1 /* ===-- mulxc3.c - Implement __mulxc3 -------------------------------------===
2 *
3 * The LLVM Compiler Infrastructure
4 *
5 * This file is distributed under the University of Illinois Open Source
6 * License. See LICENSE.TXT for details.
7 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __mulxc3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15 #if !_ARCH_PPC
16
17 #include "int_lib.h"
18 #include <math.h>
19 #include <complex.h>
20
21 /* Returns: the product of a + ib and c + id */
22
23 long double _Complex
__mulxc3(long double __a,long double __b,long double __c,long double __d)24 __mulxc3(long double __a, long double __b, long double __c, long double __d)
25 {
26 long double __ac = __a * __c;
27 long double __bd = __b * __d;
28 long double __ad = __a * __d;
29 long double __bc = __b * __c;
30 long double _Complex z;
31 __real__ z = __ac - __bd;
32 __imag__ z = __ad + __bc;
33 if (isnan(__real__ z) && isnan(__imag__ z))
34 {
35 int __recalc = 0;
36 if (isinf(__a) || isinf(__b))
37 {
38 __a = copysignl(isinf(__a) ? 1 : 0, __a);
39 __b = copysignl(isinf(__b) ? 1 : 0, __b);
40 if (isnan(__c))
41 __c = copysignl(0, __c);
42 if (isnan(__d))
43 __d = copysignl(0, __d);
44 __recalc = 1;
45 }
46 if (isinf(__c) || isinf(__d))
47 {
48 __c = copysignl(isinf(__c) ? 1 : 0, __c);
49 __d = copysignl(isinf(__d) ? 1 : 0, __d);
50 if (isnan(__a))
51 __a = copysignl(0, __a);
52 if (isnan(__b))
53 __b = copysignl(0, __b);
54 __recalc = 1;
55 }
56 if (!__recalc && (isinf(__ac) || isinf(__bd) ||
57 isinf(__ad) || isinf(__bc)))
58 {
59 if (isnan(__a))
60 __a = copysignl(0, __a);
61 if (isnan(__b))
62 __b = copysignl(0, __b);
63 if (isnan(__c))
64 __c = copysignl(0, __c);
65 if (isnan(__d))
66 __d = copysignl(0, __d);
67 __recalc = 1;
68 }
69 if (__recalc)
70 {
71 __real__ z = INFINITY * (__a * __c - __b * __d);
72 __imag__ z = INFINITY * (__a * __d + __b * __c);
73 }
74 }
75 return z;
76 }
77
78 #endif
79