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
12 int 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
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