%r14),%xmm3
  movupd 0x0(%r13),%xmm6
  xor    %eax,%eax
  movupd (%r15),%xmm2
  movapd %xmm3,%xmm5
  movapd %xmm6,%xmm7
  movapd %xmm2,%xmm4
  shufpd $0x1,%xmm3,%xmm5
  shufpd $0x1,%xmm6,%xmm7
  shufpd $0x1,%xmm2,%xmm4
  nopl   (%rax)
L13:
  movupd (%r8,%rax,1),%xmm1
  movupd (%r8,%rax,1),%xmm0
  movapd %xmm3,%xmm11
  movapd %xmm5,%xmm10
  movupd (%rcx,%rax,1),%xmm8
  movupd (%rcx,%rax,1),%xmm9
  movapd %xmm2,%xmm14
  unpcklpd %xmm1,%xmm1
  unpckhpd %xmm0,%xmm0
  movupd (%rdi,%rax,1),%xmm13
  mulpd  %xmm6,%xmm1
  unpckhpd %xmm8,%xmm8
  unpcklpd %xmm9,%xmm9
  mulpd  %xmm7,%xmm0
  unpcklpd %xmm13,%xmm13
  mulpd  %xmm8,%xmm11
  mulpd  %xmm9,%xmm10
  mulpd  %xmm3,%xmm9
  mulpd  %xmm5,%xmm8
  movapd %xmm1,%xmm12
  subpd  %xmm0,%xmm12
  addpd  %xmm1,%xmm0
  movapd %xmm11,%xmm15
  addpd  %xmm10,%xmm15
  subpd  %xmm11,%xmm10
  movapd %xmm0,%xmm1
  movupd (%rdi,%rax,1),%xmm0
  movsd  %xmm12,%xmm1
  movapd %xmm4,%xmm12
  mulpd  %xmm13,%xmm12
  unpckhpd %xmm0,%xmm0
  movsd  %xmm15,%xmm10
  movupd (%rsi,%rax,1),%xmm15
  mulpd  %xmm0,%xmm14
  mulpd  %xmm2,%xmm13
  mulpd  %xmm4,%xmm0
  movapd %xmm14,%xmm11
  addpd  %xmm12,%xmm11
  subpd  %xmm14,%xmm12
  movsd  %xmm11,%xmm12
  movapd %xmm13,%xmm11
  subpd  %xmm0,%xmm11
  addpd  %xmm13,%xmm0
  subpd  %xmm12,%xmm10
  movsd  %xmm11,%xmm0
  movapd %xmm9,%xmm11
  subpd  %xmm8,%xmm11
  addpd  %xmm9,%xmm8
  movupd (%rsi,%rax,1),%xmm9
  subpd  %xmm1,%xmm9
  addpd  %xmm15,%xmm1
  movsd  %xmm11,%xmm8
  addpd  %xmm8,%xmm0
  movapd %xmm9,%xmm8
  subpd  %xmm10,%xmm8
  addpd  %xmm9,%xmm10
  movapd %xmm0,%xmm9
  addpd  %xmm1,%xmm9
  subpd  %xmm0,%xmm1
  movups %xmm1,(%r10,%rax,1)
  movapd %xmm10,%xmm1
  movsd  %xmm8,%xmm1
  movsd  %xmm10,%xmm8
  movups %xmm9,(%rbx,%rax,1)
  movups %xmm1,(%r11,%rax,1)
  movups %xmm8,(%r9,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%rdx
  jne    L13
  add    %rbp,%rsi
  add    %rbp,%rcx
  add    %rbp,%r8
  add    %rbp,%rdi
  add    %rdx,%rbx
  add    %rdx,%r11
  add    %rdx,%r10
  add    %rdx,%r9
  add    $0x1,%r12
  add    %rdx,%r14
  add    -0x18(%rsp),%r13
  add    -0x10(%rsp),%r15
  cmp    %r12,0x58(%rsp)
  jne    L9
L38:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void kern_r4_o_b(double *restrict o0, double *restrict o1, double *restrict o2, double *restrict o3, double *i0, double *i1, double *i2, double *i3, double *w, long bsize, long blocks) {
  long i, j;
  for (j = 0; j < bsize; j++) {
    double qr0, qi0;
    double qr1, qi1;
    double qr2, qi2;
    double qr3, qi3;
    qr0 = i0[2 * j] + i2[2 * j];
    qr2 = i0[2 * j] - i2[2 * j];
    qi0 = i0[2 * j + 1] + i2[2 * j + 1];
    qi2 = i0[2 * j + 1] - i2[2 * j + 1];
    qr1 = i1[2 * j] + i3[2 * j];
    qr3 = i1[2 * j] - i3[2 * j];
    qi1 = i1[2 * j + 1] + i3[2 * j + 1];
    qi3 = i1[2 * j + 1] - i3[2 * j + 1];
    o0[2 * j] = qr0 + qr1;
    o0[2 * j + 1] = qi0 + qi1;
    o2[2 * j] = qr0 - qr1;
    o2[2 * j + 1] = qi0 - qi1;
    o1[2 * j] = qr2 - qi3;
    o1[2 * j + 1] = qi2 + qr3;
    o3[2 * j] = qr2 + qi3;
    o3[2 * j + 1] = qi2 - qr3;
  }
  i0 += 8 * bsize;
  i1 += 8 * bsize;
  i2 += 8 * bsize;
  i3 += 8 * bsize;
  o0 += 2 * bsize;
  o1 += 2 * bsize;
  o2 += 2 * bsize;
  o3 += 2 * bsize;
  for (i = 1; i < blocks; i++) {
    double wr1, wi1;
    double wr2, wi2;
    double wr3, wi3;
    wr1 = w[2 * i * bsize];
    wi1 = w[2 * i * bsize + 1];
    wr2 = w[4 * i * bsize];
    wi2 = w[4 * i * bsize + 1];
    wr3 = w[6 * i * bsize];
    wi3 = w[6 * i * bsize + 1];
    for (j = 0; j < bsize; j++) {
      double pr1, pi1;
      double pr2, pi2;
      double pr3, pi3;
      double qr0, qi0;
      double qr1, qi1;
      double qr2, qi2;
      double qr3, qi3;
      pr1 = i1[2 * j] * wr1 - i1[2 * j + 1] * wi1;
      pi1 = i1[2 * j] * wi1 + i1[2 * j + 1] * wr1;
      pr2 = i2[2 * j] * wr2 - i2[2 * j + 1] * wi2;
      pi2 = i2[2 * j] * wi2 + i2[2 * j + 1] * wr2;
      pr3 = i3[2 * j] * wr3 - i3[2 * j + 1] * wi3;
      pi3 = i3[2 * j] * wi3 + i3[2 * j + 1] * wr3;
      qr0 = i0[2 * j] + pr2;
      qr2 = i0[2 * j] - pr2;
      qi0 = i0[2 * j + 1] + pi2;
      qi2 = i0[2 * j + 1] - pi2;
      qr1 = pr1 + pr3;
      qr3 = pr1 - pr3;
      qi1 = pi1 + pi3;
      qi3 = pi1 - pi3;
      o0[2 * j] = qr0 + qr1;
      o0[2 * j + 1] = qi0 + qi1;
      o2[2 * j] = qr0 - qr1;
      o2[2 * j + 1] = qi0 - qi1;
      o1[2 * j] = qr2 - qi3;
      o1[2 * j + 1] = qi2 + qr3;
      o3[2 * j] = qr2 + qi3;
      o3[2 * j + 1] = qi2 - qr3;
    }
    i0 += 8 * bsize;
    i1 += 8 * bsize;
    i2 += 8 * bsize;
    i3 += 8 * bsize;
    o0 += 2 * bsize;
    o1 += 2 * bsize;
    o2 += 2 * bsize;
    o3 += 2 * bsize;
  }
}
```