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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [math/] [modfq.c] - Rev 761
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/* s_modfl.c -- long double version of s_modf.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. * ==================================================== */ #include "quadmath-imp.h" static const __float128 one = 1.0; __float128 modfq (__float128 x, __float128 *iptr) { int64_t i0,i1,j0; uint64_t i; GET_FLT128_WORDS64(i0,i1,x); j0 = ((i0>>48)&0x7fff)-0x3fff; /* exponent of x */ if(j0<48) { /* integer part in high x */ if(j0<0) { /* |x|<1 */ /* *iptr = +-0 */ SET_FLT128_WORDS64(*iptr,i0&0x8000000000000000ULL,0); return x; } else { i = (0x0000ffffffffffffLL)>>j0; if(((i0&i)|i1)==0) { /* x is integral */ *iptr = x; /* return +-0 */ SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0); return x; } else { SET_FLT128_WORDS64(*iptr,i0&(~i),0); return x - *iptr; } } } else if (j0>111) { /* no fraction part */ *iptr = x*one; /* We must handle NaNs separately. */ if (j0 == 0x4000 && ((i0 & 0x0000ffffffffffffLL) | i1)) return x*one; /* return +-0 */ SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0); return x; } else { /* fraction part in low x */ i = -1ULL>>(j0-48); if((i1&i)==0) { /* x is integral */ *iptr = x; /* return +-0 */ SET_FLT128_WORDS64(x,i0&0x8000000000000000ULL,0); return x; } else { SET_FLT128_WORDS64(*iptr,i0,i1&(~i)); return x - *iptr; } } }
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