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/* Test of exp() function.
$Id: exp-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. */
union lofl_u x; /* argument */
union lofl_u z; /* exp(x) */
} t[] = {
/* Zero */
{ { .fl= 0.0 }, { .fl= 1 } },
{ { .fl= -0.0 }, { .fl= 1 } },
/* Inf */
{ { 0x7f800000 }, { 0x7f800000 } },
{ { 0xff800000 }, { 0x00000000 } },
/* Subnormal */
{ { 0x00000001 }, { .fl= 1 } },
{ { 0x00000100 }, { .fl= 1 } },
{ { 0x00010000 }, { .fl= 1 } },
{ { 0x007fffff }, { .fl= 1 } },
{ { 0x80000001 }, { .fl= 1 } },
{ { 0x80000100 }, { .fl= 1 } },
{ { 0x80010000 }, { .fl= 1 } },
{ { 0x807fffff }, { .fl= 1 } },
/* Arg too small */
{ { 0xc3000000 }, { .fl= 0 } },
{ { 0xc3800000 }, { .fl= 0 } },
{ { 0xc3ffffff }, { .fl= 0 } },
{ { 0xc4000000 }, { .fl= 0 } },
{ { 0xff7fffff }, { .fl= 0 } },
/* Some values */
{ { .fl= 1.0 }, { 0x402df854 } },
{ { .fl= -1.0 }, { 0x3ebc5ab2 } },
/* Near 0.0 */
{ { .fl= 0x0.000002p0 }, { .fl= 0x1.000002p0 } },
{ { .fl= 0x0.000004p0 }, { .fl= 0x1.000004p0 } },
{ { .fl= 0x0.000006p0 }, { .fl= 0x1.000006p0 } },
{ { .fl= 0x0.000010p0 }, { .fl= 0x1.000010p0 } },
{ { .fl= 0x0.000100p0 }, { .fl= 0x1.000100p0 } },
{ { .fl= 0x0.000800p0 }, { .fl= 0x1.000800p0 } },
{ { .fl= -0x0.000001p0 }, { .fl= 0x0.ffffffp0 } },
{ { .fl= -0x0.000002p0 }, { .fl= 0x0.fffffep0 } },
{ { .fl= -0x0.000003p0 }, { .fl= 0x0.fffffdp0 } },
{ { .fl= -0x0.000010p0 }, { .fl= 0x0.fffff0p0 } },
{ { .fl= -0x0.000100p0 }, { .fl= 0x0.ffff00p0 } },
{ { .fl= -0x0.001000p0 }, { .fl= 0x0.fff000p0 } },
};
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 = exp (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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