Hi,
On Mon, Jul 4, 2011 at 12:07 PM, Andrew Haley <aph@xxxxxxxxxx> wrote:
>
> It's not. Tey're wrong, you're right.
>
> Hope this helps. :-)
>
> Andrew.
>
What about this:
#include <math.h>
#define MASK ((unsigned short) 0x8000)
double copysign (double x, double y)
{
unsigned short * const py = (unsigned short*)(char*)&y + 3;
return fabs(x)*(*py&MASK?-1.0:1.0);
}
kevin
