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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [ilogbq.c] - Rev 776
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/* s_ilogbl.c -- long double version of s_ilogb.c. * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. */ /* * ==================================================== * 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. * ==================================================== */ #if defined(LIBM_SCCS) && !defined(lint) static char rcsid[] = "$NetBSD: $"; #endif /* ilogbl(long double x) * return the binary exponent of non-zero x * ilogbl(0) = FP_ILOGB0 * ilogbl(NaN) = FP_ILOGBNAN (no signal is raised) * ilogbl(+-Inf) = INT_MAX (no signal is raised) */ #include <limits.h> #include <math.h> #include "quadmath-imp.h" #ifndef FP_ILOGB0 # define FP_ILOGB0 INT_MIN #endif #ifndef FP_ILOGBNAN # define FP_ILOGBNAN INT_MAX #endif int ilogbq (__float128 x) { int64_t hx,lx; int ix; GET_FLT128_WORDS64(hx,lx,x); hx &= 0x7fffffffffffffffLL; if(hx <= 0x0001000000000000LL) { if((hx|lx)==0) return FP_ILOGB0; /* ilogbl(0) = FP_ILOGB0 */ else /* subnormal x */ if(hx==0) { for (ix = -16431; lx>0; lx<<=1) ix -=1; } else { for (ix = -16382, hx<<=15; hx>0; hx<<=1) ix -=1; } return ix; } else if (hx<0x7fff000000000000LL) return (hx>>48)-0x3fff; else if (FP_ILOGBNAN != INT_MAX) { /* ISO C99 requires ilogbl(+-Inf) == INT_MAX. */ if (((hx^0x7fff000000000000LL)|lx) == 0) return INT_MAX; } return FP_ILOGBNAN; }
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