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/* Test of conversion float --> unsigned long.
$Id: flt2ulng-01.c,v 1.2 2007/12/01 02:12:55 dmix Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include "progmem.h"
union lofl_u {
long lo;
float fl;
};
volatile unsigned long v = 1;
PROGMEM const struct { /* Table of test cases. */
union lofl_u x;
unsigned long z;
} t[] = {
/* 0.0 */
{ { 0x00000000 }, 0 },
{ { 0x80000000 }, 0 },
/* too small */
{ { 0x00000001 }, 0 },
{ { 0x007fffff }, 0 },
{ { 0x00800000 }, 0 },
{ { 0x3f7fffff }, 0 },
{ { 0x80000001 }, 0 },
{ { 0x807fffff }, 0 },
{ { 0x80800000 }, 0 },
{ { 0xbf7fffff }, 0 },
/* all shift values */
{ { .fl = 0x1p00 }, 0x00000001 },
{ { .fl = 0x1p01 }, 0x00000002 },
{ { .fl = 0x1p02 }, 0x00000004 },
{ { .fl = 0x1p03 }, 0x00000008 },
{ { .fl = 0x1p04 }, 0x00000010 },
{ { .fl = 0x1p05 }, 0x00000020 },
{ { .fl = 0x1p06 }, 0x00000040 },
{ { .fl = 0x1p07 }, 0x00000080 },
{ { .fl = 0x1p08 }, 0x00000100 },
{ { .fl = 0x1p09 }, 0x00000200 },
{ { .fl = 0x1p10 }, 0x00000400 },
{ { .fl = 0x1p11 }, 0x00000800 },
{ { .fl = 0x1p12 }, 0x00001000 },
{ { .fl = 0x1p13 }, 0x00002000 },
{ { .fl = 0x1p14 }, 0x00004000 },
{ { .fl = 0x1p15 }, 0x00008000 },
{ { .fl = 0x1p16 }, 0x00010000 },
{ { .fl = 0x1p17 }, 0x00020000 },
{ { .fl = 0x1p18 }, 0x00040000 },
{ { .fl = 0x1p19 }, 0x00080000 },
{ { .fl = 0x1p20 }, 0x00100000 },
{ { .fl = 0x1p21 }, 0x00200000 },
{ { .fl = 0x1p22 }, 0x00400000 },
{ { .fl = 0x1p23 }, 0x00800000 },
{ { .fl = 0x1p24 }, 0x01000000 },
{ { .fl = 0x1p25 }, 0x02000000 },
{ { .fl = 0x1p26 }, 0x04000000 },
{ { .fl = 0x1p27 }, 0x08000000 },
{ { .fl = 0x1p28 }, 0x10000000 },
{ { .fl = 0x1p29 }, 0x20000000 },
{ { .fl = 0x1p30 }, 0x40000000 },
{ { .fl = 0x1p31 }, 0x80000000 },
/* max value */
{ { .fl = 0x1.fffffep+31 }, 0xffffff00 },
/* rounding (trunc to zero) */
{ { 0x3f7fffff }, 0 },
{ { 0x3f800000 }, 1 },
{ { 0x3fffffff }, 1 },
{ { 0x40000000 }, 2 },
{ { 0x403fffff }, 2 },
{ { 0x40400000 }, 3 },
{ { 0x407fffff }, 3 },
{ { .fl = 0x1.000000p+22 }, 0x00400000 },
{ { .fl = 0x1.000002p+22 }, 0x00400000 },
/* This realization permits negative input, like GCC/x86. */
{ { .fl = -0.5 }, 0 },
{ { .fl = -1 }, 0xffffffff },
{ { .fl = -2 }, 0xfffffffe },
{ { .fl = -0x0.7fffffp+32 }, 0x80000100 },
{ { .fl = -0x0.800000p+32 }, 0x80000000 },
{ { .fl = -0x0.800001p+32 }, 0x7fffff00 },
{ { .fl = -0x0.fffffep+32 }, 0x00000200 },
{ { .fl = -0x0.ffffffp+32 }, 0x00000100 },
{ { .fl = -0x0.800000p+33 }, 0 }, /* overflow */
/* Very big numbers (positive and negative). */
{ { .fl = 0x0.800000p+56 }, 0 },
{ { .fl = 0x0.ffffffp+56 }, 0 },
{ { .fl = 0x0.800000p+57 }, 0 },
{ { .fl = 0x0.ffffffp+57 }, 0 },
{ { 0x7f000000 }, 0 },
{ { 0x7f7fffff }, 0 },
{ { .fl = -0x0.800000p+56 }, 0 },
{ { .fl = -0x0.ffffffp+56 }, 0 },
{ { .fl = -0x0.800000p+57 }, 0 },
{ { .fl = -0x0.ffffffp+57 }, 0 },
{ { 0xff000000 }, 0 },
{ { 0xff7fffff }, 0 },
/* Inf */
{ { 0x7f800000 }, 0 },
{ { 0xff800000 }, 0 },
/* NaN */
{ { 0x7f800001 }, 0 },
{ { 0x7fc00000 }, 0 },
{ { 0x7fffffff }, 0 },
{ { 0xff800001 }, 0 },
{ { 0xffc00000 }, 0 },
{ { 0xffffffff }, 0 },
#ifdef __AVR__
/* Unlike to GCC/x86 this realization does not shifts value
in overflow case. So with not too big numbers the results
are different. */
/* Positive overflow */
{ { .fl= 0x0.800000p+33 }, 0 },
{ { .fl= 0x0.800001p+33 }, 0 },
{ { .fl= 0x0.ffffffp+33 }, 0 },
{ { .fl= 0x0.800000p+34 }, 0 },
{ { .fl= 0x0.ffffffp+34 }, 0 },
{ { .fl= 0x0.800000p+55 }, 0 },
{ { .fl= 0x0.ffffffp+55 }, 0 },
/* Negative overflow */
{ { .fl= -0x0.800000p+33 }, 0 }, /* no overflow */
{ { .fl= -0x0.800001p+33 }, 0 },
{ { .fl= -0x0.ffffffp+33 }, 0 },
{ { .fl= -0x0.800000p+34 }, 0 },
{ { .fl= -0x0.ffffffp+34 }, 0 },
{ { .fl= -0x0.800000p+55 }, 0 },
{ { .fl= -0x0.ffffffp+55 }, 0 },
#endif
};
void x_exit (int index)
{
#ifndef __AVR__
fprintf (stderr, "t[%d]: %lu (%#lx)\n", index - 1, v, v);
#endif
exit (index ? index : -1);
}
int main ()
{
union lofl_u x;
unsigned long z;
int i;
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
x.lo = pgm_read_dword (& t[i].x);
z = pgm_read_dword (& t[i].z);
v = x.fl;
if (v != z)
x_exit (i+1);
}
return 0;
}
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