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/* Test of conversion: unsigned long --> float
$Id: ulng2flt-01.c,v 1.1.2.1 2007/12/23 07:34:10 dmix Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include "progmem.h"
union lofl_u {
long lo;
float fl;
};
volatile union lofl_u v = { 1 };
PROGMEM const struct { /* Table of test cases: x, (float)x */
unsigned long x;
union lofl_u z;
} t[] = {
{ 0, { .fl = 0.0 } },
{ 10, { .fl = 1e+1 } },
{ 100, { .fl = 1e+2 } },
{ 1000, { .fl = 1e+3 } },
{ 10000, { .fl = 1e+4 } },
{ 100000, { .fl = 1e+5 } },
{ 1000000, { .fl = 1e+6 } },
{ 10000000, { .fl = 1e+7 } },
{ 100000000, { .fl = 1e+8 } },
{ 1000000000, { .fl = 1e+9 } },
{ 12, { .fl = 1.2e+1 } },
{ 123, { .fl = 1.23e+2 } },
{ 1234, { .fl = 1.234e+3 } },
{ 12345, { .fl = 1.2345e+4 } },
{ 123456, { .fl = 1.23456e+5 } },
{ 1234567, { .fl = 1.234567e+6 } },
{ 12345678, { .fl = 1.2345678e+7 } },
{ 123456780, { .fl = 1.2345678e+8 } },
{ 1234567800, { .fl = 1.2345678e+9 } },
/* max value */
{ 0xffffffff, { .fl = 0x1p+32 } },
/* all possible shifts */
{ 0x00000001, { .fl = 0x1p+00 } },
{ 0x00000002, { .fl = 0x1p+01 } },
{ 0x00000004, { .fl = 0x1p+02 } },
{ 0x00000008, { .fl = 0x1p+03 } },
{ 0x00000010, { .fl = 0x1p+04 } },
{ 0x00000020, { .fl = 0x1p+05 } },
{ 0x00000040, { .fl = 0x1p+06 } },
{ 0x00000080, { .fl = 0x1p+07 } },
{ 0x00000100, { .fl = 0x1p+08 } },
{ 0x00000200, { .fl = 0x1p+09 } },
{ 0x00000400, { .fl = 0x1p+10 } },
{ 0x00000800, { .fl = 0x1p+11 } },
{ 0x00001000, { .fl = 0x1p+12 } },
{ 0x00002000, { .fl = 0x1p+13 } },
{ 0x00004000, { .fl = 0x1p+14 } },
{ 0x00008000, { .fl = 0x1p+15 } },
{ 0x00010000, { .fl = 0x1p+16 } },
{ 0x00020000, { .fl = 0x1p+17 } },
{ 0x00040000, { .fl = 0x1p+18 } },
{ 0x00080000, { .fl = 0x1p+19 } },
{ 0x00100000, { .fl = 0x1p+20 } },
{ 0x00200000, { .fl = 0x1p+21 } },
{ 0x00400000, { .fl = 0x1p+22 } },
{ 0x00800000, { .fl = 0x1p+23 } },
{ 0x01000000, { .fl = 0x1p+24 } },
{ 0x02000000, { .fl = 0x1p+25 } },
{ 0x04000000, { .fl = 0x1p+26 } },
{ 0x08000000, { .fl = 0x1p+27 } },
{ 0x10000000, { .fl = 0x1p+28 } },
{ 0x20000000, { .fl = 0x1p+29 } },
{ 0x40000000, { .fl = 0x1p+30 } },
{ 0x80000000, { .fl = 0x1p+31 } },
/* bytes order */
{ 0x00000102, { .fl = 0x102p+00 } },
{ 0x00010203, { .fl = 0x10203p+00 } },
{ 0x01020304, { .fl = 0x1020304p+00 } },
/* rounding */
{ 0x01000000, { .fl = 0x0.800000p+25 } },
{ 0x01000001, { .fl = 0x0.800000p+25 } },
{ 0x01000002, { .fl = 0x0.800001p+25 } },
{ 0x01000003, { .fl = 0x0.800002p+25 } },
{ 0x01000004, { .fl = 0x0.800002p+25 } },
{ 0x01000005, { .fl = 0x0.800002p+25 } },
{ 0x01000006, { .fl = 0x0.800003p+25 } },
{ 0x01000007, { .fl = 0x0.800004p+25 } },
{ 0x80000000, { .fl = 0x0.800000p+32 } },
{ 0x80000001, { .fl = 0x0.800000p+32 } },
{ 0x8000007f, { .fl = 0x0.800000p+32 } },
{ 0x80000080, { .fl = 0x0.800000p+32 } },
{ 0x80000081, { .fl = 0x0.800001p+32 } },
{ 0x800000ff, { .fl = 0x0.800001p+32 } },
{ 0x80000100, { .fl = 0x0.800001p+32 } },
{ 0x80000101, { .fl = 0x0.800001p+32 } },
{ 0x8000017f, { .fl = 0x0.800001p+32 } },
{ 0x80000180, { .fl = 0x0.800002p+32 } },
{ 0x80000181, { .fl = 0x0.800002p+32 } },
{ 0x800001ff, { .fl = 0x0.800002p+32 } },
/* smart rounding in case of 0.5 (to even) */
{ 0x01000001, { .fl = 0x0.800000p+25 } },
{ 0x01000003, { .fl = 0x0.800002p+25 } },
{ 0x01000005, { .fl = 0x0.800002p+25 } },
{ 0x01000007, { .fl = 0x0.800004p+25 } },
{ 0x01000009, { .fl = 0x0.800004p+25 } },
{ 0x0100000b, { .fl = 0x0.800006p+25 } },
{ 0x0100000d, { .fl = 0x0.800006p+25 } },
{ 0x0100000f, { .fl = 0x0.800008p+25 } },
{ 0x01000011, { .fl = 0x0.800008p+25 } },
{ 0x01000013, { .fl = 0x0.80000ap+25 } },
{ 0x01000015, { .fl = 0x0.80000ap+25 } },
{ 0x01000017, { .fl = 0x0.80000cp+25 } },
{ 0x01000019, { .fl = 0x0.80000cp+25 } },
{ 0x0100001b, { .fl = 0x0.80000ep+25 } },
{ 0x0100001d, { .fl = 0x0.80000ep+25 } },
{ 0x0100001f, { .fl = 0x0.800010p+25 } },
{ 0x7ffffc40, { .fl = 0x0.fffff8p+31 } },
{ 0x7ffffcc0, { .fl = 0x0.fffffap+31 } },
{ 0x7ffffd40, { .fl = 0x0.fffffap+31 } },
{ 0x7ffffdc0, { .fl = 0x0.fffffcp+31 } },
{ 0x7ffffe40, { .fl = 0x0.fffffcp+31 } },
{ 0x7ffffec0, { .fl = 0x0.fffffep+31 } },
{ 0x7fffff40, { .fl = 0x0.fffffep+31 } },
{ 0x7fffffc0, { .fl = 0x1.000000p+31 } },
};
void x_exit (int index)
{
#ifndef __AVR__
fprintf (stderr, "t[%d]: %#lx\n", index - 1, v.lo);
#endif
exit (index ? index : -1);
}
int main ()
{
unsigned long x;
union lofl_u z;
int i;
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
x = pgm_read_dword (& t[i].x);
z.lo = pgm_read_dword (& t[i].z);
#ifdef __AVR__
/* Force library's convertion function usage. This is needed for
GCC before 4.2 */
extern double __floatunsisf (unsigned long);
v.fl = __floatunsisf (x);
#else
v.fl = x;
#endif
if (v.lo != z.lo)
x_exit (i+1);
}
return 0;
}
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