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/* Test of sqrt() function.
$Id: sqrt-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; /* argument */
union lofl_u z; /* sqrt(x) */
} t[] = {
/* zero */
{ { 0x00000000 }, { 0x00000000 } },
{ { 0x80000000 }, { 0x80000000 } }, /* sqrt(-0.0) --> -0.0 */
/* +Inf */
{ { 0x7f800000 }, { 0x7f800000 } },
/* some known values */
{ { .fl= 0.25 }, { .fl= 0.5 } },
{ { .fl= 1 }, { .fl= 1 } },
{ { .fl= 4 }, { .fl= 2 } },
{ { .fl= 9 }, { .fl= 3 } },
{ { .fl= 25 }, { .fl= 5 } },
{ { .fl= 49 }, { .fl= 7 } },
{ { .fl= 100 }, { .fl= 10 } },
{ { .fl= 121 }, { .fl= 11 } },
{ { .fl= 169 }, { .fl= 13 } },
{ { .fl= 10000 }, { .fl= 100 } },
{ { .fl= 1000000 }, { .fl= 1000 } },
/* subnormals */
{ { 0x00000001 }, { 0x1a3504f3 } },
{ { 0x00000002 }, { 0x1a800000 } },
{ { 0x00000003 }, { 0x1a9cc471 } },
{ { 0x00000080 }, { 0x1c000000 } },
{ { 0x00000100 }, { 0x1c3504f3 } },
{ { 0x00008000 }, { 0x1e000000 } },
{ { 0x00010000 }, { 0x1e3504f3 } },
{ { 0x00400000 }, { 0x1fb504f3 } },
{ { 0x007fffff }, { 0x1fffffff } },
/* margin values */
{ { 0x00800000 }, { 0x20000000 } },
{ { 0x00800001 }, { 0x20000000 } },
{ { 0x01000000 }, { 0x203504f3 } },
{ { 0x01000001 }, { 0x203504f4 } },
{ { 0x7f000000 }, { 0x5f3504f3 } },
{ { 0x7f000001 }, { 0x5f3504f4 } },
{ { 0x7f7ffffe }, { 0x5f7fffff } },
{ { 0x7f7fffff }, { 0x5f7fffff } },
/* rounding */
{ { .fl= 0x0.800001p+1 }, { .fl= 0x0.800000p+1 } },
{ { .fl= 0x0.800002p+1 }, { .fl= 0x0.800001p+1 } },
{ { .fl= 0x0.800003p+1 }, { .fl= 0x0.800001p+1 } },
{ { .fl= 0x0.800004p+1 }, { .fl= 0x0.800002p+1 } },
{ { .fl= 0x0.800005p+1 }, { .fl= 0x0.800002p+1 } },
{ { .fl= 0x0.800006p+1 }, { .fl= 0x0.800003p+1 } },
{ { .fl= 0x0.800007p+1 }, { .fl= 0x0.800003p+1 } },
{ { .fl= 0x0.800008p+1 }, { .fl= 0x0.800004p+1 } },
{ { .fl= 0x0.800009p+1 }, { .fl= 0x0.800004p+1 } },
};
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, z;
int i;
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
x.lo = pgm_read_dword (& t[i].x);
z.lo = pgm_read_dword (& t[i].z);
v.fl = sqrt (x.fl);
/* Comparison is integer to verify the zero sign. */
if (v.lo != z.lo)
x_exit (i+1);
}
return 0;
}
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