// SPDX-License-Identifier: GPL-2.0-only
/* IEEE754 floating point arithmetic
 * double precision: common utilities
 */
/*
 * MIPS floating point support
 * Copyright (C) 1994-2000 Algorithmics Ltd.
 */

#include "ieee754dp.h"

union ieee754dp ieee754dp_neg(union ieee754dp x)
{
        union ieee754dp y;

        if (ieee754_csr.abs2008) {
                y = x;
                DPSIGN(y) = !DPSIGN(x);
        } else {
                unsigned int oldrm;

                oldrm = ieee754_csr.rm;
                ieee754_csr.rm = FPU_CSR_RD;
                y = ieee754dp_sub(ieee754dp_zero(0), x);
                ieee754_csr.rm = oldrm;
        }
        return y;
}

union ieee754dp ieee754dp_abs(union ieee754dp x)
{
        union ieee754dp y;

        if (ieee754_csr.abs2008) {
                y = x;
                DPSIGN(y) = 0;
        } else {
                unsigned int oldrm;

                oldrm = ieee754_csr.rm;
                ieee754_csr.rm = FPU_CSR_RD;
                if (DPSIGN(x))
                        y = ieee754dp_sub(ieee754dp_zero(0), x);
                else
                        y = ieee754dp_add(ieee754dp_zero(0), x);
                ieee754_csr.rm = oldrm;
        }
        return y;
}