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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [common/] [s_isinf.c] - Rev 179
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/* * 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 */
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