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

```asm
<project_v>:
  endbr64
  movslq %esi,%rax
  movslq %edx,%rsi
  lea    (%rax,%rdi,2),%edx
  lea    (%rdx,%rdx,2),%r11d
  lea    (%r11,%rdi,1),%edx
  lea    (%rax,%rdx,2),%edx
  add    %edx,%edx
  movslq %edx,%rdx
  movsd  (%r8,%rdx,8),%xmm0
  movsd  0x8(%r8,%rdx,8),%xmm3
  lea    (%rcx,%rsi,2),%edx
  movslq %ecx,%rcx
  lea    (%rdx,%rdx,2),%r10d
  lea    (%r10,%rdi,1),%edx
  movslq %edi,%rdi
  lea    (%rax,%rdx,2),%edx
  lea    (%rax,%rdi,2),%rax
  add    %edx,%edx
  movslq %edx,%rdx
  movsd  (%r8,%rdx,8),%xmm2
  movsd  0x8(%r8,%rdx,8),%xmm1
  lea    (%rax,%rax,2),%rdx
  lea    (%rcx,%rsi,2),%rax
  lea    (%rax,%rax,2),%rax
  shl    $0x5,%rdx
  shl    $0x5,%rax
  lea    0x20(%rax),%rcx
  cmp    %rcx,%rdx
  jge    L11
  lea    0x20(%rdx),%rcx
  cmp    %rcx,%rax
  jl     L13
L11:
  unpcklpd %xmm0,%xmm0
  unpcklpd %xmm3,%xmm3
  unpcklpd %xmm2,%xmm2
  add    %r9,%rax
  movupd (%rax),%xmm5
  movupd (%rax),%xmm9
  add    %rdx,%r9
  unpcklpd %xmm1,%xmm1
  movupd 0x10(%rax),%xmm4
  movupd 0x10(%rax),%xmm6
  mulpd  %xmm0,%xmm5
  movupd (%r9),%xmm8
  movupd 0x10(%r9),%xmm7
  mulpd  %xmm3,%xmm9
  mulpd  %xmm0,%xmm4
  mulpd  %xmm3,%xmm6
  mulpd  %xmm1,%xmm8
  mulpd  %xmm1,%xmm7
  movapd %xmm5,%xmm10
  shufpd $0x1,%xmm9,%xmm9
  subpd  %xmm9,%xmm10
  addpd  %xmm9,%xmm5
  movupd (%r9),%xmm9
  mulpd  %xmm2,%xmm9
  shufpd $0x1,%xmm6,%xmm6
  movsd  %xmm10,%xmm5
  shufpd $0x1,%xmm8,%xmm8
  shufpd $0x1,%xmm7,%xmm7
  subpd  %xmm9,%xmm5
  movapd %xmm4,%xmm9
  addpd  %xmm6,%xmm4
  subpd  %xmm6,%xmm9
  movupd 0x10(%r9),%xmm6
  mulpd  %xmm2,%xmm6
  movsd  %xmm9,%xmm4
  movupd 0x20(%rax),%xmm9
  mulpd  %xmm3,%xmm9
  subpd  %xmm6,%xmm4
  movapd %xmm8,%xmm6
  addpd  %xmm5,%xmm6
  subpd  %xmm8,%xmm5
  shufpd $0x1,%xmm9,%xmm9
  movsd  %xmm6,%xmm5
  movupd 0x30(%rax),%xmm6
  movups %xmm5,(%rax)
  movapd %xmm7,%xmm5
  addpd  %xmm4,%xmm5
  subpd  %xmm7,%xmm4
  mulpd  %xmm3,%xmm6
  movsd  %xmm5,%xmm4
  movupd 0x20(%rax),%xmm5
  movups %xmm4,0x10(%rax)
  movupd 0x30(%rax),%xmm4
  movupd 0x20(%r9),%xmm8
  mulpd  %xmm0,%xmm5
  shufpd $0x1,%xmm6,%xmm6
  movupd 0x30(%r9),%xmm7
  mulpd  %xmm0,%xmm4
  mulpd  %xmm1,%xmm8
  mulpd  %xmm1,%xmm7
  movapd %xmm5,%xmm10
  addpd  %xmm9,%xmm5
  subpd  %xmm9,%xmm10
  movupd 0x20(%r9),%xmm9
  shufpd $0x1,%xmm8,%xmm8
  mulpd  %xmm2,%xmm9
  shufpd $0x1,%xmm7,%xmm7
  movsd  %xmm10,%xmm5
  subpd  %xmm9,%xmm5
  movapd %xmm4,%xmm9
  addpd  %xmm6,%xmm4
  subpd  %xmm6,%xmm9
  movupd 0x30(%r9),%xmm6
  mulpd  %xmm2,%xmm6
  movsd  %xmm9,%xmm4
  movupd 0x40(%rax),%xmm9
  mulpd  %xmm3,%xmm9
  subpd  %xmm6,%xmm4
  movapd %xmm8,%xmm6
  addpd  %xmm5,%xmm6
  subpd  %xmm8,%xmm5
  movsd  %xmm6,%xmm5
  movupd 0x50(%rax),%xmm6
  movups %xmm5,0x20(%rax)
  movapd %xmm7,%xmm5
  addpd  %xmm4,%xmm5
  subpd  %xmm7,%xmm4
  movsd  %xmm5,%xmm4
  movups %xmm4,0x30(%rax)
  movupd 0x40(%rax),%xmm4
  movupd 0x40(%r9),%xmm8
  movupd 0x50(%r9),%xmm7
  mulpd  %xmm0,%xmm4
  movapd %xmm8,%xmm5
  mulpd  %xmm6,%xmm0
  mulpd  %xmm3,%xmm6
  movapd %xmm9,%xmm3
  shufpd $0x1,%xmm9,%xmm3
  mulpd  %xmm2,%xmm8
  mulpd  %xmm7,%xmm2
  mulpd  %xmm1,%xmm5
  movapd %xmm4,%xmm9
  addpd  %xmm3,%xmm4
  subpd  %xmm3,%xmm9
  mulpd  %xmm7,%xmm1
  shufpd $0x1,%xmm6,%xmm6
  movapd %xmm4,%xmm3
  movapd %xmm0,%xmm4
  addpd  %xmm6,%xmm0
  subpd  %xmm6,%xmm4
  movsd  %xmm9,%xmm3
  subpd  %xmm8,%xmm3
  shufpd $0x1,%xmm5,%xmm5
  shufpd $0x1,%xmm1,%xmm1
  movsd  %xmm4,%xmm0
  subpd  %xmm2,%xmm0
  movapd %xmm3,%xmm2
  subpd  %xmm5,%xmm3
  addpd  %xmm5,%xmm2
  movsd  %xmm2,%xmm3
  movapd %xmm0,%xmm2
  subpd  %xmm1,%xmm0
  addpd  %xmm1,%xmm2
  movups %xmm3,0x40(%rax)
  movsd  %xmm2,%xmm0
  movups %xmm0,0x50(%rax)
  ret
  nopl   (%rax)
L13:
  lea    0x0(,%r11,4),%eax
  movapd %xmm0,%xmm5
  movapd %xmm3,%xmm9
  cltq
  movsd  (%r9,%rax,8),%xmm6
  movsd  0x8(%r9,%rax,8),%xmm7
  lea    0x0(,%r10,4),%eax
  cltq
  lea    (%r9,%rax,8),%rdx
  lea    0x8(%r9,%rax,8),%rax
  movsd  (%rdx),%xmm8
  movsd  (%rax),%xmm4
  mulsd  %xmm8,%xmm5
  mulsd  %xmm4,%xmm9
  mulsd  %xmm3,%xmm8
  mulsd  %xmm0,%xmm4
  subsd  %xmm9,%xmm5
  movapd %xmm2,%xmm9
  mulsd  %xmm6,%xmm9
  addsd  %xmm8,%xmm4
  mulsd  %xmm1,%xmm6
  subsd  %xmm9,%xmm5
  movapd %xmm1,%xmm9
  mulsd  %xmm7,%xmm9
  mulsd  %xmm2,%xmm7
  addsd  %xmm9,%xmm5
  movapd %xmm3,%xmm9
  subsd  %xmm7,%xmm4
  movsd  %xmm5,(%rdx)
  movapd %xmm0,%xmm5
  subsd  %xmm6,%xmm4
  movsd  %xmm4,(%rax)
  lea    0x2(,%r11,4),%eax
  add    $0x1,%r11d
  cltq
  movsd  (%r9,%rax,8),%xmm6
  movsd  0x8(%r9,%rax,8),%xmm7
  lea    0x2(,%r10,4),%eax
  add    $0x1,%r10d
  cltq
  lea    (%r9,%rax,8),%rdx
  lea    0x8(%r9,%rax,8),%rax
  movsd  (%rdx),%xmm4
  movsd  (%rax),%xmm8
  mulsd  %xmm4,%xmm5
  mulsd  %xmm8,%xmm9
  mulsd  %xmm3,%xmm4
  mulsd  %xmm0,%xmm8
  subsd  %xmm9,%xmm5
  movapd %xmm2,%xmm9
  mulsd  %xmm6,%xmm9
  addsd  %xmm8,%xmm4
  mulsd  %xmm1,%xmm6
  subsd  %xmm9,%xmm5
  movapd %xmm1,%xmm9
  mulsd  %xmm7,%xmm9
  mulsd  %xmm2,%xmm7
  addsd  %xmm9,%xmm5
  movapd %xmm3,%xmm9
  subsd  %xmm7,%xmm4
  movsd  %xmm5,(%rdx)
  lea    0x0(,%r10,4),%edx
  movapd %xmm0,%xmm5
  movslq %edx,%rdx
  subsd  %xmm6,%xmm4
  lea    0x0(,%rdx,8),%rcx
  lea    0x8(%r9,%rdx,8),%rsi
  lea    (%r9,%rcx,1),%rdi
  lea    0x20(%r9,%rcx,1),%rcx
  movsd  %xmm4,(%rax)
  movsd  (%rdi),%xmm8
  movsd  (%rsi),%xmm4
  lea    0x0(,%r11,4),%eax
  cltq
  mulsd  %xmm4,%xmm9
  movsd  (%r9,%rax,8),%xmm6
  movsd  0x8(%r9,%rax,8),%xmm7
  mulsd  %xmm8,%xmm5
  mulsd  %xmm0,%xmm4
  mulsd  %xmm3,%xmm8
  subsd  %xmm9,%xmm5
  movapd %xmm2,%xmm9
  mulsd  %xmm6,%xmm9
  addsd  %xmm8,%xmm4
  mulsd  %xmm1,%xmm6
  subsd  %xmm9,%xmm5
  movapd %xmm1,%xmm9
  mulsd  %xmm7,%xmm9
  mulsd  %xmm2,%xmm7
  addsd  %xmm9,%xmm5
  movapd %xmm3,%xmm9
  subsd  %xmm7,%xmm4
  movsd  %xmm5,(%rdi)
  movapd %xmm0,%xmm5
  subsd  %xmm6,%xmm4
  movsd  %xmm4,(%rsi)
  lea    0x2(,%r11,4),%esi
  movslq %esi,%rsi
  movsd  (%r9,%rsi,8),%xmm6
  movsd  0x8(%r9,%rsi,8),%xmm7
  lea    0x2(,%r10,4),%esi
  movslq %esi,%rsi
  lea    (%r9,%rsi,8),%rdi
  lea    0x8(%r9,%rsi,8),%rsi
  movsd  (%rdi),%xmm8
  movsd  (%rsi),%xmm4
  mulsd  %xmm8,%xmm5
  mulsd  %xmm4,%xmm9
  mulsd  %xmm3,%xmm8
  mulsd  %xmm0,%xmm4
  subsd  %xmm9,%xmm5
  movapd %xmm2,%xmm9
  mulsd  %xmm6,%xmm9
  addsd  %xmm8,%xmm4
  mulsd  %xmm1,%xmm6
  subsd  %xmm9,%xmm5
  movapd %xmm1,%xmm9
  mulsd  %xmm7,%xmm9
  mulsd  %xmm2,%xmm7
  addsd  %xmm9,%xmm5
  movapd %xmm3,%xmm9
  subsd  %xmm7,%xmm4
  movsd  %xmm5,(%rdi)
  movapd %xmm0,%xmm5
  subsd  %xmm6,%xmm4
  movsd  %xmm4,(%rsi)
  movsd  0x20(%r9,%rax,8),%xmm6
  movsd  0x28(%r9,%rax,8),%xmm7
  lea    0x28(%r9,%rdx,8),%rax
  movsd  (%rax),%xmm8
  movsd  (%rcx),%xmm4
  mulsd  %xmm8,%xmm9
  mulsd  %xmm4,%xmm5
  mulsd  %xmm0,%xmm8
  mulsd  %xmm3,%xmm4
  subsd  %xmm9,%xmm5
  movapd %xmm2,%xmm9
  mulsd  %xmm6,%xmm9
  addsd  %xmm8,%xmm4
  mulsd  %xmm1,%xmm6
  subsd  %xmm9,%xmm5
  movapd %xmm1,%xmm9
  mulsd  %xmm7,%xmm9
  mulsd  %xmm2,%xmm7
  addsd  %xmm9,%xmm5
  subsd  %xmm7,%xmm4
  movsd  %xmm5,(%rcx)
  subsd  %xmm6,%xmm4
  movsd  %xmm4,(%rax)
  lea    0x6(,%r11,4),%eax
  cltq
  movsd  (%r9,%rax,8),%xmm6
  movsd  0x8(%r9,%rax,8),%xmm7
  lea    0x6(,%r10,4),%eax
  cltq
  lea    (%r9,%rax,8),%rdx
  lea    0x8(%r9,%rax,8),%rax
  movsd  (%rdx),%xmm4
  movsd  (%rax),%xmm8
  movapd %xmm4,%xmm5
  movapd %xmm8,%xmm9
  mulsd  %xmm3,%xmm9
  mulsd  %xmm0,%xmm5
  mulsd  %xmm3,%xmm4
  mulsd  %xmm0,%xmm8
  subsd  %xmm9,%xmm5
  movapd %xmm6,%xmm9
  mulsd  %xmm2,%xmm9
  addsd  %xmm8,%xmm4
  mulsd  %xmm1,%xmm6
  subsd  %xmm9,%xmm5
  movapd %xmm7,%xmm9
  mulsd  %xmm2,%xmm7
  mulsd  %xmm1,%xmm9
  subsd  %xmm7,%xmm4
  addsd  %xmm9,%xmm5
  subsd  %xmm6,%xmm4
  movsd  %xmm5,(%rdx)
  movsd  %xmm4,(%rax)
  ret
```

assistant: ```c
void project_v(int a, int i, int b, int j, double r[], double v[]) {
  int c, k;
  double xi, yi, xj, yj;
  xi = (&((r)[2 * ((i) + 2 * ((a) + 3 * ((i) + 2 * (a))))]))[0];
  yi = (&((r)[2 * ((i) + 2 * ((a) + 3 * ((i) + 2 * (a))))]))[1];
  xj = (&((r)[2 * ((i) + 2 * ((a) + 3 * ((j) + 2 * (b))))]))[0];
  yj = (&((r)[2 * ((i) + 2 * ((a) + 3 * ((j) + 2 * (b))))]))[1];
  for (c = 0; c < 3; c++)
    for (k = 0; k < 2; k++) {
      double zi = (&((v)[2 * ((k) + 2 * ((c) + 3 * ((i) + 2 * (a))))]))[0];
      double ti = (&((v)[2 * ((k) + 2 * ((c) + 3 * ((i) + 2 * (a))))]))[1];
      double zj = (&((v)[2 * ((k) + 2 * ((c) + 3 * ((j) + 2 * (b))))]))[0];
      double tj = (&((v)[2 * ((k) + 2 * ((c) + 3 * ((j) + 2 * (b))))]))[1];
      (&((v)[2 * ((k) + 2 * ((c) + 3 * ((j) + 2 * (b))))]))[0] = xi * zj - yi * tj - xj * zi + yj * ti;
      (&((v)[2 * ((k) + 2 * ((c) + 3 * ((j) + 2 * (b))))]))[1] = xi * tj + yi * zj - xj * ti - yj * zi;
    }
}
```