mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-01 11:52:47 +00:00
38 lines
730 B
C
38 lines
730 B
C
|
/*
|
||
|
|
* isinff(x) returns 1 if x is +-infinity, else 0;
|
||
|
|
*
|
||
|
|
* isinf is a <math.h> macro in the C99 standard. It was previously
|
||
|
|
* implemented as isinf and isinff functions by newlib and are still declared
|
||
|
|
* as such in <ieeefp.h>. Newlib supplies it here as a function if the user
|
||
|
|
* chooses to use <ieeefp.h> or needs to link older code compiled with the
|
||
|
|
* previous <math.h> declaration.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "fdlibm.h"
|
||
|
|
#include <ieeefp.h>
|
||
|
|
|
||
|
|
#undef isinff
|
||
|
|
|
||
|
|
int
|
||
|
|
_DEFUN (isinff, (x),
|
||
|
|
float x)
|
||
|
|
{
|
||
|
|
__int32_t ix;
|
||
|
|
GET_FLOAT_WORD(ix,x);
|
||
|
|
ix &= 0x7fffffff;
|
||
|
|
return FLT_UWORD_IS_INFINITE(ix);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef _DOUBLE_IS_32BITS
|
||
|
|
|
||
|
|
#undef isinf
|
||
|
|
|
||
|
|
int
|
||
|
|
_DEFUN (isinf, (x),
|
||
|
|
double x)
|
||
|
|
{
|
||
|
|
return isinff((float) x);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|