1// SPDX-License-Identifier: GPL-2.0-only
2/* IEEE754 floating point arithmetic
3 * double precision: common utilities
4 */
5/*
6 * MIPS floating point support
7 * Copyright (C) 1994-2000 Algorithmics Ltd.
8 */
9
10#include "ieee754dp.h"
11
12union ieee754dp ieee754dp_neg(union ieee754dp x)
13{
14	union ieee754dp y;
15
16	if (ieee754_csr.abs2008) {
17		y = x;
18		DPSIGN(y) = !DPSIGN(x);
19	} else {
20		unsigned int oldrm;
21
22		oldrm = ieee754_csr.rm;
23		ieee754_csr.rm = FPU_CSR_RD;
24		y = ieee754dp_sub(ieee754dp_zero(0), x);
25		ieee754_csr.rm = oldrm;
26	}
27	return y;
28}
29
30union ieee754dp ieee754dp_abs(union ieee754dp x)
31{
32	union ieee754dp y;
33
34	if (ieee754_csr.abs2008) {
35		y = x;
36		DPSIGN(y) = 0;
37	} else {
38		unsigned int oldrm;
39
40		oldrm = ieee754_csr.rm;
41		ieee754_csr.rm = FPU_CSR_RD;
42		if (DPSIGN(x))
43			y = ieee754dp_sub(ieee754dp_zero(0), x);
44		else
45			y = ieee754dp_add(ieee754dp_zero(0), x);
46		ieee754_csr.rm = oldrm;
47	}
48	return y;
49}
50