dhry.c

gcc-you can use this code to learn something about gcc, and inquire further into linux,

/*
 ****************************************************************************
 *
 *                   "DHRYSTONE" Benchmark Program
 *                   -----------------------------
 *                                                                            
 *  Version:    C, Version 2.1
 *                                                                            
 *  File:       dhry_1.c (part 2 of 3)
 *
 *  Date:       May 25, 1988
 *
 *  Author:     Reinhold P. Weicker
 *
 ****************************************************************************
 */

#include "dhry.h"

/* Global Variables: */

Rec_Pointer     Ptr_Glob,
                Next_Ptr_Glob;
int             Int_Glob;
Boolean         Bool_Glob;
char            Ch_1_Glob,
                Ch_2_Glob;
int             Arr_1_Glob [50];
int             Arr_2_Glob [50] [50];

extern char     *malloc ();
Enumeration     Func_1 ();
  /* forward declaration necessary since Enumeration may not simply be int */

#ifndef REG
        Boolean Reg = false;
#define REG
        /* REG becomes defined as empty */
        /* i.e. no register variables   */
#else
        Boolean Reg = true;
#endif

/* variables for time measurement: */

/*
#ifdef TIMES
struct tms      time_info;
extern  int     times ();
#endif
*/           
/*
#ifdef TIME
extern long     time();
#endif
*/
#define Too_Small_Time 2
                /* Measurements should last at least 2 seconds */

long            Begin_Time,
                End_Time,
                User_Time;
float           Microseconds,
                Dhrystones_Per_Second;

/* end of variables for time measurement */


main ()
/*****/

  /* main program, corresponds to procedures        */
  /* Main and Proc_0 in the Ada version             */
{
        One_Fifty       Int_1_Loc;
  REG   One_Fifty       Int_2_Loc;
        One_Fifty       Int_3_Loc;
  REG   char            Ch_Index;
        Enumeration     Enum_Loc;
        Str_30          Str_1_Loc;
        Str_30          Str_2_Loc;
  REG   int             Run_Index;
  REG   int             Number_Of_Runs;

  /* Initializations */

  Next_Ptr_Glob = (Rec_Pointer) malloc (sizeof (Rec_Type));
  Ptr_Glob = (Rec_Pointer) malloc (sizeof (Rec_Type));

  Ptr_Glob->Ptr_Comp                    = Next_Ptr_Glob;
  Ptr_Glob->Discr                       = Ident_1;
  Ptr_Glob->variant.var_1.Enum_Comp     = Ident_3;
  Ptr_Glob->variant.var_1.Int_Comp      = 40;
  strcpy (Ptr_Glob->variant.var_1.Str_Comp, 
          "DHRYSTONE PROGRAM, SOME STRING");
  strcpy (Str_1_Loc, "DHRYSTONE PROGRAM, 1'ST STRING");

  Arr_2_Glob [8][7] = 10;
        /* Was missing in published program. Without this statement,    */
        /* Arr_2_Glob [8][7] would have an undefined value.             */
        /* Warning: With 16-Bit processors and Number_Of_Runs > 32000,  */
        /* overflow may occur for this array element.                   */

/*
  printf ("\n");
  printf ("Dhrystone Benchmark, Version 2.1 (Language: C)\n");
  printf ("\n");
*/
  if (Reg)
  {
/*
    printf ("Program compiled with 'register' attribute\n");
    printf ("\n");
*/
  }
  else
  {
/*
    printf ("Program compiled without 'register' attribute\n");
    printf ("\n");
*/
  }
/*
  printf ("Please give the number of runs through the benchmark: ");
*/
  {
    int n;
/*
    scanf ("%d", &n);
*/
    Number_Of_Runs = n=1000;
  }
/*
  printf ("\n");

  printf ("Execution starts, %d runs through Dhrystone\n", Number_Of_Runs);
*/

  /***************/
  /* Start timer */
  /***************/

/* 
#ifdef TIMES
  times (&time_info);
  Begin_Time = (long) time_info.tms_utime;
#endif
#ifdef TIME
  Begin_Time = time ( (long *) 0);
#endif
*/

  for (Run_Index = 1; Run_Index <= Number_Of_Runs; ++Run_Index)
  {

    Proc_5();
    Proc_4();
      /* Ch_1_Glob == 'A', Ch_2_Glob == 'B', Bool_Glob == true */
    Int_1_Loc = 2;
    Int_2_Loc = 3;
    strcpy (Str_2_Loc, "DHRYSTONE PROGRAM, 2'ND STRING");
    Enum_Loc = Ident_2;
    Bool_Glob = ! Func_2 (Str_1_Loc, Str_2_Loc);
      /* Bool_Glob == 1 */
    while (Int_1_Loc < Int_2_Loc)  /* loop body executed once */
    {
      Int_3_Loc = 5 * Int_1_Loc - Int_2_Loc;
        /* Int_3_Loc == 7 */
      Proc_7 (Int_1_Loc, Int_2_Loc, &Int_3_Loc);
        /* Int_3_Loc == 7 */
      Int_1_Loc += 1;
    } /* while */
      /* Int_1_Loc == 3, Int_2_Loc == 3, Int_3_Loc == 7 */
    Proc_8 (Arr_1_Glob, Arr_2_Glob, Int_1_Loc, Int_3_Loc);
      /* Int_Glob == 5 */
    Proc_1 (Ptr_Glob);
    for (Ch_Index = 'A'; Ch_Index <= Ch_2_Glob; ++Ch_Index)
                             /* loop body executed twice */
    {
      if (Enum_Loc == Func_1 (Ch_Index, 'C'))
          /* then, not executed */
        {
        Proc_6 (Ident_1, &Enum_Loc);
        strcpy (Str_2_Loc, "DHRYSTONE PROGRAM, 3'RD STRING");
        Int_2_Loc = Run_Index;
        Int_Glob = Run_Index;
        }
    }
      /* Int_1_Loc == 3, Int_2_Loc == 3, Int_3_Loc == 7 */
    Int_2_Loc = Int_2_Loc * Int_1_Loc;
    Int_1_Loc = Int_2_Loc / Int_3_Loc;
    Int_2_Loc = 7 * (Int_2_Loc - Int_3_Loc) - Int_1_Loc;
      /* Int_1_Loc == 1, Int_2_Loc == 13, Int_3_Loc == 7 */
    Proc_2 (&Int_1_Loc);
      /* Int_1_Loc == 5 */

  } /* loop "for Run_Index" */

  /**************/
  /* Stop timer */
  /**************/
 
/* 
#ifdef TIMES
  times (&time_info);
  End_Time = (long) time_info.tms_utime;
#endif
#ifdef TIME
  End_Time = time ( (long *) 0);
#endif
*/

/*
  printf ("Execution ends\n");
  printf ("\n");
  printf ("Final values of the variables used in the benchmark:\n");
  printf ("\n");
  printf ("Int_Glob:            %d\n", Int_Glob);
  printf ("        should be:   %d\n", 5);
  printf ("Bool_Glob:           %d\n", Bool_Glob);
  printf ("        should be:   %d\n", 1);
  printf ("Ch_1_Glob:           %c\n", Ch_1_Glob);
  printf ("        should be:   %c\n", 'A');
  printf ("Ch_2_Glob:           %c\n", Ch_2_Glob);
  printf ("        should be:   %c\n", 'B');
  printf ("Arr_1_Glob[8]:       %d\n", Arr_1_Glob[8]);
  printf ("        should be:   %d\n", 7);
  printf ("Arr_2_Glob[8][7]:    %d\n", Arr_2_Glob[8][7]);
  printf ("        should be:   Number_Of_Runs + 10\n");
  printf ("Ptr_Glob->\n");
  printf ("  Ptr_Comp:          %d\n", (int) Ptr_Glob->Ptr_Comp);
  printf ("        should be:   (implementation-dependent)\n");
  printf ("  Discr:             %d\n", Ptr_Glob->Discr);
  printf ("        should be:   %d\n", 0);
  printf ("  Enum_Comp:         %d\n", Ptr_Glob->variant.var_1.Enum_Comp);
  printf ("        should be:   %d\n", 2);
  printf ("  Int_Comp:          %d\n", Ptr_Glob->variant.var_1.Int_Comp);
  printf ("        should be:   %d\n", 17);
  printf ("  Str_Comp:          %s\n", Ptr_Glob->variant.var_1.Str_Comp);
  printf ("        should be:   DHRYSTONE PROGRAM, SOME STRING\n");
  printf ("Next_Ptr_Glob->\n");
  printf ("  Ptr_Comp:          %d\n", (int) Next_Ptr_Glob->Ptr_Comp);
  printf ("        should be:   (implementation-dependent), same as above\n");
  printf ("  Discr:             %d\n", Next_Ptr_Glob->Discr);
  printf ("        should be:   %d\n", 0);
  printf ("  Enum_Comp:         %d\n", Next_Ptr_Glob->variant.var_1.Enum_Comp);
  printf ("        should be:   %d\n", 1);
  printf ("  Int_Comp:          %d\n", Next_Ptr_Glob->variant.var_1.Int_Comp);
  printf ("        should be:   %d\n", 18);
  printf ("  Str_Comp:          %s\n",
                                Next_Ptr_Glob->variant.var_1.Str_Comp);
  printf ("        should be:   DHRYSTONE PROGRAM, SOME STRING\n");
  printf ("Int_1_Loc:           %d\n", Int_1_Loc);
  printf ("        should be:   %d\n", 5);
  printf ("Int_2_Loc:           %d\n", Int_2_Loc);
  printf ("        should be:   %d\n", 13);
  printf ("Int_3_Loc:           %d\n", Int_3_Loc);
  printf ("        should be:   %d\n", 7);
  printf ("Enum_Loc:            %d\n", Enum_Loc);
  printf ("        should be:   %d\n", 1);
  printf ("Str_1_Loc:           %s\n", Str_1_Loc);
  printf ("        should be:   DHRYSTONE PROGRAM, 1'ST STRING\n");
  printf ("Str_2_Loc:           %s\n", Str_2_Loc);
  printf ("        should be:   DHRYSTONE PROGRAM, 2'ND STRING\n");
  printf ("\n");
*/

  User_Time = End_Time - Begin_Time;

  if (User_Time < Too_Small_Time)
  {
/*
    printf ("Measured time too small to obtain meaningful results\n");
    printf ("Please increase number of runs\n");
    printf ("\n");
*/
  }
  else
  {
#ifdef TIME
/*
    Microseconds = (float) User_Time * Mic_secs_Per_Second 
                        / (float) Number_Of_Runs;
    Dhrystones_Per_Second = (float) Number_Of_Runs / (float) User_Time;
*/
#else
/*
    Microseconds = (float) User_Time * Mic_secs_Per_Second 
                        / ((float) HZ * ((float) Number_Of_Runs));
    Dhrystones_Per_Second = ((float) HZ * (float) Number_Of_Runs)
                        / (float) User_Time;
*/
#endif
/*
    printf ("Microseconds for one run through Dhrystone: ");
    printf ("%6.1f \n", Microseconds);
    printf ("Dhrystones per Second:                      ");
    printf ("%6.1f \n", Dhrystones_Per_Second);
    printf ("\n");
*/
  }