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/* Test of log() function. NaNs.
$Id: log-nan.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: log(x) --> NaN */
union lofl_u x;
} t[] = {
/* x is NaN */
{ { 0x7f800001 } },
{ { 0x7f800100 } },
{ { 0x7f810000 } },
{ { 0x7fc00000 } },
{ { 0x7fffffff } },
{ { 0xff800001 } },
{ { 0xff800100 } },
{ { 0xff810000 } },
{ { 0xffc00000 } },
{ { 0xffffffff } },
/* x < 0 */
{ { 0x80000001 } },
{ { 0x80000100 } },
{ { 0x80010000 } },
{ { 0x807fffff } },
{ { 0x80800000 } },
{ { 0xbf800000 } },
{ { 0xff7fffff } },
/* x = -Inf */
{ { 0xff800000 } },
};
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;
int i;
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
x.lo = pgm_read_dword (& t[i].x);
v.fl = log (x.fl);
if (!isnan(v.fl))
x_exit (i+1);
}
return 0;
}
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