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/* Test of pow() function.
$Id: pow-02.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, y; /* args */
union lofl_u z; /* pow(x,y) */
} t[] = {
/* pow (0,0) */
{ { .fl= 0.0 }, { .fl= 0.0 }, { .fl= 1 } },
{ { .fl= -0.0 }, { .fl= 0.0 }, { .fl= 1 } },
{ { .fl= 0.0 }, { .fl= -0.0 }, { .fl= 1 } },
{ { .fl= -0.0 }, { .fl= -0.0 }, { .fl= 1 } },
/* pow (0, positive) */
{ { .fl= 0.0 }, { 0x00000001 }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { 0x007fffff }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { 0x00800000 }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { 0x7f7fffff }, { .fl= 0.0 } },
/* pow (0, negative) */
{ { .fl= 0.0 }, { 0x80000001 }, { 0x7f800000 } },
{ { .fl= 0.0 }, { 0x807fffff }, { 0x7f800000 } },
{ { .fl= 0.0 }, { 0x80800000 }, { 0x7f800000 } },
{ { .fl= 0.0 }, { 0xff7fffff }, { 0x7f800000 } },
/* pow (-0, +even) */
{ { .fl= -0.0 }, { .fl= 1 }, { .fl= -0.0 } },
/* pow (-0, +odd) */
{ { .fl= -0.0 }, { .fl= 2 }, { .fl= 0.0 } },
/* pow (-0, +nonintegral) */
{ { .fl= -0.0 }, { 0x00000001 }, { .fl= 0.0 } },
{ { .fl= -0.0 }, { 0x007fffff }, { .fl= 0.0 } },
{ { .fl= -0.0 }, { 0x00800000 }, { .fl= 0.0 } },
{ { .fl= -0.0 }, { 0x7f7fffff }, { .fl= 0.0 } },
/* pow (-0, +Inf) */
{ { .fl= -0.0 }, { 0x7f800000 }, { .fl= 0.0 } },
/* pow (-0, -even) */
{ { .fl= -0.0 }, { .fl= -1 }, { 0xff800000 } },
/* pow (-0, -odd) */
{ { .fl= -0.0 }, { .fl= -2 }, { 0x7f800000 } },
/* pow (-0, -nonintegral) */
{ { .fl= -0.0 }, { 0x80000001 }, { 0x7f800000 } },
{ { .fl= -0.0 }, { 0x807fffff }, { 0x7f800000 } },
{ { .fl= -0.0 }, { 0x80800000 }, { 0x7f800000 } },
{ { .fl= -0.0 }, { 0xff7fffff }, { 0x7f800000 } },
};
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,y,z;
int i;
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
y.lo = pgm_read_dword (& t[i].y);
x.lo = pgm_read_dword (& t[i].x);
z.lo = pgm_read_dword (& t[i].z);
v.fl = pow (x.fl, y.fl);
/* Comparison is integer to verify the zero sign. */
if (v.lo != z.lo)
x_exit (i+1);
}
return 0;
}
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