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_fint(int x)
13{
14	unsigned int xm;
15	int xe;
16	int xs;
17
18	ieee754_clearcx();
19
20	if (x == 0)
21		return ieee754sp_zero(0);
22	if (x == 1 || x == -1)
23		return ieee754sp_one(x < 0);
24	if (x == 10 || x == -10)
25		return ieee754sp_ten(x < 0);
26
27	xs = (x < 0);
28	if (xs) {
29		if (x == (1 << 31))
30			xm = ((unsigned) 1 << 31);	/* max neg can't be safely negated */
31		else
32			xm = -x;
33	} else {
34		xm = x;
35	}
36	xe = SP_FBITS + 3;
37
38	if (xm >> (SP_FBITS + 1 + 3)) {
39		/* shunt out overflow bits
40		 */
41		while (xm >> (SP_FBITS + 1 + 3)) {
42			SPXSRSX1();
43		}
44	} else {
45		/* normalize in grs extended single precision
46		 */
47		while ((xm >> (SP_FBITS + 3)) == 0) {
48			xm <<= 1;
49			xe--;
50		}
51	}
52	return ieee754sp_format(xs, xe, xm);
53}
54