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/* Test of fmod() function.
$Id: fmod-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, y; /* args */
union lofl_u z; /* fmod(x,y) */
} t[] = {
/* fmod(0,y) --> 0 */
{ { .fl= 0.0 }, { .fl= 1.0 }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { .fl= -1.0 }, { .fl= 0.0 } },
{ { .fl= -0.0 }, { .fl= 1.0 }, { .fl= -0.0 } },
{ { .fl= -0.0 }, { .fl= -1.0 }, { .fl= -0.0 } },
{ { .fl= 0.0 }, { 0x00000001 }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { 0x00000100 }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { 0x00010000 }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { 0x007fffff }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { 0x00800000 }, { .fl= 0.0 } },
{ { .fl= 0.0 }, { 0x7f7fffff }, { .fl= 0.0 } },
/* fmod(x,+Inf) --> x */
{ { 0x00000000 }, { 0x7f800000 }, { 0x00000000 } },
{ { 0x00000001 }, { 0x7f800000 }, { 0x00000001 } },
{ { 0x00000100 }, { 0x7f800000 }, { 0x00000100 } },
{ { 0x00010000 }, { 0x7f800000 }, { 0x00010000 } },
{ { 0x007fffff }, { 0x7f800000 }, { 0x007fffff } },
{ { 0x00800000 }, { 0x7f800000 }, { 0x00800000 } },
{ { 0x7f7fffff }, { 0x7f800000 }, { 0x7f7fffff } },
{ { 0x80000000 }, { 0x7f800000 }, { 0x80000000 } },
{ { 0x80000001 }, { 0x7f800000 }, { 0x80000001 } },
{ { 0x80000100 }, { 0x7f800000 }, { 0x80000100 } },
{ { 0x80010000 }, { 0x7f800000 }, { 0x80010000 } },
{ { 0x807fffff }, { 0x7f800000 }, { 0x807fffff } },
{ { 0x80800000 }, { 0x7f800000 }, { 0x80800000 } },
{ { 0xff7fffff }, { 0x7f800000 }, { 0xff7fffff } },
/* fmod(x,-Inf) --> x */
{ { 0x00000000 }, { 0xff800000 }, { 0x00000000 } },
{ { 0x00000001 }, { 0xff800000 }, { 0x00000001 } },
{ { 0x00000100 }, { 0xff800000 }, { 0x00000100 } },
{ { 0x00010000 }, { 0xff800000 }, { 0x00010000 } },
{ { 0x007fffff }, { 0xff800000 }, { 0x007fffff } },
{ { 0x00800000 }, { 0xff800000 }, { 0x00800000 } },
{ { 0x7f7fffff }, { 0xff800000 }, { 0x7f7fffff } },
{ { 0x80000000 }, { 0xff800000 }, { 0x80000000 } },
{ { 0x80000001 }, { 0xff800000 }, { 0x80000001 } },
{ { 0x80000100 }, { 0xff800000 }, { 0x80000100 } },
{ { 0x80010000 }, { 0xff800000 }, { 0x80010000 } },
{ { 0x807fffff }, { 0xff800000 }, { 0x807fffff } },
{ { 0x80800000 }, { 0xff800000 }, { 0x80800000 } },
{ { 0xff7fffff }, { 0xff800000 }, { 0xff7fffff } },
/* signs */
{ { .fl= 5 }, { .fl= 3 }, { .fl= 2 } },
{ { .fl= 5 }, { .fl= -3 }, { .fl= 2 } },
{ { .fl= -5 }, { .fl= 3 }, { .fl= -2 } },
{ { .fl= -5 }, { .fl= -3 }, { .fl= -2 } },
/* The smallest y */
{ { 0x00000001 }, { 0x00000001 }, { .fl= 0.0 } },
{ { 0x007fffff }, { 0x00000001 }, { .fl= 0.0 } },
{ { 0x00800000 }, { 0x00000001 }, { .fl= 0.0 } },
{ { 0x7f7fffff }, { 0x00000001 }, { .fl= 0.0 } },
/* Subnormals, all shift values */
{ { 0x00000001 }, { 0x00000001 }, { 0x00000000 } },
{ { 0x00000002 }, { 0x00000001 }, { 0x00000000 } },
{ { 0x00000004 }, { 0x00000003 }, { 0x00000001 } },
{ { 0x00000008 }, { 0x00000007 }, { 0x00000001 } },
{ { 0x00000010 }, { 0x0000000f }, { 0x00000001 } },
{ { 0x00000020 }, { 0x0000001f }, { 0x00000001 } },
{ { 0x00000040 }, { 0x0000003f }, { 0x00000001 } },
{ { 0x00000080 }, { 0x0000007f }, { 0x00000001 } },
{ { 0x00000100 }, { 0x000000ff }, { 0x00000001 } },
{ { 0x00000200 }, { 0x000001ff }, { 0x00000001 } },
{ { 0x00000400 }, { 0x000003ff }, { 0x00000001 } },
{ { 0x00000800 }, { 0x000007ff }, { 0x00000001 } },
{ { 0x00001000 }, { 0x00000fff }, { 0x00000001 } },
{ { 0x00002000 }, { 0x00001fff }, { 0x00000001 } },
{ { 0x00004000 }, { 0x00003fff }, { 0x00000001 } },
{ { 0x00008000 }, { 0x00007fff }, { 0x00000001 } },
{ { 0x00010000 }, { 0x0000ffff }, { 0x00000001 } },
{ { 0x00020000 }, { 0x0001ffff }, { 0x00000001 } },
{ { 0x00040000 }, { 0x0003ffff }, { 0x00000001 } },
{ { 0x00080000 }, { 0x0007ffff }, { 0x00000001 } },
{ { 0x00100000 }, { 0x000fffff }, { 0x00000001 } },
{ { 0x00200000 }, { 0x001fffff }, { 0x00000001 } },
{ { 0x00400000 }, { 0x003fffff }, { 0x00000001 } },
{ { 0x00800000 }, { 0x007fffff }, { 0x00000001 } },
{ { 0x00800001 }, { 0x007fffff }, { 0x00000002 } },
{ { 0x00800001 }, { 0x00800000 }, { 0x00000001 } },
};
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,y,z;
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);
z.lo = pgm_read_dword (& t[i].z);
v.fl = fmod (x.fl, y.fl);
/* Comparison is integer to verify the zero sign. */
if (v.lo != z.lo)
x_exit (i+1);
}
return 0;
}
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