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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <math.h>
#include <limits.h>
#include <time.h>
#include "cleanbench.h"
#include "randnum.h"
/************************
** BITFIELD OPERATIONS **
*************************/
#ifdef _LP64
#define ARRAY_SIZE 16384L
#else
#define ARRAY_SIZE 32768L
#endif
static clock_t DoBitfieldIteration(unsigned long *bitarray,
unsigned long *bitoparray,
long bitop_array_size,
unsigned long *nbitops);
static void ToggleBitRun(unsigned long *bitmap,
unsigned long bit_addr,
unsigned long nbits,
unsigned int val);
static void FlipBitRun(unsigned long *bitmap,
unsigned long bit_addr,
unsigned long nbits);
/*************
** DoBitops **
**************
** Perform the bit operations test portion of the CPU
** benchmark. Returns the iterations per second.
*/
double
DoBitops(void)
{
const char* context = "CPU:Bitfields";
unsigned long* bitarray = NULL;
unsigned long* bitoparray = NULL;
clock_t total_time = 0;
int iterations = 0;
unsigned long nbitops;
static bool is_adjusted = false;
static int bitop_array_size = -70; /* -70 because we want to malloc 30 and we add 100 to it in the loop */
if (is_adjusted == false) {
is_adjusted = true;
bitarray = realloc(bitarray, ARRAY_SIZE * sizeof(unsigned long));
if (!bitarray) {
fprintf(stderr, "Error in %s, could not allocate memory. Exitting...\n", context);
exit(1);
}
do {
bitop_array_size += 100;
bitoparray = malloc(bitop_array_size * 2 * sizeof(unsigned long));
if (!bitoparray) {
fprintf(stderr, "Error in %s, could not allocate memory. Exitting...\n", context);
free(bitarray);
exit(1);
}
/*
** Do an iteration of the bitmap test. If the
** elapsed time is less than or equal to the permitted
** minimum, then de-allocate the array, reallocate a
** larger version, and try again.
*/
} while (DoBitfieldIteration(bitarray, bitoparray, bitop_array_size, &nbitops) <= MINIMUM_TICKS);
} else {
/*
** Don't need to do self adjustment, just allocate
** the array space.
*/
bitarray = malloc(ARRAY_SIZE * sizeof(unsigned long));
if (!bitarray) {
fprintf(stderr, "Error in %s, could not allocate memory. Exitting...\n", context);
exit(1);
}
bitoparray = malloc(bitop_array_size * 2 * sizeof(unsigned long));
if (!bitoparray) {
fprintf(stderr, "Error in %s, could not allocate memory. Exitting...\n", context);
free(bitarray);
exit(1);
}
}
/*
** All's well if we get here. Repeatedly perform bitops until the
** accumulated elapsed time is greater than # of seconds requested.
*/
do {
total_time += DoBitfieldIteration(bitarray, bitoparray, bitop_array_size,&nbitops);
iterations += nbitops;
} while (total_time < MINIMUM_SECONDS * CLOCKS_PER_SEC);
free(bitarray);
free(bitoparray);
return (double)(iterations * CLOCKS_PER_SEC) / (double)total_time;
}
/************************
** DoBitfieldIteration **
*************************
** Perform a single iteration of the bitfield benchmark.
** Return the # of ticks accumulated by the operation.
*/
static clock_t
DoBitfieldIteration(unsigned long *bitarray, unsigned long *bitoparray, long bitop_array_size, unsigned long *nbitops)
{
clock_t start, stop;
long i;
unsigned long bitoffset;
/*
** Clear # bitops counter
*/
*nbitops = 0L;
/*
** Construct a set of bitmap offsets and run lengths.
** The offset can be any random number from 0 to the
** size of the bitmap (in bits). The run length can
** be any random number from 1 to the number of bits
** between the offset and the end of the bitmap.
** Note that the bitmap has 8192 * 32 bits in it.
** (262,144 bits)
*/
/*
** Reset random number generator so things repeat.
** Also reset the bit array we work on.
** added by Uwe F. Mayer
*/
randnum(13);
for (i = 0; i < ARRAY_SIZE; i++) {
#ifdef _LP64
*(bitarray+i) = 0x5555555555555555UL;
#else
*(bitarray+i) = 0x55555555UL;
#endif
}
randnum(13);
for (i = 0; i < bitop_array_size; i++) {
/* First item is offset */
*(bitoparray + i + i) = bitoffset = abs_randwc((int32_t)262140);
/* Next item is run length */
*nbitops += *(bitoparray + i + i + 1L) = abs_randwc((int32_t)262140 - bitoffset);
}
start = clock();
for(i = 0; i < bitop_array_size; i++) {
switch(i % 3) {
case 2: /* Complement run of bits */
FlipBitRun(bitarray,
*(bitoparray+i+i),
*(bitoparray+i+i+1));
break;
default:
ToggleBitRun(bitarray,
*(bitoparray+i+i),
*(bitoparray+i+i+1),
!i);
break;
}
}
stop = clock();
return stop - start;
}
/***************
** FlipBitRun **
****************
** Complements a run of bits.
*/
static void
FlipBitRun(unsigned long *bitmap, unsigned long bit_addr, unsigned long nbits)
{
unsigned long bindex; /* Index into array */
unsigned long bitnumb; /* Bit number */
while (nbits--) {
#ifdef _LP64
bindex=bit_addr>>6; /* Index is number /64 */
bitnumb=bit_addr % 64; /* Bit number in longword */
#else
bindex=bit_addr>>5; /* Index is number /32 */
bitnumb=bit_addr % 32; /* Bit number in longword */
#endif
bitmap[bindex]^=(1L<<bitnumb);
bit_addr++;
}
}
/*****************************
** ToggleBitRun *
******************************
** Set or clear a run of nbits starting at
** bit_addr in bitmap.
*/
void ToggleBitRun(unsigned long *bitmap, /* Bitmap */
unsigned long bit_addr, /* Address of bits to set */
unsigned long nbits, /* # of bits to set/clr */
unsigned int val) /* 1 or 0 */
{
unsigned long bindex; /* Index into array */
unsigned long bitnumb; /* Bit number */
if (val) {
for (; nbits != 0; nbits--) {
bindex = bit_addr >> 6;
bitnumb = bit_addr % 64;
bitmap[bindex] |= (1L << bitnumb);
bit_addr++;
}
} else {
for (; nbits != 0; nbits--) {
bindex = bit_addr >> 6;
bitnumb = bit_addr % 64;
bitmap[bindex] &= ~(1L << bitnumb);
bit_addr++;
}
}
}
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