user: 请从给定的汇编指令推导出C源代码:

```asm
<vm>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    %ecx,-0x2c(%rbp)
  movl   $0x1,-0x4(%rbp)
  jmp    L3
L20:
  cmpl   $0x1,-0x4(%rbp)
  jg     L78
  mov    -0x28(%rbp),%rax
  add    $0x8,%rax
  pxor   %xmm0,%xmm0
  movss  %xmm0,(%rax)
  mov    -0x20(%rbp),%rax
  add    $0x8,%rax
  movss  (%rax),%xmm0
  mov    -0x28(%rbp),%rax
  add    $0x8,%rax
  movss  (%rax),%xmm1
  mov    -0x20(%rbp),%rax
  add    $0x8,%rax
  subss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  movl   $0x3,-0x8(%rbp)
  jmp    L26
L50:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  pxor   %xmm0,%xmm0
  movss  %xmm0,(%rax)
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm1
  mov    -0x4(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm2
  mov    -0x4(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x8(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  %xmm2,%xmm0
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  addss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x8(%rbp)
L26:
  mov    -0x2c(%rbp),%eax
  cmp    -0x8(%rbp),%eax
  jg     L50
  jmp    L79
L78:
  mov    -0x4(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mov    -0x4(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm1
  mov    -0x4(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  subss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  mov    -0x4(%rbp),%eax
  add    $0x2,%eax
  mov    %eax,-0x8(%rbp)
  jmp    L42
L56:
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm1
  mov    -0x4(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movss  (%rax),%xmm2
  mov    -0x4(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%rdx
  mov    -0x8(%rbp),%eax
  cltq
  shl    $0x2,%rax
  add    %rdx,%rax
  movss  (%rax),%xmm0
  mulss  %xmm2,%xmm0
  mov    -0x8(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  addss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  addl   $0x1,-0x8(%rbp)
L42:
  mov    -0x2c(%rbp),%eax
  cmp    -0x8(%rbp),%eax
  jg     L56
L79:
  addl   $0x1,-0x4(%rbp)
L3:
  mov    -0x2c(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x4(%rbp)
  jl     L20
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void vm(float **a, float *b, float *s, int n) {
  int t4;
  int t2;
  int i;
  int j;
  for (t2 = 1; t2 <= n - 2; t2 += 1)
    if (t2 <= 1) {
      s[2] = 0.0f;
      b[2] = (b[2] - s[2]);
      for (t4 = 3; t4 <= n - 1; t4 += 1) {
        s[t4] = 0.0f;
        s[t4] = (s[t4] + (b[t2] * a[t2][t4]));
      }
    } else {
      b[t2 + 1] = (b[t2 + 1] - s[t2 + 1]);
      for (t4 = t2 + 2; t4 <= n - 1; t4 += 1)
        s[t4] = (s[t4] + (b[t2] * a[t2][t4]));
    }
}
```