user: 请从给定的汇编指令推导出C源代码：

```asm
<matvec_sub>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x8(%rbp)
  mov    %rsi,-0x10(%rbp)
  mov    %rdx,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  movsd  (%rax),%xmm0
  mov    -0x8(%rbp),%rax
  movsd  (%rax),%xmm2
  mov    -0x10(%rbp),%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x28,%rax
  movsd  (%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x50,%rax
  movsd  (%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x78,%rax
  movsd  (%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0xa0,%rax
  movsd  (%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x20,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x18(%rbp),%rax
  movsd  %xmm0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  mov    -0x8(%rbp),%rax
  movsd  0x8(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x28,%rax
  movsd  0x8(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x50,%rax
  movsd  0x8(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x78,%rax
  movsd  0x8(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0xa0,%rax
  movsd  0x8(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x20,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  mov    -0x18(%rbp),%rax
  add    $0x8,%rax
  subsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm0
  mov    -0x8(%rbp),%rax
  movsd  0x10(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x28,%rax
  movsd  0x10(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x50,%rax
  movsd  0x10(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x78,%rax
  movsd  0x10(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0xa0,%rax
  movsd  0x10(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x20,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  mov    -0x18(%rbp),%rax
  add    $0x10,%rax
  subsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm0
  mov    -0x8(%rbp),%rax
  movsd  0x18(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x28,%rax
  movsd  0x18(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x50,%rax
  movsd  0x18(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x78,%rax
  movsd  0x18(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0xa0,%rax
  movsd  0x18(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x20,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  mov    -0x18(%rbp),%rax
  add    $0x18,%rax
  subsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x18(%rbp),%rax
  add    $0x20,%rax
  movsd  (%rax),%xmm0
  mov    -0x8(%rbp),%rax
  movsd  0x20(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x28,%rax
  movsd  0x20(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x50,%rax
  movsd  0x20(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x10,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x78,%rax
  movsd  0x20(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0xa0,%rax
  movsd  0x20(%rax),%xmm2
  mov    -0x10(%rbp),%rax
  add    $0x20,%rax
  movsd  (%rax),%xmm1
  mulsd  %xmm2,%xmm1
  mov    -0x18(%rbp),%rax
  add    $0x20,%rax
  subsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  nop
  pop    %rbp
  ret
```

assistant: ```c
void matvec_sub(double ablock[5][5], double avec[5], double bvec[5]) {
  bvec[0] = bvec[0] - ablock[0][0] * avec[0] - ablock[1][0] * avec[1] - ablock[2][0] * avec[2] - ablock[3][0] * avec[3] - ablock[4][0] * avec[4];
  bvec[1] = bvec[1] - ablock[0][1] * avec[0] - ablock[1][1] * avec[1] - ablock[2][1] * avec[2] - ablock[3][1] * avec[3] - ablock[4][1] * avec[4];
  bvec[2] = bvec[2] - ablock[0][2] * avec[0] - ablock[1][2] * avec[1] - ablock[2][2] * avec[2] - ablock[3][2] * avec[3] - ablock[4][2] * avec[4];
  bvec[3] = bvec[3] - ablock[0][3] * avec[0] - ablock[1][3] * avec[1] - ablock[2][3] * avec[2] - ablock[3][3] * avec[3] - ablock[4][3] * avec[4];
  bvec[4] = bvec[4] - ablock[0][4] * avec[0] - ablock[1][4] * avec[1] - ablock[2][4] * avec[2] - ablock[3][4] * avec[3] - ablock[4][4] * avec[4];
}
```