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/* Test of fdim() function.
$Id: fdim-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[] = {
/* fdim (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= 0.0 } },
/* fdim (Inf,Inf) */
#ifdef __AVR__
/* gcc 3.2.2 with glibc 2.3.1: fdim(Inf,Inf) --> NaN
gcc 3.4.5 with glibc 2.3.6: fdim(Inf,Inf) --> 0 (?) */
{ { 0x7f800000 }, { 0x7f800000 }, { 0x7fc00000 } }, /* --> NaN */
{ { 0xff800000 }, { 0xff800000 }, { 0x7fc00000 } }, /* --> NaN */
#endif
{ { 0x7f800000 }, { 0xff800000 }, { 0x7f800000 } },
{ { 0xff800000 }, { 0x7f800000 }, { 0x00000000 } },
/* x == y */
{ { 0xff7fffff }, { 0xff7fffff }, { 0x00000000 } },
{ { 0x80000001 }, { 0x80000001 }, { 0x00000000 } },
{ { 0x00000001 }, { 0x00000001 }, { 0x00000000 } },
{ { 0x7f7fffff }, { 0x7f7fffff }, { 0x00000000 } },
/* x > y */
{ { 0xff7ffffe }, { 0xff7fffff }, { 0x73800000 } },
{ { 0x00000001 }, { 0x80000001 }, { 0x00000002 } },
{ { 0x7f7fffff }, { 0xff7fffff }, { 0x7f800000 } }, /* --> +Inf */
{ { 0x7f7fffff }, { 0x7f7ffffe }, { 0x73800000 } },
{ { .fl= 10 }, { .fl= 8 }, { .fl= 2 } },
{ { .fl= 10 }, { .fl= -8 }, { .fl= 18 } },
{ { .fl= 10 }, { .fl= -12 }, { .fl= 22 } },
/* x < y */
{ { 0xff7fffff }, { 0xff7ffffe }, { 0 } },
{ { 0x7f7ffffe }, { 0x7f7fffff }, { 0 } },
{ { 0xff7fffff }, { 0x7f7fffff }, { 0 } },
/* NaN */
{ { 0x7f800001 }, { 0x7f000000 }, { 0x7f8c0000 } },
{ { 0x7f800100 }, { 0x7f000000 }, { 0x7f8c0000 } },
{ { 0x7f810000 }, { 0x7f000000 }, { 0x7f8c0000 } },
{ { 0x7fc00000 }, { 0x7f000000 }, { 0x7f8c0000 } },
{ { 0x7fffffff }, { 0x7f000000 }, { 0x7f8c0000 } },
{ { 0xff700000 }, { 0xff800001 }, { 0x7f8c0000 } },
{ { 0x7f800100 }, { 0x7f800200 }, { 0x7f8c0000 } },
};
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 = fdim (x.fl, y.fl);
if ( v.lo == z.lo
|| (isnan(v.fl) && isnan(z.fl)) )
continue;
x_exit (i+1);
}
return 0;
}
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