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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"
#include "emfloat.h"
/*****************************
** FLOATING-POINT EMULATION **
*****************************/
/*
** The following constant is the maximum number of loops
** of the emulated floating point test that the system
** will allow before flagging an error. This is not a
** critical constant, and can be altered if your system is
** a real barn-burner.
*/
#define LOOP_MAX 500000L
#define ARRAY_SIZE 3000
static clock_t DoEmFloatIteration(InternalFPF *abase, InternalFPF *bbase, InternalFPF *cbase,
unsigned long loops);
static void SetupCPUEmFloatArrays(InternalFPF *abase, InternalFPF *bbase);
/**************
** DoEmFloat **
***************
** Perform the floating-point emulation routines portion of the
** CPU benchmark. Returns the operations per second.
*/
double
DoEmFloat(void)
{
InternalFPF* abase = NULL;
InternalFPF* bbase = NULL;
InternalFPF* cbase = NULL;
clock_t total_time = 0;
int iterations = 0;
static bool is_adjusted = false;
static long loops = 1;
abase = malloc(ARRAY_SIZE * sizeof(InternalFPF));
bbase = malloc(ARRAY_SIZE * sizeof(InternalFPF));
cbase = malloc(ARRAY_SIZE * sizeof(InternalFPF));
SetupCPUEmFloatArrays(abase, bbase); /* FIXME: ugly */
/* See if we need to do self-adjusting code.*/
if (is_adjusted == false) {
is_adjusted = true;
/*
** Do an iteration of the tests. If the elapsed time is
** less than minimum, increase the loop count and try
** again.
*/
do {
loops += loops;
} while ((DoEmFloatIteration(abase, bbase, cbase, loops) <= MINIMUM_TICKS) && (loops < LOOP_MAX));
}
/*
** Verify that selft adjustment code worked.
*/
if (loops == 0) {
fputs("CPU:EMFPU -- CMPUEMFLOATLOOPMAX limit hit", stderr);
free(abase);
free(bbase);
free(cbase);
exit(1);
}
/*
** All's well if we get here. Repeatedly perform floating
** tests until the accumulated time is greater than the
** # of seconds requested.
** Each iteration performs ARRAY_SIZE * 3 operations.
*/
do {
total_time += DoEmFloatIteration(abase, bbase, cbase, loops);
++iterations;
} while (total_time < MINIMUM_SECONDS * CLOCKS_PER_SEC);
free(abase);
free(bbase);
free(cbase);
return (double)(iterations * loops * CLOCKS_PER_SEC) / (double)total_time;
}
/***********************
** DoEmFloatIteration **
************************
** Perform an iteration of the emulated floating-point
** benchmark. Note that "an iteration" can involve multiple
** loops through the benchmark.
*/
static clock_t
DoEmFloatIteration(InternalFPF *abase,
InternalFPF *bbase,
InternalFPF *cbase,
unsigned long loops)
{
clock_t start, stop;
static unsigned char jtable[16] = {0,0,0,0,1,1,1,1,2,2,2,2,2,3,3,3};
unsigned long i;
start = clock();
/*
** Each pass through the array performs operations in
** the followingratios:
** 4 adds, 4 subtracts, 5 multiplies, 3 divides
** (adds and subtracts being nearly the same operation)
*/
while(loops--)
{
for(i=0;i<ARRAY_SIZE;i++)
switch(jtable[i % 16])
{
case 0: /* Add */
AddSubInternalFPF(0,abase+i,
bbase+i,
cbase+i);
break;
case 1: /* Subtract */
AddSubInternalFPF(1,abase+i,
bbase+i,
cbase+i);
break;
case 2: /* Multiply */
MultiplyInternalFPF(abase+i,
bbase+i,
cbase+i);
break;
case 3: /* Divide */
DivideInternalFPF(abase+i,
bbase+i,
cbase+i);
break;
}
}
stop = clock();
return stop - start;
}
/**************************
** SetupCPUEmFloatArrays **
***************************
** Set up the arrays that will be used in the emulated
** floating-point tests.
** This is done by loading abase and bbase elements with
** random numbers. We use our long-to-floating point
** routine to set them up.
*/
static void
SetupCPUEmFloatArrays(InternalFPF *abase, InternalFPF *bbase)
{
unsigned long i;
InternalFPF locFPF1,locFPF2;
/*
** Reset random number generator so things repeat. Inserted by Uwe F. Mayer.
*/
randnum(13);
for (i = 0; i < ARRAY_SIZE; i++) {
Int32ToInternalFPF(randwc(50000),&locFPF1);
Int32ToInternalFPF(randwc(50000)+1,&locFPF2);
DivideInternalFPF(&locFPF1,&locFPF2,abase+i);
Int32ToInternalFPF(randwc(50000)+1,&locFPF2);
DivideInternalFPF(&locFPF1,&locFPF2,bbase+i);
}
}
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