NetBSD/regress/lib/libc/ldexp/ldexp.c

#include <math.h>
#include <stdio.h>

int
main()
{
	double v;
	int e;

#define	FORMAT	"%23.23lg\n"

	printf("basics:\n");
	v = 1.0; e = 5;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = 1022;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1023); e = -1;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = 1023;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1022); e = 1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1022); e = 2045;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = -5;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = -1021;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1022); e = 1;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = -1022;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1021); e = -1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1023); e = -2045;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1023); e = -1023;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1022); e = 1022;
	printf(FORMAT, ldexp(v, e));
	printf("\n");

	printf("zero:\n");
	v = 0.0; e = -1;
	printf(FORMAT, ldexp(v, e));
	v = 0.0; e = 0;
	printf(FORMAT, ldexp(v, e));
	v = 0.0; e = 1;
	printf(FORMAT, ldexp(v, e));
	v = 0.0; e = 1024;
	printf(FORMAT, ldexp(v, e));
	v = 0.0; e = 1025;
	printf(FORMAT, ldexp(v, e));
	v = 0.0; e = -1023;
	printf(FORMAT, ldexp(v, e));
	v = 0.0; e = -1024;
	printf(FORMAT, ldexp(v, e));
	printf("\n");

	printf("infinity:\n");
	v = ldexp(1.0, 1024); e = -1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1024); e = 0;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1024); e = 1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, 1024); e = -1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, 1024); e = 0;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, 1024); e = 1;
	printf(FORMAT, ldexp(v, e));
	printf("\n");

	printf("overflow:\n");
	v = 1.0; e = 1024;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1023); e = 1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1022); e = 2046;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = 1025;
	printf(FORMAT, ldexp(v, e));
	v = -1.0; e = 1024;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, 1023); e = 1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, -1022); e = 2046;
	printf(FORMAT, ldexp(v, e));
	v = -1.0; e = 1025;
	printf(FORMAT, ldexp(v, e));
	printf("\n");

	printf("denormal:\n");
	v = 1.0; e = -1023;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1022); e = -1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1023); e = -2046;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = -1024;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = -1074;
	printf(FORMAT, ldexp(v, e));
	v = -1.0; e = -1023;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, -1022); e = -1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, 1023); e = -2046;
	printf(FORMAT, ldexp(v, e));
	v = -1.0; e = -1024;
	printf(FORMAT, ldexp(v, e));
	v = -1.0; e = -1074;
	printf(FORMAT, ldexp(v, e));
	printf("\n");

	printf("underflow:\n");
	v = 1.0; e = -1075;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1074); e = -1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, 1023); e = -2098;
	printf(FORMAT, ldexp(v, e));
	v = 1.0; e = -1076;
	printf(FORMAT, ldexp(v, e));
	v = -1.0; e = -1075;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, -1074); e = -1;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(-1.0, 1023); e = -2098;
	printf(FORMAT, ldexp(v, e));
	v = -1.0; e = -1076;
	printf(FORMAT, ldexp(v, e));
	printf("\n");

	printf("denormal, large exponent:\n");
	v = ldexp(1.0, -1028); e = 1024;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1025;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1026;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1027;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1028;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1029;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1030;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1040;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1050;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1060;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1100;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1200;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1300;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1400;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1500;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1600;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1700;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1800;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 1900;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 2000;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 2046;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 2047;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 2048;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 2049;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 2050;
	printf(FORMAT, ldexp(v, e));
	v = ldexp(1.0, -1028); e = 2051;
	printf(FORMAT, ldexp(v, e));

	exit(0);
}