long double
printf_frexpl (long double x, int *expptr)
{
return printf_frexp (x, expptr);
}
int
main ()
{
int i;
/* The use of 'volatile' guarantees that excess precision bits are dropped
when dealing with denormalized numbers. It is necessary on x86 systems
where double-floats are not IEEE compliant by default, to avoid that the
results become platform and compiler option dependent. 'volatile' is a
portable alternative to gcc's -ffloat-store option. */
volatile double x;
for (i = 1, x = 1.0; i <= DBL_MAX_EXP; i++, x *= 2.0)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.0);
}
for (i = 1, x = 1.0; i >= DBL_MIN_EXP; i--, x *= 0.5)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.0);
}
for (; i >= DBL_MIN_EXP - 100 && x > 0.0; i--, x *= 0.5)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == DBL_MIN_EXP - 1);
ASSERT (mantissa == my_ldexp (1.0, i - DBL_MIN_EXP));
}
for (i = 1, x = 1.01; i <= DBL_MAX_EXP; i++, x *= 2.0)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.01);
}
for (i = 1, x = 1.01; i >= DBL_MIN_EXP; i--, x *= 0.5)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.01);
}
for (; i >= DBL_MIN_EXP - 100 && x > 0.0; i--, x *= 0.5)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == DBL_MIN_EXP - 1);
ASSERT (mantissa >= my_ldexp (1.0, i - DBL_MIN_EXP));
ASSERT (mantissa <= my_ldexp (2.0, i - DBL_MIN_EXP));
ASSERT (mantissa == my_ldexp (x, - exp));
}
for (i = 1, x = 1.73205; i <= DBL_MAX_EXP; i++, x *= 2.0)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.73205);
}
for (i = 1, x = 1.73205; i >= DBL_MIN_EXP; i--, x *= 0.5)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == i - 1);
ASSERT (mantissa == 1.73205);
}
for (; i >= DBL_MIN_EXP - 100 && x > 0.0; i--, x *= 0.5)
{
int exp = -9999;
double mantissa = printf_frexp (x, &exp);
ASSERT (exp == DBL_MIN_EXP - 1);
ASSERT (mantissa >= my_ldexp (1.0, i - DBL_MIN_EXP));
ASSERT (mantissa <= my_ldexp (2.0, i - DBL_MIN_EXP));
ASSERT (mantissa == my_ldexp (x, - exp));
}
return 0;
}