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/* Test of ldexp function. Without NaNs.
$Id: ldexp-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;
int y;
union lofl_u z; /* z = ldexp(x,y) */
} t[] = {
/* x == 0 */
{ { 0 }, 0, { 0 } },
{ { 0 }, 1, { 0 } },
{ { 0 }, -1, { 0 } },
{ { 0 }, 32767, { 0 } },
{ { 0 }, -32768, { 0 } },
{ { 0x80000000 }, 0, { 0x80000000 } },
{ { 0x80000000 }, -1, { 0x80000000 } },
/* normal --> normal */
{ { .fl = 1. }, 0, { .fl = 1. } },
{ { .fl = 1. }, 1, { .fl = 2. } },
{ { .fl = 1. }, -1, { .fl = .5 } },
{ { .fl = 1. }, 127, { 0x7f000000 } },
{ { .fl = 1. }, -126, { 0x00800000 } },
{ { .fl = -1. }, 0, { .fl = -1. } },
{ { .fl = -1. }, 1, { .fl = -2. } },
{ { .fl = -1. }, -1, { .fl = -.5 } },
{ { .fl = -1. }, 127, { 0xff000000 } },
{ { .fl = -1. }, -126, { 0x80800000 } },
/* normal --> subnormal */
{ { .fl = 1. }, -127, { 0x00400000 } },
{ { .fl = 1. }, -149, { 0x00000001 } },
{ { .fl = -1. }, -127, { 0x80400000 } },
{ { .fl = -1. }, -149, { 0x80000001 } },
/* subnormal <<= N */
{ { 0x00000001 }, 0, { 0x00000001 } },
{ { 0x00000001 }, 1, { 0x00000002 } },
{ { 0x00000001 }, 2, { 0x00000004 } },
{ { 0x00000001 }, 22, { 0x00400000 } },
{ { 0x00000001 }, 23, { 0x00800000 } },
{ { 0x00000001 }, 24, { 0x01000000 } },
{ { 0x00000001 }, 25, { 0x01800000 } },
{ { 0x00000001 }, 149, { 0x3f800000 } },
{ { 0x00000001 }, 276, { 0x7f000000 } },
{ { 0x00000001 }, 277, { 0x7f800000 } }, /* overflow */
/* subnormal >>= N */
{ { 0x00400000 }, 0, { 0x00400000 } },
{ { 0x00400000 }, -1, { 0x00200000 } },
{ { 0x00400000 }, -2, { 0x00100000 } },
{ { 0x00400000 }, -22, { 0x00000001 } },
{ { 0x00400000 }, -23, { 0x00000000 } }, /* round to 0 */
{ { 0x00400000 }, -2000, { 0x00000000 } }, /* underflow */
/* underflow */
{ { .fl = 1. }, -151, { 0 } },
{ { .fl = -1. }, -151, { 0x80000000 } },
/* overflow */
{ { .fl = 1. }, 128, { 0x7f800000 } },
{ { .fl = -1. }, 128, { 0xff800000 } },
{ { .fl = 1. }, 32767-127, { 0x7f800000 } },
{ { .fl = -1. }, 32767-127, { 0xff800000 } },
/* Infinity */
{ { 0x7f800000 }, 0, { 0x7f800000 } },
{ { 0x7f800000 }, 1, { 0x7f800000 } },
{ { 0x7f800000 }, -1, { 0x7f800000 } },
{ { 0x7f800000 }, 32767, { 0x7f800000 } },
{ { 0x7f800000 }, -32768, { 0x7f800000 } },
{ { 0xff800000 }, 0, { 0xff800000 } },
{ { 0xff800000 }, 1, { 0xff800000 } },
{ { 0xff800000 }, -1, { 0xff800000 } },
{ { 0xff800000 }, 32767, { 0xff800000 } },
{ { 0xff800000 }, -32768, { 0xff800000 } },
/* Rounding */
{ { 0x00000001 }, -1, { 0x00000000 } },
{ { 0x00000003 }, -1, { 0x00000002 } },
{ { 0x00000005 }, -1, { 0x00000002 } },
{ { 0x00000007 }, -1, { 0x00000004 } },
{ { 0x00000009 }, -1, { 0x00000004 } },
{ { 0x0000000b }, -1, { 0x00000006 } },
{ { 0x0000000d }, -1, { 0x00000006 } },
{ { 0x0000000f }, -1, { 0x00000008 } },
{ { 0x00000011 }, -1, { 0x00000008 } },
{ { 0x00000100 }, -9, { 0x00000000 } },
{ { 0x00000101 }, -9, { 0x00000001 } },
{ { 0x00010001 }, -17, { 0x00000001 } },
{ { 0x00800001 }, -24, { 0x00000001 } },
{ { 0x01800001 }, -26, { 0x00000001 } },
{ { 0x00000101 }, -10, { 0x00000000 } },
};
void x_exit (int index)
{
#ifndef __AVR__
fprintf (stderr, "t[%d]: %e (%#lx)\n", index - 1, v.fl, v.lo);
#endif
exit (index ? index : -1);
}
int main ()
{
union lofl_u x, z;
int y;
int i;
for (i = 0; i < (int) (sizeof(t) / sizeof(t[0])); i++) {
x.lo = pgm_read_dword (& t[i].x);
y = pgm_read_word (& t[i].y);
z.lo = pgm_read_dword (& t[i].z);
v.fl = ldexp (x.fl, y);
/* Comparison is integer to verify zero sign. */
if (v.lo != z.lo)
x_exit (i+1);
}
return 0;
}
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