From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- arch/mips/math-emu/sp_flong.c | 64 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 arch/mips/math-emu/sp_flong.c (limited to 'arch/mips/math-emu/sp_flong.c') diff --git a/arch/mips/math-emu/sp_flong.c b/arch/mips/math-emu/sp_flong.c new file mode 100644 index 000000000..012e30ce7 --- /dev/null +++ b/arch/mips/math-emu/sp_flong.c @@ -0,0 +1,64 @@ +/* IEEE754 floating point arithmetic + * single precision + */ +/* + * 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 "ieee754sp.h" + +union ieee754sp ieee754sp_flong(s64 x) +{ + u64 xm; /* <--- need 64-bit mantissa temp */ + int xe; + int xs; + + ieee754_clearcx(); + + if (x == 0) + return ieee754sp_zero(0); + if (x == 1 || x == -1) + return ieee754sp_one(x < 0); + if (x == 10 || x == -10) + return ieee754sp_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; + } + xe = SP_FBITS + 3; + + if (xm >> (SP_FBITS + 1 + 3)) { + /* shunt out overflow bits + */ + while (xm >> (SP_FBITS + 1 + 3)) { + SPXSRSX1(); + } + } else { + /* normalize in grs extended single precision */ + while ((xm >> (SP_FBITS + 3)) == 0) { + xm <<= 1; + xe--; + } + } + return ieee754sp_format(xs, xe, xm); +} -- cgit v1.2.3-54-g00ecf