1/* This file is distributed under the University of Illinois Open Source
2 * License. See LICENSE.TXT for details.
3 */
4
5#include "DD.h"
6#include "../int_math.h"
7
8#define makeFinite(x) { \
9    (x).s.hi = crt_copysign(crt_isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \
10    (x).s.lo = 0.0;                                                     \
11  }
12
13#define zeroNaN(x) { \
14    if (crt_isnan((x).s.hi)) {                                          \
15      (x).s.hi = crt_copysign(0.0, (x).s.hi);                     \
16      (x).s.lo = 0.0;                                                   \
17    }                                                                   \
18  }
19
20long double _Complex
21__multc3(long double a, long double b, long double c, long double d)
22{
23	long double ac = __gcc_qmul(a,c);
24	long double bd = __gcc_qmul(b,d);
25	long double ad = __gcc_qmul(a,d);
26	long double bc = __gcc_qmul(b,c);
27
28	DD real = { .ld = __gcc_qsub(ac,bd) };
29	DD imag = { .ld = __gcc_qadd(ad,bc) };
30
31	if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi))
32	{
33		int recalc = 0;
34
35		DD aDD = { .ld = a };
36		DD bDD = { .ld = b };
37		DD cDD = { .ld = c };
38		DD dDD = { .ld = d };
39
40		if (crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.hi))
41		{
42			makeFinite(aDD);
43			makeFinite(bDD);
44			zeroNaN(cDD);
45			zeroNaN(dDD);
46			recalc = 1;
47		}
48
49		if (crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi))
50		{
51			makeFinite(cDD);
52			makeFinite(dDD);
53			zeroNaN(aDD);
54			zeroNaN(bDD);
55			recalc = 1;
56		}
57
58		if (!recalc)
59		{
60			DD acDD = { .ld = ac };
61			DD bdDD = { .ld = bd };
62			DD adDD = { .ld = ad };
63			DD bcDD = { .ld = bc };
64
65			if (crt_isinf(acDD.s.hi) || crt_isinf(bdDD.s.hi) ||
66                            crt_isinf(adDD.s.hi) || crt_isinf(bcDD.s.hi))
67			{
68				zeroNaN(aDD);
69				zeroNaN(bDD);
70				zeroNaN(cDD);
71				zeroNaN(dDD);
72				recalc = 1;
73			}
74		}
75
76		if (recalc)
77		{
78			real.s.hi = CRT_INFINITY * (aDD.s.hi*cDD.s.hi - bDD.s.hi*dDD.s.hi);
79			real.s.lo = 0.0;
80			imag.s.hi = CRT_INFINITY * (aDD.s.hi*dDD.s.hi + bDD.s.hi*cDD.s.hi);
81			imag.s.lo = 0.0;
82		}
83	}
84
85	long double _Complex z;
86	__real__ z = real.ld;
87	__imag__ z = imag.ld;
88
89	return z;
90}
91