| 0,0 → 1,29 |
|---|
| /* |
| * isinf(x) returns 1 if x is infinity, else 0; |
| * no branching! |
| * |
| * isinf is a <math.h> macro in the C99 standard. It was previously |
| * implemented as a function by newlib and is 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> |
| |
| #ifndef _DOUBLE_IS_32BITS |
| |
| int |
| _DEFUN (isinf, (x), |
| double x) |
| { |
| __int32_t hx,lx; |
| EXTRACT_WORDS(hx,lx,x); |
| hx &= 0x7fffffff; |
| hx |= (__uint32_t)(lx|(-lx))>>31; |
| hx = 0x7ff00000 - hx; |
| return 1 - (int)((__uint32_t)(hx|(-hx))>>31); |
| } |
| |
| #endif /* _DOUBLE_IS_32BITS */ |