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/* Test of float comparison, Inf.
$Id: cmp-02.c,v 1.1 2007/02/05 21:35:58 dmix Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include "progmem.h"
union lofl_u {
long lo;
float fl;
};
PROGMEM const struct { /* Table of test cases. */
union lofl_u x, y;
unsigned char ne; /* x != y */
unsigned char lt; /* x < y */
unsigned char le; /* x <= y */
unsigned char eq; /* x == y */
unsigned char ge; /* x >= y */
unsigned char gt; /* x > y */
} t[] = {
/* 0.0 and Inf, all signes */
{ { 0x00000000 }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x80000000 }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x00000000 }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x80000000 }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
/* nonzero and +Inf */
{ { 0xff7fffff }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x80800000 }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x807fffff }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x80000001 }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x00000001 }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x007fffff }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x00800000 }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x7f7fffff }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
/* nonzero and -Inf */
{ { 0xff7fffff }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x80800000 }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x807fffff }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x80000001 }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x00000001 }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x007fffff }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x00800000 }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x7f7fffff }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
/* +Inf and nonzero */
{ { 0x7f800000 }, { 0xff7fffff }, 1, 0, 0, 0, 1, 1 },
{ { 0x7f800000 }, { 0x80800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x7f800000 }, { 0x807fffff }, 1, 0, 0, 0, 1, 1 },
{ { 0x7f800000 }, { 0x80000001 }, 1, 0, 0, 0, 1, 1 },
{ { 0x7f800000 }, { 0x00000001 }, 1, 0, 0, 0, 1, 1 },
{ { 0x7f800000 }, { 0x007fffff }, 1, 0, 0, 0, 1, 1 },
{ { 0x7f800000 }, { 0x00800000 }, 1, 0, 0, 0, 1, 1 },
{ { 0x7f800000 }, { 0x7f7fffff }, 1, 0, 0, 0, 1, 1 },
/* -Inf and nonzero */
{ { 0xff800000 }, { 0xff7fffff }, 1, 1, 1, 0, 0, 0 },
{ { 0xff800000 }, { 0x80800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0xff800000 }, { 0x807fffff }, 1, 1, 1, 0, 0, 0 },
{ { 0xff800000 }, { 0x80000001 }, 1, 1, 1, 0, 0, 0 },
{ { 0xff800000 }, { 0x00000001 }, 1, 1, 1, 0, 0, 0 },
{ { 0xff800000 }, { 0x007fffff }, 1, 1, 1, 0, 0, 0 },
{ { 0xff800000 }, { 0x00800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0xff800000 }, { 0x7f7fffff }, 1, 1, 1, 0, 0, 0 },
/* Inf and Inf, all signes */
{ { 0x7f800000 }, { 0x7f800000 }, 0, 0, 1, 1, 1, 0 },
{ { 0xff800000 }, { 0xff800000 }, 0, 0, 1, 1, 1, 0 },
{ { 0xff800000 }, { 0x7f800000 }, 1, 1, 1, 0, 0, 0 },
{ { 0x7f800000 }, { 0xff800000 }, 1, 0, 0, 0, 1, 1 },
};
unsigned char cmpno = 255; /* to debug */
void x_exit (int index, unsigned char no)
{
#ifndef __AVR__
fprintf (stderr, "t[%d]: no= %d\n", index - 1, no);
#endif
cmpno = no;
exit (index ? index : -1);
}
volatile union lofl_u x, y;
int main ()
{
int i;
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);
if ((x.fl != y.fl) != pgm_read_byte (& t[i].ne))
x_exit (i+1, 1);
if ((x.fl < y.fl) != pgm_read_byte (& t[i].lt))
x_exit (i+1, 2);
if ((x.fl <= y.fl) != pgm_read_byte (& t[i].le))
x_exit (i+1, 3);
if ((x.fl == y.fl) != pgm_read_byte (& t[i].eq))
x_exit (i+1, 4);
if ((x.fl >= y.fl) != pgm_read_byte (& t[i].ge))
x_exit (i+1, 5);
if ((x.fl > y.fl) != pgm_read_byte (& t[i].gt))
x_exit (i+1, 6);
}
return 0;
}
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