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/* Test of copysign(). Both realizations are tested: inline and library.
$Id: copysign-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, y; /* args */
union lofl_u z; /* result */
} t[] = {
{ { .fl= +0.0 }, { .fl= +0.0 }, { .fl= +0.0 } },
{ { .fl= -0.0 }, { .fl= +0.0 }, { .fl= +0.0 } },
{ { .fl= +0.0 }, { .fl= -0.0 }, { .fl= -0.0 } },
{ { .fl= -0.0 }, { .fl= -0.0 }, { .fl= -0.0 } },
{ { .fl= +1 }, { .fl= +10 }, { .fl= +1 } },
{ { .fl= -1 }, { .fl= +10 }, { .fl= +1 } },
{ { .fl= +1 }, { .fl= -10 }, { .fl= -1 } },
{ { .fl= -1 }, { .fl= -10 }, { .fl= -1 } },
/* Inf */
{ { 0x7f800000 }, { 0xff800000 }, { 0xff800000 } },
{ { 0xff800000 }, { 0x7f800000 }, { 0x7f800000 } },
};
void x_exit (int index)
{
#ifndef __AVR__
fprintf (stderr, "t[%d]\n", index - 1);
#endif
exit (index ? index : -1);
}
int main ()
{
union lofl_u x, y, z;
int i;
double (* volatile vp) (double, double);
/* inline */
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
x.lo = pgm_read_dword (& t[i].x);
y.lo = pgm_read_dword (& t[i].y);
z.lo = pgm_read_dword (& t[i].z);
v.fl = copysign (x.fl, y.fl);
if (v.lo != z.lo)
x_exit (i + 1);
}
/* library function */
vp = copysign;
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
x.lo = pgm_read_dword (& t[i].x);
y.lo = pgm_read_dword (& t[i].y);
z.lo = pgm_read_dword (& t[i].z);
v.fl = vp (x.fl, y.fl);
if (v.lo != z.lo)
x_exit (i + 0x101);
}
return 0;
}
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