user: 这段汇编代码用C语言表示是什么样的:

```asm
<implicit_precalc_2Dy>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x50,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %rcx,-0x40(%rbp)
  movsd  %xmm0,-0x48(%rbp)
  mov    %r8d,-0x4c(%rbp)
  mov    %r9d,-0x50(%rbp)
  mov    -0x50(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x10(%rbp)
  mov    -0x50(%rbp),%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x8(%rbp)
  mov    -0x50(%rbp),%eax
  mov    %eax,%edi
  call   <tridiag_malloc@plt>
  mov    0x10(%rbp),%eax
  mov    %eax,-0x18(%rbp)
  jmp    L28
L3:
  movl   $0x0,-0x14(%rbp)
  jmp    L16
L39:
  mov    -0x18(%rbp),%eax
  imul   -0x50(%rbp),%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  movsd  D12(%rip),%xmm0
  divsd  -0x48(%rbp),%xmm0
  mov    -0x14(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  movsd  D12(%rip),%xmm0
  movapd %xmm0,%xmm1
  divsd  -0x48(%rbp),%xmm1
  mov    -0x18(%rbp),%eax
  imul   -0x50(%rbp),%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x14(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  mulsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  addl   $0x1,-0x14(%rbp)
L16:
  mov    -0x14(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L39
  mov    -0x18(%rbp),%eax
  imul   -0x50(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  lea    (%rdx,%rax,1),%r8
  mov    -0x18(%rbp),%eax
  imul   -0x50(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x40(%rbp),%rax
  lea    (%rdx,%rax,1),%rsi
  mov    -0x18(%rbp),%eax
  imul   -0x50(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x30(%rbp),%rax
  lea    (%rdx,%rax,1),%rdi
  mov    -0x50(%rbp),%ecx
  mov    -0x8(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  mov    %ecx,%r9d
  mov    %rdx,%rcx
  mov    %rsi,%rdx
  mov    %rax,%rsi
  call   <tridiag_premalloc@plt>
  addl   $0x1,-0x18(%rbp)
L28:
  mov    -0x18(%rbp),%eax
  cmp    0x18(%rbp),%eax
  jl     L3
  mov    $0x0,%eax
  call   <tridiag_free@plt>
  mov    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x8(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  nop
  leave
  ret
```

tool_calls: name: extract_symbolic_data
arguments: label: D12
data_type: byte[8]

tool: {"D12": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f]}

assistant: ```c
void implicit_precalc_2Dy(double *phi, double *ay, double *by, double *cy, double dt, int L, int M, int Lstart, int Lend) {
  int ii, jj;
  double *b = malloc(M * sizeof(*b));
  double *r = malloc(M * sizeof(*r));
  tridiag_malloc(M);
  for (ii = Lstart; ii < Lend; ii++) {
    for (jj = 0; jj < M; jj++) {
      b[jj] = by[ii * M + jj] + 1 / dt;
      r[jj] = 1 / dt * phi[ii * M + jj];
    }
    tridiag_premalloc(&ay[ii * M], b, &cy[ii * M], r, &phi[ii * M], M);
  }
  tridiag_free();
  free(b);
  free(r);
}
```