user: What is the c source code of the assembly code below:

```asm
<kern_r8_n_f>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0xd0,%rsp
  mov    %rdi,0x68(%rsp)
  mov    %rsi,0x70(%rsp)
  mov    %rdx,0x78(%rsp)
  mov    %rcx,0x80(%rsp)
  mov    %r8,0x88(%rsp)
  mov    %r9,0x90(%rsp)
  mov    0x118(%rsp),%r10
  mov    0x120(%rsp),%r11
  mov    0x128(%rsp),%r15
  mov    0x130(%rsp),%rdx
  mov    0x138(%rsp),%rcx
  mov    0x140(%rsp),%rsi
  mov    0x148(%rsp),%rdi
  mov    0x150(%rsp),%r8
  cmpq   $0x0,0x168(%rsp)
  jle    L13
  mov    0x160(%rsp),%rax
  shl    $0x7,%rax
  mov    %rax,0x98(%rsp)
  mov    0x160(%rsp),%rax
  shl    $0x4,%rax
  mov    %rax,-0x20(%rsp)
  mov    0x160(%rsp),%rax
  shl    $0x6,%rax
  mov    %rax,0xa8(%rsp)
  mov    0x158(%rsp),%rax
  mov    %rax,0x50(%rsp)
  mov    0x160(%rsp),%rax
  shl    $0x5,%rax
  mov    %rax,0xa0(%rsp)
  mov    0x160(%rsp),%rax
  add    %rax,%rax
  mov    %rax,%r9
  add    0x160(%rsp),%r9
  shl    $0x5,%r9
  mov    %r9,0xc0(%rsp)
  add    0x160(%rsp),%rax
  shl    $0x4,%rax
  mov    %rax,0xc8(%rsp)
  mov    0x168(%rsp),%rax
  imul   0x160(%rsp),%rax
  mov    %rax,%r9
  shl    $0x4,%r9
  add    0x158(%rsp),%r9
  mov    %r9,0xb0(%rsp)
  lea    (%rax,%rax,2),%rax
  shl    $0x4,%rax
  add    0x158(%rsp),%rax
  mov    %rax,0xb8(%rsp)
  mov    0x158(%rsp),%rax
  mov    %rax,0x40(%rsp)
  mov    %rax,0x48(%rsp)
  movq   $0x0,0x30(%rsp)
  movq   $0x0,0x60(%rsp)
  movq   $0x0,0x58(%rsp)
  movq   $0x0,0x38(%rsp)
L6:
  mov    0x58(%rsp),%rax
  mov    %rax,%r13
  add    0x110(%rsp),%r13
  mov    0x80(%rsp),%r12
  add    %rax,%r12
  mov    %rax,%rbp
  add    0x108(%rsp),%rbp
  mov    0x78(%rsp),%rbx
  add    %rax,%rbx
  mov    %rbx,-0x78(%rsp)
  mov    0x90(%rsp),%r9
  add    %rax,%r9
  mov    %r9,0x28(%rsp)
  mov    0x70(%rsp),%r14
  add    %rax,%r14
  mov    0x88(%rsp),%r9
  add    %rax,%r9
  mov    %r9,0x20(%rsp)
  mov    0x68(%rsp),%r9
  add    %rax,%r9
  mov    %r9,0x18(%rsp)
  mov    0x50(%rsp),%rax
  movsd  (%rax),%xmm7
  movsd  %xmm7,-0x18(%rsp)
  movsd  0x8(%rax),%xmm7
  movsd  %xmm7,-0x10(%rsp)
  mov    0x48(%rsp),%rax
  movsd  (%rax),%xmm7
  movsd  %xmm7,-0x8(%rsp)
  movsd  0x8(%rax),%xmm7
  movsd  %xmm7,(%rsp)
  mov    0x40(%rsp),%rax
  movsd  (%rax),%xmm7
  movsd  %xmm7,0x8(%rsp)
  movsd  0x8(%rax),%xmm7
  movsd  %xmm7,0x10(%rsp)
  mov    0x158(%rsp),%r9
  mov    0x60(%rsp),%rax
  movsd  (%r9,%rax,1),%xmm7
  movsd  %xmm7,-0x70(%rsp)
  movsd  0x8(%r9,%rax,1),%xmm7
  movsd  %xmm7,-0x68(%rsp)
  mov    %r9,%rbx
  mov    0x30(%rsp),%r9
  movsd  (%rbx,%r9,1),%xmm7
  movsd  %xmm7,-0x60(%rsp)
  movsd  0x8(%rbx,%r9,1),%xmm7
  movsd  %xmm7,-0x58(%rsp)
  mov    0xb0(%rsp),%r9
  movsd  (%r9,%rax,1),%xmm7
  movsd  %xmm7,-0x50(%rsp)
  movsd  0x8(%r9,%rax,1),%xmm7
  movsd  %xmm7,-0x48(%rsp)
  mov    0xb8(%rsp),%r9
  mov    0x30(%rsp),%rax
  movsd  (%r9,%rax,1),%xmm7
  movsd  %xmm7,-0x40(%rsp)
  movsd  0x8(%r9,%rax,1),%xmm0
  movsd  %xmm0,-0x38(%rsp)
  cmpq   $0x0,0x160(%rsp)
  jle    L2
  mov    $0x0,%eax
  mov    -0x78(%rsp),%rbx
L8:
  movsd  (%rsi,%rax,1),%xmm1
  movsd  0x8(%rsi,%rax,1),%xmm4
  movsd  -0x18(%rsp),%xmm6
  movapd %xmm6,%xmm0
  mulsd  %xmm1,%xmm0
  movsd  -0x10(%rsp),%xmm9
  movapd %xmm9,%xmm2
  mulsd  %xmm4,%xmm2
  addsd  %xmm2,%xmm0
  mulsd  %xmm6,%xmm4
  mulsd  %xmm9,%xmm1
  subsd  %xmm1,%xmm4
  movsd  (%r8,%rax,1),%xmm1
  movsd  0x8(%r8,%rax,1),%xmm7
  movapd %xmm6,%xmm3
  mulsd  %xmm1,%xmm3
  movapd %xmm9,%xmm2
  mulsd  %xmm7,%xmm2
  addsd  %xmm2,%xmm3
  mulsd  %xmm6,%xmm7
  mulsd  %xmm9,%xmm1
  subsd  %xmm1,%xmm7
  movsd  (%r15,%rax,1),%xmm1
  movsd  0x8(%r15,%rax,1),%xmm2
  movsd  -0x8(%rsp),%xmm8
  movapd %xmm8,%xmm13
  mulsd  %xmm1,%xmm13
  movsd  (%rsp),%xmm10
  movapd %xmm10,%xmm5
  mulsd  %xmm2,%xmm5
  addsd  %xmm5,%xmm13
  mulsd  %xmm8,%xmm2
  mulsd  %xmm10,%xmm1
  subsd  %xmm1,%xmm2
  movapd %xmm2,%xmm15
  movsd  (%rcx,%rax,1),%xmm2
  movsd  0x8(%rcx,%rax,1),%xmm14
  movapd %xmm6,%xmm1
  mulsd  %xmm2,%xmm1
  movapd %xmm9,%xmm5
  mulsd  %xmm14,%xmm5
  addsd  %xmm5,%xmm1
  mulsd  %xmm6,%xmm14
  mulsd  %xmm9,%xmm2
  subsd  %xmm2,%xmm14
  movsd  (%rdi,%rax,1),%xmm2
  movsd  0x8(%rdi,%rax,1),%xmm6
  movsd  0x8(%rsp),%xmm11
  movapd %xmm11,%xmm8
  mulsd  %xmm2,%xmm8
  movsd  0x10(%rsp),%xmm10
  movapd %xmm10,%xmm5
  mulsd  %xmm6,%xmm5
  addsd  %xmm5,%xmm8
  mulsd  %xmm11,%xmm6
  mulsd  %xmm10,%xmm2
  subsd  %xmm2,%xmm6
  movsd  (%r11,%rax,1),%xmm11
  movapd %xmm11,%xmm12
  addsd  %xmm0,%xmm12
  subsd  %xmm0,%xmm11
  movsd  0x8(%r11,%rax,1),%xmm0
  movapd %xmm0,%xmm2
  addsd  %xmm4,%xmm2
  subsd  %xmm4,%xmm0
  movsd  (%rdx,%rax,1),%xmm10
  movapd %xmm10,%xmm5
  addsd  %xmm3,%xmm5
  subsd  %xmm3,%xmm10
  movsd  0x8(%rdx,%rax,1),%xmm4
  movapd %xmm4,%xmm3
  addsd  %xmm7,%xmm3
  subsd  %xmm7,%xmm4
  movsd  (%r10,%rax,1),%xmm9
  movapd %xmm9,%xmm7
  addsd  %xmm1,%xmm7
  subsd  %xmm1,%xmm9
  movsd  %xmm9,-0x30(%rsp)
  movsd  0x8(%r10,%rax,1),%xmm1
  movapd %xmm1,%xmm9
  addsd  %xmm14,%xmm9
  subsd  %xmm14,%xmm1
  movapd %xmm13,%xmm14
  addsd  %xmm8,%xmm14
  subsd  %xmm8,%xmm13
  movapd %xmm15,%xmm8
  addsd  %xmm6,%xmm8
  subsd  %xmm6,%xmm15
  movsd  %xmm15,-0x78(%rsp)
  movsd  -0x70(%rsp),%xmm6
  mulsd  %xmm12,%xmm6
  movsd  -0x68(%rsp),%xmm15
  mulsd  %xmm2,%xmm15
  addsd  %xmm15,%xmm6
  mulsd  -0x70(%rsp),%xmm2
  mulsd  -0x68(%rsp),%xmm12
  subsd  %xmm12,%xmm2
  movsd  -0x60(%rsp),%xmm12
  mulsd  %xmm5,%xmm12
  movapd %xmm12,%xmm15
  movsd  -0x58(%rsp),%xmm12
  mulsd  %xmm3,%xmm12
  addsd  %xmm12,%xmm15
  mulsd  -0x60(%rsp),%xmm3
  mulsd  -0x58(%rsp),%xmm5
  subsd  %xmm5,%xmm3
  movsd  -0x50(%rsp),%xmm5
  mulsd  %xmm11,%xmm5
  movsd  -0x48(%rsp),%xmm12
  mulsd  %xmm0,%xmm12
  addsd  %xmm12,%xmm5
  mulsd  -0x50(%rsp),%xmm0
  mulsd  -0x48(%rsp),%xmm11
  subsd  %xmm11,%xmm0
  movsd  -0x40(%rsp),%xmm12
  mulsd  %xmm10,%xmm12
  movsd  -0x38(%rsp),%xmm11
  mulsd  %xmm4,%xmm11
  addsd  %xmm11,%xmm12
  mulsd  -0x40(%rsp),%xmm4
  mulsd  -0x38(%rsp),%xmm10
  subsd  %xmm10,%xmm4
  movapd %xmm7,%xmm11
  addsd  %xmm14,%xmm11
  movapd %xmm9,%xmm10
  addsd  %xmm8,%xmm10
  subsd  %xmm14,%xmm7
  subsd  %xmm8,%xmm9
  movsd  %xmm9,-0x28(%rsp)
  movsd  -0x30(%rsp),%xmm14
  movapd %xmm14,%xmm9
  addsd  -0x78(%rsp),%xmm9
  movapd %xmm1,%xmm8
  subsd  %xmm13,%xmm8
  subsd  -0x78(%rsp),%xmm14
  addsd  %xmm13,%xmm1
  movapd %xmm6,%xmm13
  addsd  %xmm15,%xmm13
  movsd  %xmm13,-0x78(%rsp)
  movapd %xmm2,%xmm13
  addsd  %xmm3,%xmm13
  subsd  %xmm15,%xmm6
  subsd  %xmm3,%xmm2
  movapd %xmm5,%xmm15
  addsd  %xmm12,%xmm15
  movapd %xmm0,%xmm3
  addsd  %xmm4,%xmm3
  subsd  %xmm12,%xmm5
  subsd  %xmm4,%xmm0
  movsd  -0x78(%rsp),%xmm12
  movapd %xmm12,%xmm4
  addsd  %xmm11,%xmm4
  mov    0x18(%rsp),%r9
  movsd  %xmm4,(%r9,%rax,1)
  movapd %xmm10,%xmm4
  addsd  %xmm13,%xmm4
  movsd  %xmm4,0x8(%r9,%rax,1)
  subsd  %xmm12,%xmm11
  mov    0x20(%rsp),%r9
  movsd  %xmm11,(%r9,%rax,1)
  subsd  %xmm13,%xmm10
  movsd  %xmm10,0x8(%r9,%rax,1)
  movapd %xmm9,%xmm4
  addsd  %xmm15,%xmm4
  movsd  %xmm4,(%r14,%rax,1)
  movapd %xmm8,%xmm4
  addsd  %xmm3,%xmm4
  movsd  %xmm4,0x8(%r14,%rax,1)
  subsd  %xmm15,%xmm9
  mov    0x28(%rsp),%r9
  movsd  %xmm9,(%r9,%rax,1)
  subsd  %xmm3,%xmm8
  movsd  %xmm8,0x8(%r9,%rax,1)
  movapd %xmm7,%xmm3
  addsd  %xmm2,%xmm3
  movsd  %xmm3,(%rbx,%rax,1)
  movsd  -0x28(%rsp),%xmm4
  movapd %xmm4,%xmm3
  subsd  %xmm6,%xmm3
  movsd  %xmm3,0x8(%rbx,%rax,1)
  subsd  %xmm2,%xmm7
  movsd  %xmm7,0x0(%rbp,%rax,1)
  addsd  %xmm4,%xmm6
  movsd  %xmm6,0x8(%rbp,%rax,1)
  movapd %xmm14,%xmm2
  addsd  %xmm0,%xmm2
  movsd  %xmm2,(%r12,%rax,1)
  movapd %xmm1,%xmm2
  subsd  %xmm5,%xmm2
  movsd  %xmm2,0x8(%r12,%rax,1)
  movapd %xmm14,%xmm2
  subsd  %xmm0,%xmm2
  movsd  %xmm2,0x0(%r13,%rax,1)
  addsd  %xmm5,%xmm1
  movsd  %xmm1,0x8(%r13,%rax,1)
  add    $0x10,%rax
  cmp    %rax,-0x20(%rsp)
  jne    L8
L2:
  mov    0x98(%rsp),%rax
  add    %rax,%r10
  add    %rax,%r11
  add    %rax,%r15
  add    %rax,%rdx
  add    %rax,%rcx
  add    %rax,%rsi
  add    %rax,%rdi
  add    %rax,%r8
  addq   $0x1,0x38(%rsp)
  mov    0x38(%rsp),%rax
  mov    -0x20(%rsp),%r14
  add    %r14,0x58(%rsp)
  mov    0xa8(%rsp),%r9
  add    %r9,0x50(%rsp)
  mov    0xa0(%rsp),%r9
  add    %r9,0x48(%rsp)
  mov    0xc0(%rsp),%r9
  add    %r9,0x40(%rsp)
  add    %r14,0x60(%rsp)
  mov    0xc8(%rsp),%r14
  add    %r14,0x30(%rsp)
  cmp    %rax,0x168(%rsp)
  jne    L6
L13:
  add    $0xd0,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void kern_r8_n_f(double *restrict o0, double *restrict o1, double *restrict o2, double *restrict o3, double *restrict o4, double *restrict o5, double *restrict o6, double *restrict o7, double *i0, double *i1, double *i2, double *i3, double *i4, double *i5, double *i6, double *i7, double *w, long bsize, long blocks) {
  long i, j;
  for (i = 0; i < blocks; i++) {
    double wr1, wi1;
    double wr2, wi2;
    double wr3, wi3;
    double wr4, wi4;
    double wr5, wi5;
    double wr6, wi6;
    double wr7, wi7;
    wr4 = w[8 * i * bsize];
    wi4 = w[8 * i * bsize + 1];
    wr2 = w[4 * i * bsize];
    wi2 = w[4 * i * bsize + 1];
    wr6 = w[12 * i * bsize];
    wi6 = w[12 * i * bsize + 1];
    wr1 = w[2 * i * bsize];
    wi1 = w[2 * i * bsize + 1];
    wr3 = w[6 * i * bsize];
    wi3 = w[6 * i * bsize + 1];
    wr5 = w[2 * i * bsize + 2 * blocks * bsize];
    wi5 = w[2 * i * bsize + 2 * blocks * bsize + 1];
    wr7 = w[6 * i * bsize + 6 * blocks * bsize];
    wi7 = w[6 * i * bsize + 6 * blocks * bsize + 1];
    for (j = 0; j < bsize; j++) {
      double pr2, pi2;
      double pr4, pi4;
      double pr5, pi5;
      double pr6, pi6;
      double pr7, pi7;
      double sr1, si1;
      double sr3, si3;
      double sr5, si5;
      double sr7, si7;
      double qr0, qi0;
      double qr1, qi1;
      double qr2, qi2;
      double qr3, qi3;
      double qr4, qi4;
      double qr5, qi5;
      double qr6, qi6;
      double qr7, qi7;
      double tr0, ti0;
      double tr1, ti1;
      double tr2, ti2;
      double tr3, ti3;
      double tr4, ti4;
      double tr5, ti5;
      double tr6, ti6;
      double tr7, ti7;
      pr5 = i5[2 * j] * wr4 + i5[2 * j + 1] * wi4;
      pi5 = i5[2 * j + 1] * wr4 - i5[2 * j] * wi4;
      pr7 = i7[2 * j] * wr4 + i7[2 * j + 1] * wi4;
      pi7 = i7[2 * j + 1] * wr4 - i7[2 * j] * wi4;
      pr2 = i2[2 * j] * wr2 + i2[2 * j + 1] * wi2;
      pi2 = i2[2 * j + 1] * wr2 - i2[2 * j] * wi2;
      pr4 = i4[2 * j] * wr4 + i4[2 * j + 1] * wi4;
      pi4 = i4[2 * j + 1] * wr4 - i4[2 * j] * wi4;
      pr6 = i6[2 * j] * wr6 + i6[2 * j + 1] * wi6;
      pi6 = i6[2 * j + 1] * wr6 - i6[2 * j] * wi6;
      sr1 = i1[2 * j] + pr5;
      sr5 = i1[2 * j] - pr5;
      si1 = i1[2 * j + 1] + pi5;
      si5 = i1[2 * j + 1] - pi5;
      sr3 = i3[2 * j] + pr7;
      sr7 = i3[2 * j] - pr7;
      si3 = i3[2 * j + 1] + pi7;
      si7 = i3[2 * j + 1] - pi7;
      qr0 = i0[2 * j] + pr4;
      qr4 = i0[2 * j] - pr4;
      qi0 = i0[2 * j + 1] + pi4;
      qi4 = i0[2 * j + 1] - pi4;
      qr2 = pr2 + pr6;
      qr6 = pr2 - pr6;
      qi2 = pi2 + pi6;
      qi6 = pi2 - pi6;
      qr1 = sr1 * wr1 + si1 * wi1;
      qi1 = si1 * wr1 - sr1 * wi1;
      qr3 = sr3 * wr3 + si3 * wi3;
      qi3 = si3 * wr3 - sr3 * wi3;
      qr5 = sr5 * wr5 + si5 * wi5;
      qi5 = si5 * wr5 - sr5 * wi5;
      qr7 = sr7 * wr7 + si7 * wi7;
      qi7 = si7 * wr7 - sr7 * wi7;
      tr0 = qr0 + qr2;
      ti0 = qi0 + qi2;
      tr2 = qr0 - qr2;
      ti2 = qi0 - qi2;
      tr4 = qr4 + qi6;
      ti4 = qi4 - qr6;
      tr6 = qr4 - qi6;
      ti6 = qi4 + qr6;
      tr1 = qr1 + qr3;
      ti1 = qi1 + qi3;
      tr3 = qr1 - qr3;
      ti3 = qi1 - qi3;
      tr5 = qr5 + qr7;
      ti5 = qi5 + qi7;
      tr7 = qr5 - qr7;
      ti7 = qi5 - qi7;
      o0[2 * j] = tr0 + tr1;
      o0[2 * j + 1] = ti0 + ti1;
      o4[2 * j] = tr0 - tr1;
      o4[2 * j + 1] = ti0 - ti1;
      o1[2 * j] = tr4 + tr5;
      o1[2 * j + 1] = ti4 + ti5;
      o5[2 * j] = tr4 - tr5;
      o5[2 * j + 1] = ti4 - ti5;
      o2[2 * j] = tr2 + ti3;
      o2[2 * j + 1] = ti2 - tr3;
      o6[2 * j] = tr2 - ti3;
      o6[2 * j + 1] = ti2 + tr3;
      o3[2 * j] = tr6 + ti7;
      o3[2 * j + 1] = ti6 - tr7;
      o7[2 * j] = tr6 - ti7;
      o7[2 * j + 1] = ti6 + tr7;
    }
    i0 += 16 * bsize;
    i1 += 16 * bsize;
    i2 += 16 * bsize;
    i3 += 16 * bsize;
    i4 += 16 * bsize;
    i5 += 16 * bsize;
    i6 += 16 * bsize;
    i7 += 16 * bsize;
    o0 += 2 * bsize;
    o1 += 2 * bsize;
    o2 += 2 * bsize;
    o3 += 2 * bsize;
    o4 += 2 * bsize;
    o5 += 2 * bsize;
    o6 += 2 * bsize;
    o7 += 2 * bsize;
  }
}
```