/* IEEE754 floating point arithmetic * double precision: common utilities */ /* * MIPS floating point support * Copyright (C) 1994-2000 Algorithmics Ltd. * * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "ieee754dp.h" union ieee754dp ieee754dp_flong(s64 x) { u64 xm; int xe; int xs; ieee754_clearcx(); if (x == 0) return ieee754dp_zero(0); if (x == 1 || x == -1) return ieee754dp_one(x < 0); if (x == 10 || x == -10) return ieee754dp_ten(x < 0); xs = (x < 0); if (xs) { if (x == (1ULL << 63)) xm = (1ULL << 63); /* max neg can't be safely negated */ else xm = -x; } else { xm = x; } /* normalize */ xe = DP_FBITS + 3; if (xm >> (DP_FBITS + 1 + 3)) { /* shunt out overflow bits */ while (xm >> (DP_FBITS + 1 + 3)) { XDPSRSX1(); } } else { /* normalize in grs extended double precision */ while ((xm >> (DP_FBITS + 3)) == 0) { xm <<= 1; xe--; } } return ieee754dp_format(xs, xe, xm); }