On Fri, Feb 11, 2011 at 11:16:55PM +0100, Stefan D?singer wrote:
> .... Its just that this function goes to great lengths to
> make sure it doesn't rely on the actual encoding that it is annoying that we
> have to give it up for detecting the sign of zeroes.
In that case why not?
int
is_neq_z(double x)
{
union {
char i[sizeof (double)];
double d;
} ux, u0;
int i;
if (x != 0.0)
return 0;
u0.d = 0.0;
ux.d = x;
for (i = 0; i < sizeof (double); i++) {
if (ux.i[i] != u0.i[i])
return 1;
}
return 0;
}
Which works provided that there are only 2 encoding patterns for zero.
David
--
David Laight: da...@l8s.co.uk
