sp_simple.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/* IEEE754 floating point arithmetic
 3 * single precision
 4 */
 5/*
 6 * MIPS floating point support
 7 * Copyright (C) 1994-2000 Algorithmics Ltd.
 8 */
 9
10#include "ieee754sp.h"
11
12union ieee754sp ieee754sp_neg(union ieee754sp x)
13{
14	union ieee754sp y;
15
16	if (ieee754_csr.abs2008) {
17		y = x;
18		SPSIGN(y) = !SPSIGN(x);
19	} else {
20		unsigned int oldrm;
21
22		oldrm = ieee754_csr.rm;
23		ieee754_csr.rm = FPU_CSR_RD;
24		y = ieee754sp_sub(ieee754sp_zero(0), x);
25		ieee754_csr.rm = oldrm;
26	}
27	return y;
28}
29
30union ieee754sp ieee754sp_abs(union ieee754sp x)
31{
32	union ieee754sp y;
33
34	if (ieee754_csr.abs2008) {
35		y = x;
36		SPSIGN(y) = 0;
37	} else {
38		unsigned int oldrm;
39
40		oldrm = ieee754_csr.rm;
41		ieee754_csr.rm = FPU_CSR_RD;
42		if (SPSIGN(x))
43			y = ieee754sp_sub(ieee754sp_zero(0), x);
44		else
45			y = ieee754sp_add(ieee754sp_zero(0), x);
46		ieee754_csr.rm = oldrm;
47	}
48	return y;
49}