src/include/utils/float.h comment one link stable

hi.

src/include/utils/float.h

/*
* Routines to provide reasonably platform-independent handling of
* infinity and NaN
*
* We assume that isinf() and isnan() are available and work per spec.
* (On some platforms, we have to supply our own; see src/port.) However,
* generating an Infinity or NaN in the first place is less well standardized;
* pre-C99 systems tend not to have C99's INFINITY and NaN macros. We
* centralize our workarounds for this here.
*/

/*
* The funny placements of the two #pragmas is necessary because of a
* long lived bug in the Microsoft compilers.
* See http://support.microsoft.com/kb/120968/en-us for details
*/
#ifdef _MSC_VER
#pragma warning(disable:4756)
#endif
static inline float4
get_float4_infinity(void)
{
#ifdef INFINITY
/* C99 standard way */
return (float4) INFINITY;
#else
#ifdef _MSC_VER
#pragma warning(default:4756)
#endif
/*
* On some platforms, HUGE_VAL is an infinity, elsewhere it's just the
* largest normal float8. We assume forcing an overflow will get us a
* true infinity.
*/
return (float4) (HUGE_VAL * HUGE_VAL);
#endif
}

this link (http://support.microsoft.com/kb/120968/en-us) is stale.