user: Converte this assembly snippet into its equivalent C code:

```asm
<kernel_dtrsm_nn_ll_diag_2x2_vs_lib4>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %edi,-0x54(%rbp)
  mov    %esi,-0x58(%rbp)
  mov    %edx,-0x5c(%rbp)
  mov    %rcx,-0x68(%rbp)
  mov    %r8,-0x70(%rbp)
  mov    %r9d,-0x60(%rbp)
  movl   $0x4,-0x4c(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  cmpl   $0x0,-0x5c(%rbp)
  jle    L22
  movl   $0x0,-0x50(%rbp)
  jmp    L59
L105:
  mov    -0x68(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    -0x68(%rbp),%rax
  movsd  0x8(%rax),%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x70(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x18(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x70(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x48(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x38(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x40(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x30(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    -0x4c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x70(%rbp),%rax
  movsd  0x8(%rax),%xmm0
  movsd  %xmm0,-0x18(%rbp)
  mov    -0x4c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x70(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x48(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x38(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x40(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x30(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  mov    -0x4c(%rbp),%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    -0x4c(%rbp),%eax
  add    %eax,%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x70(%rbp),%rax
  movsd  0x10(%rax),%xmm0
  movsd  %xmm0,-0x18(%rbp)
  mov    -0x4c(%rbp),%eax
  add    $0x2,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x70(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x48(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x38(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x40(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x30(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  mov    -0x4c(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    -0x4c(%rbp),%edx
  mov    %edx,%eax
  add    %eax,%eax
  add    %edx,%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x70(%rbp),%rax
  movsd  0x18(%rax),%xmm0
  movsd  %xmm0,-0x18(%rbp)
  mov    -0x4c(%rbp),%eax
  add    $0x3,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x70(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x48(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x38(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x40(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x30(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  subq   $0xffffffffffffff80,-0x68(%rbp)
  mov    -0x60(%rbp),%eax
  shl    $0x2,%eax
  cltq
  shl    $0x3,%rax
  add    %rax,-0x70(%rbp)
  addl   $0x4,-0x50(%rbp)
L59:
  mov    -0x5c(%rbp),%eax
  sub    $0x3,%eax
  cmp    %eax,-0x50(%rbp)
  jl     L105
  jmp    L7
L109:
  mov    -0x68(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    -0x68(%rbp),%rax
  movsd  0x8(%rax),%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x70(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x18(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x70(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x48(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x18(%rbp),%xmm1
  movsd  -0x38(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x28(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x40(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  movsd  -0x20(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x10(%rbp),%xmm1
  movsd  -0x30(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  addq   $0x20,-0x68(%rbp)
  addq   $0x8,-0x70(%rbp)
  addl   $0x1,-0x50(%rbp)
L7:
  mov    -0x50(%rbp),%eax
  cmp    -0x5c(%rbp),%eax
  jl     L109
  jmp    L76
L22:
  nop
L76:
  cmpl   $0x0,0x10(%rbp)
  je     L18
  mov    0x18(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  -0x48(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  mov    0x18(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x4c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  -0x40(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  mov    -0x4c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  -0x30(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
L18:
  mov    0x20(%rbp),%rax
  movsd  -0x48(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  cmpl   $0x1,-0x58(%rbp)
  jle    L82
  mov    -0x4c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    0x20(%rbp),%rax
  add    %rdx,%rax
  movsd  -0x40(%rbp),%xmm0
  movsd  %xmm0,(%rax)
L82:
  cmpl   $0x1,-0x54(%rbp)
  jle    L16
  mov    0x28(%rbp),%rax
  movsd  0x8(%rax),%xmm0
  movsd  %xmm0,-0x8(%rbp)
  movsd  -0x8(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x48(%rbp),%xmm1
  movsd  -0x38(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x8(%rbp),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x40(%rbp),%xmm1
  movsd  -0x30(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  mov    0x20(%rbp),%rax
  add    $0x8,%rax
  movsd  -0x38(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  cmpl   $0x1,-0x58(%rbp)
  jle    L36
  mov    -0x4c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    0x20(%rbp),%rax
  add    %rdx,%rax
  movsd  -0x30(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  jmp    L36
L16:
  nop
  jmp    L32
L36:
  nop
L32:
  pop    %rbp
  ret
```

assistant: ```c
void kernel_dtrsm_nn_ll_diag_2x2_vs_lib4(int km, int kn, int kmax, double *A, double *B, int sdb, int alg, double *C, double *D, double *E) {
  const int bs = 4;
  int k;
  double tmp, a_0, a_1, b_0, b_1, e_1, e_2, e_3, d_00 = 0, d_01 = 0, d_10 = 0, d_11 = 0;
  if (kmax <= 0)
    goto add;
  for (k = 0; k < kmax - 3; k += 4) {
    a_0 = A[0 + bs * 0];
    a_1 = A[1 + bs * 0];
    b_0 = B[0 + bs * 0];
    b_1 = B[0 + bs * 1];
    d_00 -= a_0 * b_0;
    d_10 -= a_1 * b_0;
    d_01 -= a_0 * b_1;
    d_11 -= a_1 * b_1;
    a_0 = A[0 + bs * 1];
    a_1 = A[1 + bs * 1];
    b_0 = B[1 + bs * 0];
    b_1 = B[1 + bs * 1];
    d_00 -= a_0 * b_0;
    d_10 -= a_1 * b_0;
    d_01 -= a_0 * b_1;
    d_11 -= a_1 * b_1;
    a_0 = A[0 + bs * 2];
    a_1 = A[1 + bs * 2];
    b_0 = B[2 + bs * 0];
    b_1 = B[2 + bs * 1];
    d_00 -= a_0 * b_0;
    d_10 -= a_1 * b_0;
    d_01 -= a_0 * b_1;
    d_11 -= a_1 * b_1;
    a_0 = A[0 + bs * 3];
    a_1 = A[1 + bs * 3];
    b_0 = B[3 + bs * 0];
    b_1 = B[3 + bs * 1];
    d_00 -= a_0 * b_0;
    d_10 -= a_1 * b_0;
    d_01 -= a_0 * b_1;
    d_11 -= a_1 * b_1;
    A += 16;
    B += 4 * sdb;
  }
  for (; k < kmax; k++) {
    a_0 = A[0 + bs * 0];
    a_1 = A[1 + bs * 0];
    b_0 = B[0 + bs * 0];
    b_1 = B[0 + bs * 1];
    d_00 -= a_0 * b_0;
    d_10 -= a_1 * b_0;
    d_01 -= a_0 * b_1;
    d_11 -= a_1 * b_1;
    A += 4;
    B += 1;
  }
add:
  if (alg != 0) {
    d_00 += C[0 + bs * 0];
    d_10 += C[1 + bs * 0];
    d_01 += C[0 + bs * 1];
    d_11 += C[1 + bs * 1];
  }
  D[0 + bs * 0] = d_00;
  if (kn >= 2)
    D[0 + bs * 1] = d_01;
  if (km < 2)
    return;
  e_1 = E[1 + bs * 0];
  d_10 -= e_1 * d_00;
  d_11 -= e_1 * d_01;
  D[1 + bs * 0] = d_10;
  if (kn >= 2)
    D[1 + bs * 1] = d_11;
  return;
}
```