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 <math.h>
7
8 #if !defined(INFINITY) && defined(HUGE_VAL)
9 #define INFINITY HUGE_VAL
10 #endif /* INFINITY */
11
12 #define makeFinite(x) { \
13 (x).s.hi = __builtin_copysign(isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \
14 (x).s.lo = 0.0; \
15 }
16
17 #define zeroNaN(x) { \
18 if (isnan((x).s.hi)) { \
19 (x).s.hi = __builtin_copysign(0.0, (x).s.hi); \
20 (x).s.lo = 0.0; \
21 } \
22 }
23
24 long double __gcc_qadd(long double, long double);
25 long double __gcc_qsub(long double, long double);
26 long double __gcc_qmul(long double, long double);
27
28 long double _Complex
__multc3(long double a,long double b,long double c,long double d)29 __multc3(long double a, long double b, long double c, long double d)
30 {
31 long double ac = __gcc_qmul(a,c);
32 long double bd = __gcc_qmul(b,d);
33 long double ad = __gcc_qmul(a,d);
34 long double bc = __gcc_qmul(b,c);
35
36 DD real = { .ld = __gcc_qsub(ac,bd) };
37 DD imag = { .ld = __gcc_qadd(ad,bc) };
38
39 if (isnan(real.s.hi) && isnan(imag.s.hi))
40 {
41 int recalc = 0;
42
43 DD aDD = { .ld = a };
44 DD bDD = { .ld = b };
45 DD cDD = { .ld = c };
46 DD dDD = { .ld = d };
47
48 if (isinf(aDD.s.hi) || isinf(bDD.s.hi))
49 {
50 makeFinite(aDD);
51 makeFinite(bDD);
52 zeroNaN(cDD);
53 zeroNaN(dDD);
54 recalc = 1;
55 }
56
57 if (isinf(cDD.s.hi) || isinf(dDD.s.hi))
58 {
59 makeFinite(cDD);
60 makeFinite(dDD);
61 zeroNaN(aDD);
62 zeroNaN(bDD);
63 recalc = 1;
64 }
65
66 if (!recalc)
67 {
68 DD acDD = { .ld = ac };
69 DD bdDD = { .ld = bd };
70 DD adDD = { .ld = ad };
71 DD bcDD = { .ld = bc };
72
73 if (isinf(acDD.s.hi) || isinf(bdDD.s.hi) || isinf(adDD.s.hi) || isinf(bcDD.s.hi))
74 {
75 zeroNaN(aDD);
76 zeroNaN(bDD);
77 zeroNaN(cDD);
78 zeroNaN(dDD);
79 recalc = 1;
80 }
81 }
82
83 if (recalc)
84 {
85 real.s.hi = INFINITY * (aDD.s.hi*cDD.s.hi - bDD.s.hi*dDD.s.hi);
86 real.s.lo = 0.0;
87 imag.s.hi = INFINITY * (aDD.s.hi*dDD.s.hi + bDD.s.hi*cDD.s.hi);
88 imag.s.lo = 0.0;
89 }
90 }
91
92 long double _Complex z;
93 __real__ z = real.ld;
94 __imag__ z = imag.ld;
95
96 return z;
97 }
98