user: 请将以下的汇编代码转换成C语言代码：

```asm
<mp_mul_rcsqu_save>:
  endbr64
  lea    0x0(,%rcx,4),%eax
  push   %rbx
  movslq %edi,%rbx
  mov    %rdx,%rdi
  mov    %ebx,%r10d
  cltd
  idiv   %ebx
  sar    %r10d
  cmp    $0x5,%ebx
  jle    L4
  mov    %eax,%r11d
  movslq %ecx,%rcx
  cltq
  movsd  D1(%rip),%xmm5
  neg    %r11d
  sub    %rax,%rcx
  lea    0x0(,%rax,8),%r9
  mov    $0x2,%eax
  movslq %r11d,%r11
  lea    (%r8,%rcx,8),%rcx
  lea    -0x10(,%rbx,8),%rdx
  add    %r9,%r8
  shl    $0x3,%r11
  nopl   (%rax)
L2:
  movsd  (%rsi,%rax,8),%xmm1
  movsd  0x8(%rsi,%rax,8),%xmm3
  movapd %xmm5,%xmm2
  movsd  (%rsi,%rdx,1),%xmm0
  movsd  0x8(%rsi,%rdx,1),%xmm7
  subsd  (%rcx),%xmm2
  movapd %xmm1,%xmm9
  movapd %xmm3,%xmm4
  add    %r11,%rcx
  movsd  (%r8),%xmm6
  subsd  %xmm0,%xmm9
  addsd  %xmm7,%xmm4
  add    %r9,%r8
  movapd %xmm2,%xmm8
  movapd %xmm6,%xmm10
  mulsd  %xmm4,%xmm10
  mulsd  %xmm9,%xmm8
  mulsd  %xmm2,%xmm4
  mulsd  %xmm6,%xmm9
  subsd  %xmm10,%xmm8
  movapd %xmm6,%xmm10
  addsd  %xmm9,%xmm4
  subsd  %xmm8,%xmm1
  addsd  %xmm8,%xmm0
  subsd  %xmm4,%xmm3
  subsd  %xmm4,%xmm7
  movapd %xmm1,%xmm4
  movsd  %xmm1,(%rsi,%rax,8)
  mulsd  %xmm1,%xmm4
  addsd  %xmm1,%xmm1
  movapd %xmm3,%xmm8
  movsd  %xmm3,0x8(%rsi,%rax,8)
  mulsd  %xmm3,%xmm8
  movsd  %xmm0,(%rsi,%rdx,1)
  mulsd  %xmm3,%xmm1
  movapd %xmm7,%xmm3
  movsd  %xmm7,0x8(%rsi,%rdx,1)
  mulsd  %xmm7,%xmm3
  subsd  %xmm8,%xmm4
  movapd %xmm0,%xmm8
  mulsd  %xmm0,%xmm8
  addsd  %xmm0,%xmm0
  movapd %xmm1,%xmm9
  mulsd  %xmm7,%xmm0
  movapd %xmm2,%xmm7
  subsd  %xmm3,%xmm8
  movapd %xmm4,%xmm3
  addsd  %xmm0,%xmm9
  subsd  %xmm8,%xmm3
  mulsd  %xmm9,%xmm10
  mulsd  %xmm3,%xmm7
  mulsd  %xmm9,%xmm2
  mulsd  %xmm6,%xmm3
  addsd  %xmm10,%xmm7
  subsd  %xmm3,%xmm2
  subsd  %xmm7,%xmm4
  addsd  %xmm8,%xmm7
  subsd  %xmm2,%xmm1
  subsd  %xmm2,%xmm0
  movsd  %xmm4,(%rdi,%rax,8)
  movsd  %xmm1,0x8(%rdi,%rax,8)
  add    $0x2,%rax
  movsd  %xmm7,(%rdi,%rdx,1)
  movsd  %xmm0,0x8(%rdi,%rdx,1)
  sub    $0x10,%rdx
  cmp    %eax,%r10d
  jg     L2
L4:
  movslq %r10d,%r10
  pop    %rbx
  movsd  (%rsi,%r10,8),%xmm0
  movsd  0x8(%rsi,%r10,8),%xmm2
  movapd %xmm0,%xmm1
  movapd %xmm2,%xmm3
  mulsd  %xmm0,%xmm1
  addsd  %xmm0,%xmm0
  mulsd  %xmm2,%xmm3
  mulsd  %xmm2,%xmm0
  subsd  %xmm3,%xmm1
  unpcklpd %xmm0,%xmm1
  movups %xmm1,(%rdi,%r10,8)
  ret
```

tool_calls: name: unpack_data
arguments: label: D1
type_infered: f64

tool: D1: 0.5

assistant: ```c
void mp_mul_rcsqu_save(int n, double *a, double *b, int nc, double *c) {
  int j, k, kk, ks, m;
  double wkr, wki, xr, xi, yr, yi, ajr, aji, akr, aki;
  ks = (nc << 2) / n;
  kk = 0;
  m = n >> 1;
  for (j = 2; j < m; j += 2) {
    k = n - j;
    kk += ks;
    wkr = ((double)0.5) - c[nc - kk];
    wki = c[kk];
    xr = a[j] - a[k];
    xi = a[j + 1] + a[k + 1];
    yr = wkr * xr - wki * xi;
    yi = wkr * xi + wki * xr;
    xr = a[j] - yr;
    xi = a[j + 1] - yi;
    yr = a[k] + yr;
    yi = a[k + 1] - yi;
    a[j] = xr;
    a[j + 1] = xi;
    a[k] = yr;
    a[k + 1] = yi;
    ajr = xr * xr - xi * xi;
    aji = 2 * xr * xi;
    akr = yr * yr - yi * yi;
    aki = 2 * yr * yi;
    xr = ajr - akr;
    xi = aji + aki;
    yr = wkr * xr + wki * xi;
    yi = wkr * xi - wki * xr;
    b[j] = ajr - yr;
    b[j + 1] = aji - yi;
    b[k] = akr + yr;
    b[k + 1] = aki - yi;
  }
  xr = a[m];
  xi = a[m + 1];
  b[m] = xr * xr - xi * xi;
  b[m + 1] = 2 * xr * xi;
}
```