greenplumn isinf 源码
greenplumn isinf 代码
文件路径：/src/port/isinf.c
/*-------------------------------------------------------------------------
*
* isinf.c
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/port/isinf.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#include <float.h>
#include <math.h>
#if HAVE_FPCLASS /* this is _not_ HAVE_FP_CLASS, and not typo */
#if HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
int
isinf(double d)
{
fpclass_t type = fpclass(d);
switch (type)
{
case FP_NINF:
case FP_PINF:
return 1;
default:
break;
}
return 0;
}
#else
#if defined(HAVE_FP_CLASS) || defined(HAVE_FP_CLASS_D)
#if HAVE_FP_CLASS_H
#include <fp_class.h>
#endif
int
isinf(double x)
{
#if HAVE_FP_CLASS
int fpclass = fp_class(x);
#else
int fpclass = fp_class_d(x);
#endif
if (fpclass == FP_POS_INF)
return 1;
if (fpclass == FP_NEG_INF)
return -1;
return 0;
}
#elif defined(HAVE_CLASS)
int
isinf(double x)
{
int fpclass = class(x);
if (fpclass == FP_PLUS_INF)
return 1;
if (fpclass == FP_MINUS_INF)
return -1;
return 0;
}
#endif
#endif
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