user: 请将以下的汇编代码转换成C语言代码:

```asm
<fsub>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x88,%rsp
  mov    %rdi,0x78(%rsp)
  mov    %esi,%r15d
  mov    %esi,0x58(%rsp)
  mov    %edx,0x5c(%rsp)
  mov    %rcx,%rbx
  mov    %r8,%rbp
  movslq %esi,%r12
  lea    0x0(,%rsi,8),%r13d
  mov    %r13d,%edi
  call   <malloc@plt>
  mov    %rax,%r14
  mov    %rax,0x10(%rsp)
  mov    %r13d,%edi
  call   <malloc@plt>
  mov    %rax,0x40(%rsp)
  cmpl   $0x0,0x5c(%rsp)
  jle    L8
  mov    %rax,%rdx
  lea    0x0(,%r12,8),%rdi
  mov    %rdi,0x20(%rsp)
  mov    %r14,%rcx
  neg    %r14
  mov    %r14,0x70(%rsp)
  sub    %rcx,%rbp
  mov    %rbp,0x48(%rsp)
  sub    %rax,%rbx
  mov    %rbx,0x50(%rsp)
  lea    -0x1(%r15),%eax
  mov    %rax,0x30(%rsp)
  lea    0x8(,%rax,8),%rax
  add    %rax,%rdx
  mov    %rdx,0x68(%rsp)
  lea    0x8(%rdi),%rdx
  mov    %rdx,0x28(%rsp)
  add    %rcx,%rax
  mov    %rax,0x60(%rsp)
  movl   $0x0,0x3c(%rsp)
  lea    D7(%rip),%r15
  jmp    L48
L62:
  mov    %rax,%r13
L112:
  test   %r13d,%r13d
  jle    L100
  lea    -0x1(%r13),%eax
  mov    0x10(%rsp),%rbx
  lea    0x8(%rbx,%rax,8),%r12
  pxor   %xmm3,%xmm3
  movsd  %xmm3,0x8(%rsp)
L22:
  movsd  0x0(%rbp,%rbx,1),%xmm0
  mulsd  (%rbx),%xmm0
  addsd  0x8(%rsp),%xmm0
  movsd  %xmm0,0x8(%rsp)
  mov    %r15,%rdi
  call   <printf@plt>
  add    $0x8,%rbx
  cmp    %r12,%rbx
  jne    L22
L84:
  movsd  (%r14),%xmm0
  subsd  0x8(%rsp),%xmm0
  mov    0x18(%rsp),%rsi
  divsd  (%rsi),%xmm0
  mov    0x10(%rsp),%rax
  movsd  %xmm0,(%rax,%r13,8)
  lea    0x1(%r13),%rax
  add    $0x8,%r14
  mov    0x28(%rsp),%rcx
  add    %rcx,%rsi
  mov    %rsi,0x18(%rsp)
  add    0x20(%rsp),%rbp
  cmp    0x30(%rsp),%r13
  jne    L62
  mov    0x10(%rsp),%rax
  mov    0x60(%rsp),%rdx
  mov    0x48(%rsp),%rcx
L3:
  movsd  (%rax),%xmm0
  movsd  %xmm0,(%rcx,%rax,1)
  add    $0x8,%rax
  cmp    %rdx,%rax
  jne    L3
L80:
  addl   $0x1,0x3c(%rsp)
  mov    0x3c(%rsp),%eax
  mov    0x20(%rsp),%rdx
  add    %rdx,0x48(%rsp)
  add    %rdx,0x50(%rsp)
  cmp    %eax,0x5c(%rsp)
  je     L8
L48:
  cmpl   $0x0,0x58(%rsp)
  jle    L82
  mov    0x40(%rsp),%rcx
  mov    %rcx,%rax
  mov    0x10(%rsp),%rdx
  sub    %rcx,%rdx
  mov    0x68(%rsp),%rcx
  mov    0x50(%rsp),%rsi
L88:
  movsd  (%rsi,%rax,1),%xmm0
  movsd  %xmm0,(%rax)
  movq   $0x0,(%rdx,%rax,1)
  add    $0x8,%rax
  cmp    %rcx,%rax
  jne    L88
  mov    $0x1,%edx
  mov    0x58(%rsp),%esi
  mov    0x40(%rsp),%r14
  mov    %r14,%rdi
  call   <mdisplay@plt>
  mov    0x78(%rsp),%rax
  mov    %rax,0x18(%rsp)
  add    0x70(%rsp),%rax
  mov    %rax,%rbp
  mov    $0x0,%r13d
  jmp    L112
L100:
  pxor   %xmm4,%xmm4
  movsd  %xmm4,0x8(%rsp)
  jmp    L84
L8:
  mov    0x10(%rsp),%rdi
  call   <free@plt>
  mov    0x40(%rsp),%rdi
  call   <free@plt>
  add    $0x88,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L82:
  mov    $0x1,%edx
  mov    0x58(%rsp),%esi
  mov    0x40(%rsp),%rdi
  call   <mdisplay@plt>
  jmp    L80
```

tool_calls: name: unpack_data
arguments: data_tag: D7
type_guessed: string

tool: D7: sum %lf 


assistant: ```c
void fsub(double *A, int N, int M, double *bb, double *xx) {
  int i, j, t, k, u;
  double sum;
  double *x, *b;
  x = (double *)malloc(sizeof(double) * N);
  b = (double *)malloc(sizeof(double) * N);
  for (k = 0; k < M; ++k) {
    u = k * N;
    for (i = 0; i < N; ++i) {
      b[i] = bb[u + i];
      x[i] = 0.;
    }
    mdisplay(b, N, 1);
    for (i = 0; i < N; ++i) {
      t = i * N;
      sum = 0;
      for (j = 0; j < i; ++j) {
        sum += A[t + j] * x[j];
        printf("sum %lf \n", sum);
      }
      x[i] = (b[i] - sum) / A[t + i];
    }
    for (i = 0; i < N; ++i) {
      xx[u + i] = x[i];
    }
  }
  free(x);
  free(b);
}
```