1 /* ===-- muldc3.c - Implement __muldc3 -------------------------------------===
2 *
3 * The LLVM Compiler Infrastructure
4 *
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __muldc3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15 #include "int_lib.h"
16 #include "int_math.h"
17
18 /* Returns: the product of a + ib and c + id */
19
20 double _Complex
__muldc3(double __a,double __b,double __c,double __d)21 __muldc3(double __a, double __b, double __c, double __d)
22 {
23 double __ac = __a * __c;
24 double __bd = __b * __d;
25 double __ad = __a * __d;
26 double __bc = __b * __c;
27 double _Complex z;
28 __real__ z = __ac - __bd;
29 __imag__ z = __ad + __bc;
30 if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
31 {
32 int __recalc = 0;
33 if (crt_isinf(__a) || crt_isinf(__b))
34 {
35 __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a);
36 __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b);
37 if (crt_isnan(__c))
38 __c = crt_copysign(0, __c);
39 if (crt_isnan(__d))
40 __d = crt_copysign(0, __d);
41 __recalc = 1;
42 }
43 if (crt_isinf(__c) || crt_isinf(__d))
44 {
45 __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c);
46 __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d);
47 if (crt_isnan(__a))
48 __a = crt_copysign(0, __a);
49 if (crt_isnan(__b))
50 __b = crt_copysign(0, __b);
51 __recalc = 1;
52 }
53 if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) ||
54 crt_isinf(__ad) || crt_isinf(__bc)))
55 {
56 if (crt_isnan(__a))
57 __a = crt_copysign(0, __a);
58 if (crt_isnan(__b))
59 __b = crt_copysign(0, __b);
60 if (crt_isnan(__c))
61 __c = crt_copysign(0, __c);
62 if (crt_isnan(__d))
63 __d = crt_copysign(0, __d);
64 __recalc = 1;
65 }
66 if (__recalc)
67 {
68 __real__ z = CRT_INFINITY * (__a * __c - __b * __d);
69 __imag__ z = CRT_INFINITY * (__a * __d + __b * __c);
70 }
71 }
72 return z;
73 }
74