1 /* ===-- mulsc3.c - Implement __mulsc3 -------------------------------------===
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 __mulsc3 for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
14
15 #include "int_lib.h"
16 #include <math.h>
17 #include <complex.h>
18
19 /* Returns: the product of a + ib and c + id */
20
21 float _Complex
__mulsc3(float __a,float __b,float __c,float __d)22 __mulsc3(float __a, float __b, float __c, float __d)
23 {
24 float __ac = __a * __c;
25 float __bd = __b * __d;
26 float __ad = __a * __d;
27 float __bc = __b * __c;
28 float _Complex z;
29 __real__ z = __ac - __bd;
30 __imag__ z = __ad + __bc;
31 if (isnan(__real__ z) && isnan(__imag__ z))
32 {
33 int __recalc = 0;
34 if (isinf(__a) || isinf(__b))
35 {
36 __a = copysignf(isinf(__a) ? 1 : 0, __a);
37 __b = copysignf(isinf(__b) ? 1 : 0, __b);
38 if (isnan(__c))
39 __c = copysignf(0, __c);
40 if (isnan(__d))
41 __d = copysignf(0, __d);
42 __recalc = 1;
43 }
44 if (isinf(__c) || isinf(__d))
45 {
46 __c = copysignf(isinf(__c) ? 1 : 0, __c);
47 __d = copysignf(isinf(__d) ? 1 : 0, __d);
48 if (isnan(__a))
49 __a = copysignf(0, __a);
50 if (isnan(__b))
51 __b = copysignf(0, __b);
52 __recalc = 1;
53 }
54 if (!__recalc && (isinf(__ac) || isinf(__bd) ||
55 isinf(__ad) || isinf(__bc)))
56 {
57 if (isnan(__a))
58 __a = copysignf(0, __a);
59 if (isnan(__b))
60 __b = copysignf(0, __b);
61 if (isnan(__c))
62 __c = copysignf(0, __c);
63 if (isnan(__d))
64 __d = copysignf(0, __d);
65 __recalc = 1;
66 }
67 if (__recalc)
68 {
69 __real__ z = INFINITY * (__a * __c - __b * __d);
70 __imag__ z = INFINITY * (__a * __d + __b * __c);
71 }
72 }
73 return z;
74 }
75