1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "quad.h"
30
31 #ifdef __sparcv9
32
33 /*
34 * _Qp_add(pz, ox, oy) sets *pz = *ox + *oy.
35 */
36 void
_Qp_add(union longdouble * pz,const union longdouble * ox,const union longdouble * oy)37 _Qp_add(union longdouble *pz, const union longdouble *ox,
38 const union longdouble *oy)
39
40 #else
41
42 /*
43 * _Q_add(ox, oy) returns *ox + *oy.
44 */
45 union longdouble
46 _Q_add(const union longdouble *ox, const union longdouble *oy)
47
48 #endif /* __sparcv9 */
49
50 {
51 union longdouble z;
52 const union longdouble *x, *y;
53 unsigned int xm, ym, tm, fsr;
54
55 /* sort so |x| >= |y| */
56 xm = ox->l.msw & 0x7fffffff;
57 ym = oy->l.msw & 0x7fffffff;
58 if (ym > xm || ym == xm && (oy->l.frac2 > ox->l.frac2 ||
59 oy->l.frac2 == ox->l.frac2 && (oy->l.frac3 > ox->l.frac3 ||
60 oy->l.frac3 == ox->l.frac3 && oy->l.frac4 > ox->l.frac4))) {
61 y = ox;
62 x = oy;
63 tm = xm;
64 xm = ym;
65 ym = tm;
66 } else {
67 x = ox;
68 y = oy;
69 }
70
71 /* get the fsr */
72 __quad_getfsrp(&fsr);
73
74 /* handle nan and inf cases */
75 if (xm >= 0x7fff0000) {
76 /* x is nan or inf */
77 if (ym >= 0x7fff0000) {
78 /* y is nan or inf */
79 if ((ym & 0xffff) | y->l.frac2 | y->l.frac3 |
80 y->l.frac4) {
81 /* y is nan; x must be nan too */
82 /* the following logic implements V9 app. B */
83 if (!(ym & 0x8000)) {
84 /* y is snan, signal invalid */
85 if (fsr & FSR_NVM) {
86 __quad_faddq(ox, oy, &Z);
87 } else {
88 Z = (xm & 0x8000)? *y : *oy;
89 Z.l.msw |= 0x8000;
90 fsr = (fsr & ~FSR_CEXC) |
91 FSR_NVA | FSR_NVC;
92 __quad_setfsrp(&fsr);
93 }
94 QUAD_RETURN(Z);
95 }
96 /* x and y are both qnan */
97 Z = *oy;
98 QUAD_RETURN(Z);
99 }
100 if (!((xm & 0xffff) | x->l.frac2 | x->l.frac3 |
101 x->l.frac4)) {
102 /* x and y are both inf */
103 if ((x->l.msw ^ y->l.msw) & 0x80000000) {
104 /* inf - inf, signal invalid */
105 if (fsr & FSR_NVM) {
106 __quad_faddq(ox, oy, &Z);
107 } else {
108 Z.l.msw = 0x7fffffff;
109 Z.l.frac2 = Z.l.frac3 =
110 Z.l.frac4 = 0xffffffff;
111 fsr = (fsr & ~FSR_CEXC) |
112 FSR_NVA | FSR_NVC;
113 __quad_setfsrp(&fsr);
114 }
115 QUAD_RETURN(Z);
116 }
117 /* inf + inf, return inf */
118 Z = *x;
119 QUAD_RETURN(Z);
120 }
121 }
122 if ((xm & 0xffff) | x->l.frac2 | x->l.frac3 | x->l.frac4) {
123 /* x is nan */
124 if (!(xm & 0x8000)) {
125 /* snan, signal invalid */
126 if (fsr & FSR_NVM) {
127 __quad_faddq(ox, oy, &Z);
128 } else {
129 Z = *x;
130 Z.l.msw |= 0x8000;
131 fsr = (fsr & ~FSR_CEXC) | FSR_NVA |
132 FSR_NVC;
133 __quad_setfsrp(&fsr);
134 }
135 QUAD_RETURN(Z);
136 }
137 Z = *x;
138 QUAD_RETURN(Z);
139 }
140 /* x is inf */
141 Z = *x;
142 QUAD_RETURN(Z);
143 }
144
145 /* now x and y are finite and |x| >= |y| */
146 fsr &= ~FSR_CEXC;
147 z.l.msw = (x->l.msw & 0x80000000);
148 if ((x->l.msw ^ y->l.msw) & 0x80000000)
149 __quad_mag_sub(x, y, &z, &fsr);
150 else
151 __quad_mag_add(x, y, &z, &fsr);
152 if ((fsr & FSR_CEXC) & (fsr >> 23)) {
153 __quad_setfsrp(&fsr);
154 __quad_faddq(ox, oy, &Z);
155 } else {
156 Z = z;
157 fsr |= (fsr & 0x1f) << 5;
158 __quad_setfsrp(&fsr);
159 }
160 QUAD_RETURN(Z);
161 }
162