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      1 //
      2 // gettsc.inl
      3 //
      4 // gives access to the Pentium's (secret) cycle counter
      5 //
      6 // This software was written by Leonard Janke (janke (at) unixg.ubc.ca)
      7 // in 1996-7 and is entered, by him, into the public domain.
      8 
      9 #if defined(__WATCOMC__)
     10 void GetTSC(unsigned long&);
     11 #pragma aux GetTSC = 0x0f 0x31 "mov [edi], eax" parm [edi] modify [edx eax];
     12 #elif defined(__GNUC__)
     13 inline
     14 void GetTSC(unsigned long& tsc)
     15 {
     16   asm volatile(".byte 15, 49\n\t"
     17 	       : "=eax" (tsc)
     18 	       :
     19 	       : "%edx", "%eax");
     20 }
     21 #elif defined(_MSC_VER)
     22 inline
     23 void GetTSC(unsigned long& tsc)
     24 {
     25   unsigned long a;
     26   __asm _emit 0fh
     27   __asm _emit 31h
     28   __asm mov a, eax;
     29   tsc=a;
     30 }
     31 #endif
     32 
     33 #include <stdio.h>
     34 #include <stdlib.h>
     35 #include <openssl/des.h>
     36 
     37 void main(int argc,char *argv[])
     38 	{
     39 	des_key_schedule key;
     40 	unsigned long s1,s2,e1,e2;
     41 	unsigned long data[2];
     42 	int i,j;
     43 
     44 	for (j=0; j<6; j++)
     45 		{
     46 		for (i=0; i<1000; i++) /**/
     47 			{
     48 			des_encrypt1(&data[0],key,1);
     49 			GetTSC(s1);
     50 			des_encrypt1(&data[0],key,1);
     51 			des_encrypt1(&data[0],key,1);
     52 			des_encrypt1(&data[0],key,1);
     53 			GetTSC(e1);
     54 			GetTSC(s2);
     55 			des_encrypt1(&data[0],key,1);
     56 			des_encrypt1(&data[0],key,1);
     57 			des_encrypt1(&data[0],key,1);
     58 			des_encrypt1(&data[0],key,1);
     59 			GetTSC(e2);
     60 			des_encrypt1(&data[0],key,1);
     61 			}
     62 
     63 		printf("des %d %d (%d)\n",
     64 			e1-s1,e2-s2,((e2-s2)-(e1-s1)));
     65 		}
     66 	}
     67 
     68