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[/] [openrisc/] [tags/] [gnu-src/] [newlib-1.18.0/] [newlib-1.18.0-or32-1.0rc2/] [newlib/] [libm/] [common/] [s_isnand.c] - Rev 520
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/* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ /* FUNCTION <<isnan>>, <<isnanf>>, <<isinf>>, <<isinff>>, <<finite>>, <<finitef>>---test for exceptional numbers INDEX isnan INDEX isinf INDEX finite INDEX isnanf INDEX isinff INDEX finitef ANSI_SYNOPSIS #include <ieeefp.h> int isnan(double <[arg]>); int isinf(double <[arg]>); int finite(double <[arg]>); int isnanf(float <[arg]>); int isinff(float <[arg]>); int finitef(float <[arg]>); TRAD_SYNOPSIS #include <ieeefp.h> int isnan(<[arg]>) double <[arg]>; int isinf(<[arg]>) double <[arg]>; int finite(<[arg]>); double <[arg]>; int isnanf(<[arg]>); float <[arg]>; int isinff(<[arg]>); float <[arg]>; int finitef(<[arg]>); float <[arg]>; DESCRIPTION These functions provide information on the floating-point argument supplied. There are five major number formats: o+ o zero A number which contains all zero bits. o subnormal A number with a zero exponent but a nonzero fraction. o normal A number with an exponent and a fraction. o infinity A number with an all 1's exponent and a zero fraction. o NAN A number with an all 1's exponent and a nonzero fraction. o- <<isnan>> returns 1 if the argument is a nan. <<isinf>> returns 1 if the argument is infinity. <<finite>> returns 1 if the argument is zero, subnormal or normal. Note that by the C99 standard, <<isnan>> and <<isinf>> are macros taking any type of floating-point and are declared in <<math.h>>. Newlib has chosen to declare these as macros in <<math.h>> and as functions in <<ieeefp.h>>. The <<isnanf>>, <<isinff>> and <<finitef>> functions perform the same operations as their <<isnan>>, <<isinf>> and <<finite>> counterparts, but on single-precision floating-point numbers. QUICKREF isnan - pure QUICKREF isinf - pure QUICKREF finite - pure QUICKREF isnan - pure QUICKREF isinf - pure QUICKREF finite - pure */ /* * __isnand(x) returns 1 is x is nan, else 0; * no branching! */ #include "fdlibm.h" #ifndef _DOUBLE_IS_32BITS int _DEFUN (__isnand, (x), double x) { __int32_t hx,lx; EXTRACT_WORDS(hx,lx,x); hx &= 0x7fffffff; hx |= (__uint32_t)(lx|(-lx))>>31; hx = 0x7ff00000 - hx; return (int)(((__uint32_t)(hx))>>31); } #endif /* _DOUBLE_IS_32BITS */