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//**************************************
//
//INCLUDE files for :Benchmark to test B
// ITCNT_x.C functions
//**************************************
//
/* bittops.h +++Date last modified: 05-Jul-1997 */
/*
** Macros and prototypes for bit operations
**
** public domain for SNIPPETS by:
**Scott Dudley
**Auke Reitsma
**Ratko Tomic
**Aare Tali
**J. Blauth
**Bruce Wedding
**Bob Stout
*/
#ifndef BITOPS__H
#define BITOPS__H
#include
#include
#include
#include "sniptype.h"/* for TOBOOL() */
#include "extkword.h"/* for CDECL*/
/*
** Macros to manipulate bits in any integral data type.
*/
#define BitSet(arg,posn) ((arg) | (1L << (posn)))
#define BitClr(arg,posn) ((arg) & ~(1L << (posn)))
#define BitFlp(arg,posn) ((arg) ^ (1L << (posn)))
#define BitTst(arg,posn) TOBOOL((arg) & (1L << (posn)))
/*
** Macros to manipulate bits in an array of char.
** These macros assume CHAR_BIT is one of either 8, 16, or 32.
*/
#define MASK CHAR_BIT-1
#define SHIFT ((CHAR_BIT==8)?3:(CHAR_BIT==16)?4:8)
#define BitOff(a,x) ((void)((a)[(x)>>SHIFT] &= ~(1 << ((x)&MASK))))
#define BitOn(a,x)((void)((a)[(x)>>SHIFT] |= (1 << ((x)&MASK))))
#define BitFlip(a,x) ((void)((a)[(x)>>SHIFT] ^= (1 << ((x)&MASK))))
#define IsBit(a,x)((a)[(x)>>SHIFT]&(1 << ((x)&MASK)))
/*
** BITARRAY.C
*/
char *alloc_bit_array(size_t bits);
intgetbit(char *set, int number);
void setbit(char *set, int number, int value);
void flipbit(char *set, int number);
/*
** BITFILES.C
*/
typedef struct {
FILE * file;/* for stream I/O*/
charrbuf;/* read bit buffer */
charrcnt;/* read bit count*/
charwbuf;/* write bit buffer */
charwcnt;/* write bit count */
} bfile;
bfile * bfopen(char *name, char *mode);
int bfread(bfile *bf);
voidbfwrite(int bit, bfile *bf);
voidbfclose(bfile *bf);
/*
** BITSTRNG.C
*/
void bitstring(char *str, long byze, int biz, int strwid);
/*
** BSTR_I.C
*/
unsigned int bstr_i(char *cptr);
/*
** BITCNT_1.C
*/
int CDECL bit_count(long x);
/*
** BITCNT_2.C
*/
int CDECL bitcount(long i);
/*
** BITCNT_3.C
*/
int CDECL ntbl_bitcount(long int x);
int CDECL BW_btbl_bitcount(long int x);
int CDECL AR_btbl_bitcount(long int x);
/*
** BITCNT_4.C
*/
int CDECL ntbl_bitcnt(long x);
int CDECL btbl_bitcnt(long x);
#endif /* BITOPS__H */
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//
/*
** BITCNTS.C - Test program for bit counting functions
**
** public domain by Bob Stout & Auke Reitsma
*/
#include
#include
#include
#include
#include
#include
#include "bitops.h"
#define ITERS 1500000L
#define FUNCS 8
static int CDECL bit_shifter(long int x);
int main(void)
{
clock_t start, stop;
double ct, cmin = DBL_MAX, cmax = 0;
int i, cminix, cmaxix;
long j, n;
static int (* CDECL pBitCntFunc[FUNCS])(long) = {
bit_count,
bitcount,
ntbl_bitcnt,
ntbl_bitcount,
btbl_bitcnt,
BW_btbl_bitcount,
AR_btbl_bitcount,
bit_shifter
};
static char *text[FUNCS] = {
"Optimized 1 bit/loop counter",
"Ratko's mystery algorithm",
"Recursive bit count by nybbles",
"Non-recursive bit count by nybbles",
"Recursive bit count by bytes",
"Non-recursive bit count by bytes (BW)",
"Non-recursive bit count by bytes (AR)",
"Shift and count bits"
};
puts("Bit counter algorithm benchmark\n");
for (i = 0; i < FUNCS; i++)
{
start = clock();
for (j = n = 0; j < ITERS; j++)
n += pBitCntFunc[i](j);
stop = clock();
ct = (stop - start) / (double)CLOCKS_PER_SEC;
if (ct < cmin)
{
cmin = ct;
cminix = i;
}
if (ct > cmax)
{
cmax = ct;
cmaxix = i;
}
printf("%-38s> Time: %7.3f sec.; Bits: %ld\n", text[i], ct, n);
}
printf("\nBest > %s\n", text[cminix]);
printf("Worst > %s\n", text[cmaxix]);
return 0;
}
static int CDECL bit_shifter(long int x)
{
int i, n;
for (i = n = 0; x && (i < (sizeof(long) * CHAR_BIT)); ++i, x >>= 1)
n += (int)(x & 1L);
return n;
}