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
21float _Complex
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