Code:
	// HaWe Brickbench
// benchmark test for NXT/EV3 and similar Micro Controllers
// Autor: (C) Helmut Wunder 2013,2014
// ported to Arduino Sketch/Wiring by Helmut Wunder
// freie Verwendung für private Zwecke
// für kommerzielle Zwecke nur nach schriftlicher Genehmigung durch den Autor.
// protected under the friendly Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License
// http://creativecommons.org/licenses/by-nc-sa/3.0/
//
// version 1.09.1.0022-noDisplay-noSort
#define TimerMS() millis()
unsigned long runtime[8];
//int a[500], b[500], c[500], t[500];
//--------------------------------------------
// Mersenne Twister
//--------------------------------------------
unsigned long randM(void) {
   
   const int M = 7;
   const unsigned long A[2] = { 0, 0x8ebfd028 };
   static unsigned long y[25];
   static int index = 25+1;
   if (index >= 25) {
     int k;
     if (index > 25) {
        unsigned long r = 9, s = 3402;
        for (k=0 ; k<25 ; ++k) {
          r = 509845221 * r + 3;
          s *= s + 1;
          y[k] = s + (r >> 10);
        }
     }
     for (k=0 ; k<25-M ; ++k)
        y[k] = y[k+M] ^ (y[k] >> 1) ^ A[y[k] & 1];
     for (; k<25 ; ++k)
        y[k] = y[k+(M-25)] ^ (y[k] >> 1) ^ A[y[k] & 1];
     index = 0;
   }
   unsigned long e = y[index++];
   e ^= (e << 7) & 0x2b5b2500;
   e ^= (e << 15) & 0xdb8b0000;
   e ^= (e >> 16);
   return e;
}
//--------------------------------------------
// Matrix Algebra
//--------------------------------------------
// matrix * matrix multiplication (matrix product)
 
 void MatrixMatrixMult(int N, int M, int K, double *A, double *B, double *C) {
   int i, j, s;
   for (i = 0; i < N; ++i) {
      for (j = 0; j < K; ++j) {
         C[i*K+j] = 0;
         for (s = 0; s < M; ++s) {
            C[i*K+j] = C[i*K+j] + A[i*N+s] * B[s*M+j];
         }
      }
   }
}
// matrix determinant
double MatrixDet(int N, double A[]) {
   int i, j, i_count, j_count, count = 0;
   double Asub[N - 1][N - 1], det = 0;
   if (N == 1)
      return *A;
   if (N == 2)
      return ((*A) * (*(A+1+1*N)) - (*(A+1*N)) * (*(A+1)));
   for (count = 0; count < N; count++) {
      i_count = 0;
      for (i = 1; i < N; i++) {
         j_count = 0;
         for (j = 0; j < N; j++) {
            if (j == count)
               continue;
            Asub[i_count][j_count] = *(A+i+j*N);
            j_count++;
         }
         i_count++;
      }
      det += pow(-1, count) * A[0+count*N] * MatrixDet(N - 1, &Asub[0][0]);
   }
   return det;
}
//--------------------------------------------
// shell sort
//--------------------------------------------
void shellsort(int size, int* A)
{
  int i, j, increment;
  int temp;
  increment = size / 2;
  while (increment > 0) {
    for (i = increment; i < size; i++) {
      j = i;
      temp = A[i];
      while ((j >= increment) && (A[j-increment] > temp)) {
        A[j] = A[j - increment];
        j = j - increment;
      }
      A[j] = temp;
    }
    if (increment == 2)
       increment = 1;
    else
       increment = (unsigned int) (increment / 2.2);
  }
}
//--------------------------------------------
// gnu quick sort
// (0ptional)
//--------------------------------------------
int compare_int (const int *a, const int *b)
{
  int  temp = *a - *b;
  if (temp > 0)          return  1;
  else if (temp < 0)     return -1;
  else                   return  0;
}
// gnu qsort:
// void qsort (void *a , size_a count, size_a size, compare_function)
// gnu qsort call for a[500] array of int:
// qsort (a , 500, sizeof(a), compare_int)
//--------------------------------------------
// benchmark test procedures
//--------------------------------------------
int test_Int_Add() {
   int i=1, j=11, k=112, l=1111, m=11111, n=-1, o=-11, p=-111, q=-1112, r=-11111;
   int x;
   volatile long s=0;
   for(x=0;x<10000;++x) {
     s+=i; s+=j; s+=k; s+=l; s+=m; s+=n; s+=o; s+=p; s+=q; s+=r;
   }
   return s;
}
long test_Int_Mult() {
  int x,y;
  volatile long s;
  for(y=0;y<2000;++y) {
    s=1;
    for(x=1;x<=13;++x) { s*=x;}
    for(x=13;x>0;--x) { s/=x;}
  }
  return s;
}
#define PI  M_PI
double test_float_math() {
  volatile double s=PI;
  int y;
  for(y=0;y<1000;++y) {
     s*=sqrt(s);
     s=sin(s);
     s=exp(s);
     s*=s;
  }
  return s;
}
long test_rand_MT(){
  volatile unsigned long s;
  int y;
  for(y=0;y<5000;++y) {
     s=randM()%10001;
  }
  return s;
}
double test_matrix_math() {
  int x;
  double A[2][2], B[2][2], C[2][2];
  double S[3][3], T[3][3];
  unsigned long s;
  for(x=0;x<250;++x) {
    A[0][0]=1;   A[0][1]=3;
    A[1][0]=2;   A[1][1]=4;
    B[0][0]=10;  B[0][1]=30;
    B[1][0]=20;  B[1][1]=40;
    MatrixMatrixMult(2, 2, 2, A[0], B[0], C[0]); // <<<<<<<<<<<<<<<<<<<
    A[0][0]=1;   A[0][1]=3;
    A[1][0]=2;   A[1][1]=4;
    MatrixDet(2, A[0]);                          // <<<<<<<<<<<<<<<<<<<
    S[0][0]=1;   S[0][1]=4;  S[0][2]=7;
    S[1][0]=2;   S[1][1]=5;  S[1][2]=8;
    S[2][0]=3;   S[2][1]=6;  S[2][2]=9;
    MatrixDet(3, S[0]);                          // <<<<<<<<<<<<<<<<<<<
  }
  s=(S[0][0]*S[1][1]*S[2][2]);
  return s;
}
// for array copy using void *memcpy(void *dest, const void *src, size_t n);
long test_Sort(){
  unsigned long s;
  int y, i;
/*  
  int t[500];
 
  for(y=0;y<30;++y) {
    memcpy(t, a, sizeof(a));
    shellsort(500, t);
   
    memcpy(t, a, sizeof(b));
    shellsort(500, t);
   
    memcpy(t, a, sizeof(c));
    shellsort(500, t);
  }
*/
  return y;
}
inline void displayValues() {
  char buf[120];
  /*
  myGLCD.clrScr();
    sprintf (buf, "%3d %9ld  int_Add",    0, runtime[0]); myGLCD.print(buf, 0,10);
    sprintf (buf, "%3d %9ld  int_Mult",   1, runtime[1]); myGLCD.print(buf, 0,20);
    sprintf (buf, "%3d %9ld  float_op",   2, runtime[2]); myGLCD.print(buf, 0,30);
    sprintf (buf, "%3d %9ld  randomize",  3, runtime[3]); myGLCD.print(buf, 0,40);
    sprintf (buf, "%3d %9ld  matrx_algb", 4, runtime[4]); myGLCD.print(buf, 0,50);
    sprintf (buf, "%3d %9ld  arr_sort",   5, runtime[5]); myGLCD.print(buf, 0,60);
    sprintf (buf, "%3d %9ld  TextOut",    6, runtime[6]); myGLCD.print(buf, 0,70);
    sprintf (buf, "%3d %9ld  Graphics",   7, runtime[7]); myGLCD.print(buf, 0,80);
  */ 
   
}
int test(){
  unsigned long time0, x, y;
  double s;
  char  buf[120];
  int   i;
  float f;
 /*
  for(y=0;y<500;++y) {
    a[y]=randM()%30000; b[y]=randM()%30000; c[y]=randM()%30000;
  }
 */
 
  time0= TimerMS();;
  s=test_Int_Add();
  runtime[0]=TimerMS()-time0;
  sprintf (buf, "%3d %9ld  int_Add",    0, runtime[0]); Serial.println( buf);
  time0=TimerMS();
  s=test_Int_Mult();
  runtime[1]=TimerMS()-time0;
  sprintf (buf, "%3d %9ld  int_Mult",   1, runtime[1]); Serial.println( buf);
  time0=TimerMS();
  s=test_float_math();
  runtime[2]=TimerMS()-time0;
  sprintf (buf, "%3d %9ld  float_op",   2, runtime[2]); Serial.println( buf);
  time0=TimerMS();
  s=test_rand_MT();
  runtime[3]=TimerMS()-time0;
  sprintf (buf, "%3d %9ld  randomize",  3, runtime[3]); Serial.println( buf);
 
  time0=TimerMS();
  s=test_matrix_math();
  runtime[4]=TimerMS()-time0;
  sprintf (buf, "%3d %9ld  matrx_algb", 4, runtime[4]); Serial.println( buf);
 
  time0=TimerMS();
  //s=test_Sort();
  runtime[5]=TimerMS()-time0;
  sprintf (buf, "%3d %9ld  arr_sort N/A",   5, runtime[5]); Serial.println( buf);
 
 
  // lcd display text / graphs
 
  time0=TimerMS();
  //s=test_TextOut();
  runtime[6]=TimerMS()-time0;
  sprintf (buf, "%3d %9ld  TextOut N/A", 6, runtime[6]); Serial.println( buf);
 
  time0=TimerMS();
  //s=test_graphics();
  runtime[7]=TimerMS()-time0;
  sprintf (buf, "%3d %9ld  Graphics N/A", 7, runtime[7]); Serial.println( buf);
 
  Serial.println();
 
  y = 0;
  for (x = 0; x < 8; ++x) {
      y += runtime[x];
  }
 
  displayValues();
 
  sprintf (buf, "gesamt ms: %9ld ", y);
  Serial.println( buf);
 
  x=50000000.0/y;
  sprintf (buf, "benchmark: %9ld ", x);
  Serial.println( buf);
  return 1;
}
void setup() {
 
  Serial.begin(115200);
 
}
void loop() {
  char  buf[120];
  test();
 
  sprintf (buf, "Ende HaWe brickbench");   
  Serial.println( buf);
 
  while(1);
}
 was gibt er aus bei Tests 0-4?
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