62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
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/* IEEE754 floating point arithmetic
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* double precision: common utilities
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*/
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/*
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* MIPS floating point support
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* Copyright (C) 1994-2000 Algorithmics Ltd.
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*
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* This program is free software; you can distribute it and/or modify it
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* under the terms of the GNU General Public License (Version 2) as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "ieee754dp.h"
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union ieee754dp ieee754dp_neg(union ieee754dp x)
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{
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union ieee754dp y;
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if (ieee754_csr.abs2008) {
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y = x;
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DPSIGN(y) = !DPSIGN(x);
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} else {
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unsigned int oldrm;
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oldrm = ieee754_csr.rm;
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ieee754_csr.rm = FPU_CSR_RD;
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y = ieee754dp_sub(ieee754dp_zero(0), x);
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ieee754_csr.rm = oldrm;
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}
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return y;
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}
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union ieee754dp ieee754dp_abs(union ieee754dp x)
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{
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union ieee754dp y;
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if (ieee754_csr.abs2008) {
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y = x;
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DPSIGN(y) = 0;
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} else {
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unsigned int oldrm;
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oldrm = ieee754_csr.rm;
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ieee754_csr.rm = FPU_CSR_RD;
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if (DPSIGN(x))
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y = ieee754dp_sub(ieee754dp_zero(0), x);
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else
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y = ieee754dp_add(ieee754dp_zero(0), x);
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ieee754_csr.rm = oldrm;
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}
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return y;
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}
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