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/* Test of log10() function.
$Id: log10-01.c,v 1.1 2007/02/05 21:35:58 dmix Exp $
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "progmem.h"
union lofl_u {
long lo;
float fl;
};
volatile union lofl_u v = { .lo = 1 };
PROGMEM const struct { /* Table of test cases: x, log10(x) */
union lofl_u x, z;
} t[] = {
/* log10(0) */
{ { 0x00000000 }, { 0xff800000 } },
{ { 0x80000000 }, { 0xff800000 } }, /* -0.0 is legal arg. */
/* log(+Inf) */
{ { 0x7f800000 }, { 0x7f800000 } },
{ { .fl = 0.01 }, { .fl = -2 } },
{ { .fl = 0.1 }, { .fl = -1 } },
{ { .fl = 1 }, { .fl = 0 } },
{ { .fl = 10 }, { .fl = 1 } },
{ { .fl = 100 }, { .fl = 2 } },
};
void x_exit (int index)
{
#ifndef __AVR__
fprintf (stderr, "t[%d]: %#lx\n", index - 1, v.lo);
#endif
exit (index ? index : -1);
}
int main ()
{
union lofl_u x, z;
int i;
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
x.lo = pgm_read_dword (& t[i].x);
z.lo = pgm_read_dword (& t[i].z);
v.fl = log10 (x.fl);
/* Comparison is integer to verify the zero sign. */
if (v.lo != z.lo)
x_exit (i+1);
}
return 0;
}
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