mulsc3.c revision 2d1fdb26e458c4ddc04155c1d421bced3ba90cd0 
1/* ===-- mulsc3.c - Implement __mulsc3 -------------------------------------===
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 __mulsc3 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
20COMPILER_RT_ABI float _Complex
21__mulsc3(float __a, float __b, float __c, float __d)
22{
23    float __ac = __a * __c;
24    float __bd = __b * __d;
25    float __ad = __a * __d;
26    float __bc = __b * __c;
27    float _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_copysignf(crt_isinf(__a) ? 1 : 0, __a);
36            __b = crt_copysignf(crt_isinf(__b) ? 1 : 0, __b);
37            if (crt_isnan(__c))
38                __c = crt_copysignf(0, __c);
39            if (crt_isnan(__d))
40                __d = crt_copysignf(0, __d);
41            __recalc = 1;
42        }
43        if (crt_isinf(__c) || crt_isinf(__d))
44        {
45            __c = crt_copysignf(crt_isinf(__c) ? 1 : 0, __c);
46            __d = crt_copysignf(crt_isinf(__d) ? 1 : 0, __d);
47            if (crt_isnan(__a))
48                __a = crt_copysignf(0, __a);
49            if (crt_isnan(__b))
50                __b = crt_copysignf(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_copysignf(0, __a);
58            if (crt_isnan(__b))
59                __b = crt_copysignf(0, __b);
60            if (crt_isnan(__c))
61                __c = crt_copysignf(0, __c);
62            if (crt_isnan(__d))
63                __d = crt_copysignf(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