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
12int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cmp, int sig)
13{
14	s64 vx;
15	s64 vy;
16
17	COMPXDP;
18	COMPYDP;
19
20	EXPLODEXDP;
21	EXPLODEYDP;
22	FLUSHXDP;
23	FLUSHYDP;
24	ieee754_clearcx();	/* Even clear inexact flag here */
25
26	if (ieee754_class_nan(xc) || ieee754_class_nan(yc)) {
27		if (sig ||
28		    xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN)
29			ieee754_setcx(IEEE754_INVALID_OPERATION);
30		return (cmp & IEEE754_CUN) != 0;
31	} else {
32		vx = x.bits;
33		vy = y.bits;
34
35		if (vx < 0)
36			vx = -vx ^ DP_SIGN_BIT;
37		if (vy < 0)
38			vy = -vy ^ DP_SIGN_BIT;
39
40		if (vx < vy)
41			return (cmp & IEEE754_CLT) != 0;
42		else if (vx == vy)
43			return (cmp & IEEE754_CEQ) != 0;
44		else
45			return (cmp & IEEE754_CGT) != 0;
46	}
47}
48