Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> writes:
> I am now generating NAN by:
>
> double x;
>
> return (x-x)/(x-x);
>
> This seems to be the way my libm math library does it. The gcc2 -O4
> compile does not seem to optimize it away, so looks like it will work.
> My guess is that the compiler can not optimize floating-point
> computations.
Thanks for the follow-up. Suggestion:
At the top of numeric.c or in include/utils/numeric.h, put
#ifndef NAN
#define pgNAN (0.0/0.0)
#endif
Then in numeric.c, if NAN isn't defined,
return pgNAN;
--
Hal