user: What would the C source look like for the assembly code provided here:

```asm
<matmul>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x70,%rsp
  mov    %edi,-0x54(%rbp)
  mov    %rsi,-0x60(%rbp)
  mov    %rdx,-0x68(%rbp)
  mov    %rcx,-0x70(%rbp)
  movl   $0x2,-0x3c(%rbp)
  mov    -0x54(%rbp),%eax
  mov    %eax,-0x38(%rbp)
  mov    -0x38(%rbp),%eax
  cltd
  idivl  -0x3c(%rbp)
  mov    %eax,-0x34(%rbp)
  mov    -0x60(%rbp),%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x54(%rbp),%eax
  imul   %eax,%eax
  cltq
  shl    $0x3,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x28(%rbp)
  mov    -0x70(%rbp),%rax
  mov    %rax,-0x20(%rbp)
  mov    -0x28(%rbp),%rdx
  mov    -0x68(%rbp),%rcx
  mov    -0x54(%rbp),%eax
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <transpose@plt>
  movl   $0x0,-0x48(%rbp)
  jmp    L151
L6:
  movl   $0x0,-0x44(%rbp)
  jmp    L2
L134:
  movl   $0x0,-0x40(%rbp)
  jmp    L94
L165:
  mov    -0x48(%rbp),%eax
  imul   -0x3c(%rbp),%eax
  imul   -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%eax
  imul   -0x3c(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x44(%rbp),%eax
  imul   -0x3c(%rbp),%eax
  imul   -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x40(%rbp),%eax
  imul   -0x3c(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x48(%rbp),%eax
  imul   -0x3c(%rbp),%eax
  imul   -0x38(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x44(%rbp),%eax
  imul   -0x3c(%rbp),%eax
  cltq
  add    %rdx,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  movsd  (%rax),%xmm1
  mov    -0x18(%rbp),%rax
  movsd  (%rax),%xmm2
  mov    -0x10(%rbp),%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm0,%xmm2
  mov    -0x18(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm3
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm3,%xmm0
  addsd  %xmm2,%xmm0
  addsd  %xmm1,%xmm0
  mov    -0x8(%rbp),%rax
  movsd  %xmm0,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  mov    -0x18(%rbp),%rax
  movsd  (%rax),%xmm2
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm0,%xmm2
  mov    -0x18(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm3
  mov    -0x38(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm3,%xmm0
  addsd  %xmm2,%xmm0
  mov    -0x8(%rbp),%rax
  add    $0x8,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm2
  mov    -0x10(%rbp),%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm0,%xmm2
  mov    -0x38(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm3
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm3,%xmm0
  addsd  %xmm2,%xmm0
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x38(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm2
  mov    -0x38(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm0,%xmm2
  mov    -0x38(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm3
  mov    -0x38(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x10(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm3,%xmm0
  addsd  %xmm2,%xmm0
  mov    -0x38(%rbp),%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x8(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  addl   $0x1,-0x40(%rbp)
L94:
  mov    -0x40(%rbp),%eax
  cmp    -0x34(%rbp),%eax
  jl     L165
  addl   $0x1,-0x44(%rbp)
L2:
  mov    -0x44(%rbp),%eax
  cmp    -0x34(%rbp),%eax
  jl     L134
  addl   $0x1,-0x48(%rbp)
L151:
  mov    -0x48(%rbp),%eax
  cmp    -0x34(%rbp),%eax
  jl     L6
  mov    -0x54(%rbp),%eax
  and    $0x1,%eax
  test   %eax,%eax
  je     L127
  movl   $0x0,-0x48(%rbp)
  jmp    L147
L0:
  movl   $0x0,-0x44(%rbp)
  jmp    L53
L190:
  mov    -0x48(%rbp),%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x44(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x48(%rbp),%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x38(%rbp),%eax
  add    %edx,%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm2
  mov    -0x38(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x44(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm2,%xmm0
  mov    -0x48(%rbp),%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x44(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  addl   $0x1,-0x44(%rbp)
L53:
  mov    -0x38(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x44(%rbp)
  jl     L190
  addl   $0x1,-0x48(%rbp)
L147:
  mov    -0x38(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x48(%rbp)
  jl     L0
  movl   $0x0,-0x48(%rbp)
  jmp    L4
L52:
  movl   $0x0,-0x40(%rbp)
  jmp    L168
L9:
  mov    -0x48(%rbp),%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x38(%rbp),%eax
  add    %edx,%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x48(%rbp),%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x40(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm2
  mov    -0x40(%rbp),%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x38(%rbp),%eax
  add    %edx,%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm2,%xmm0
  mov    -0x48(%rbp),%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x38(%rbp),%eax
  add    %edx,%eax
  cltq
  shl    $0x3,%rax
  lea    -0x8(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  addl   $0x1,-0x40(%rbp)
L168:
  mov    -0x40(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L9
  addl   $0x1,-0x48(%rbp)
L4:
  mov    -0x48(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L52
  movl   $0x0,-0x48(%rbp)
  jmp    L125
L117:
  movl   $0x0,-0x40(%rbp)
  jmp    L72
L79:
  mov    -0x38(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x48(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x38(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x40(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm2
  mov    -0x40(%rbp),%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x48(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm2,%xmm0
  mov    -0x38(%rbp),%eax
  sub    $0x1,%eax
  imul   -0x38(%rbp),%eax
  mov    %eax,%edx
  mov    -0x48(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  addl   $0x1,-0x40(%rbp)
L72:
  mov    -0x40(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L79
  addl   $0x1,-0x48(%rbp)
L125:
  mov    -0x38(%rbp),%eax
  sub    $0x1,%eax
  cmp    %eax,-0x48(%rbp)
  jl     L117
  jmp    L129
L127:
  nop
L129:
  leave
  ret
```

assistant: ```c
void matmul(int i_matdim, const double *pd_A, const double *pd_B, double *pd_C) {
  int i, j, k;
  int n = 2;
  int N = i_matdim;
  int Ntiles = N / n;
  double *A = pd_A;
  double *B = (double *)malloc(i_matdim * i_matdim * sizeof(double));
  double *C = pd_C;
  transpose(i_matdim, pd_B, B);
  for (i = 0; i < Ntiles; i++)
    for (j = 0; j < Ntiles; j++)
      for (k = 0; k < Ntiles; k++) {
        double *bA = A + i * n * N + k * n;
        double *bB = B + j * n * N + k * n;
        double *bC = C + i * n * N + j * n;
        bC[0] += bA[0] * bB[0] + bA[1] * bB[1];
        bC[1] += bA[0] * bB[N] + bA[1] * bB[N + 1];
        bC[N] += bA[N] * bB[0] + bA[N + 1] * bB[1];
        bC[N + 1] += bA[N] * bB[N] + bA[N + 1] * bB[N + 1];
      }
  if ((i_matdim & 1) == 0)
    return;
  for (i = 0; i < N - 1; i++)
    for (j = 0; j < N - 1; j++) {
      C[i * N + j] += A[i * N + N - 1] * pd_B[(N - 1) * N + j];
    }
  for (i = 0; i < N; i++)
    for (k = 0; k < N; k++)
      C[i * N + N - 1] += A[i * N + k] * pd_B[k * N + N - 1];
  for (i = 0; i < N - 1; i++)
    for (k = 0; k < N; k++)
      C[(N - 1) * N + i] += A[(N - 1) * N + k] * pd_B[k * N + i];
}
```