Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

Open Menu /sys/external/bsd/compiler_rt/dist/lib/builtins/mulxc3.c 
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
/* ===-- mulxc3.c - Implement __mulxc3 -------------------------------------===
 *
 *                     The LLVM Compiler Infrastructure
 *
 * This file is dual licensed under the MIT and the University of Illinois Open
 * Source Licenses. See LICENSE.TXT for details.
 *
 * ===----------------------------------------------------------------------===
 *
 * This file implements __mulxc3 for the compiler_rt library.
 *
 * ===----------------------------------------------------------------------===
 */

#if !_ARCH_PPC

#include "int_lib.h"
#include "int_math.h"

/* Returns: the product of a + ib and c + id */

COMPILER_RT_ABI Lcomplex
__mulxc3(long double __a, long double __b, long double __c, long double __d)
{
    long double __ac = __a * __c;
    long double __bd = __b * __d;
    long double __ad = __a * __d;
    long double __bc = __b * __c;
    Lcomplex z;
    COMPLEX_REAL(z) = __ac - __bd;
    COMPLEX_IMAGINARY(z) = __ad + __bc;
    if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z)))
    {
        int __recalc = 0;
        if (crt_isinf(__a) || crt_isinf(__b))
        {
            __a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
            __b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
            if (crt_isnan(__c))
                __c = crt_copysignl(0, __c);
            if (crt_isnan(__d))
                __d = crt_copysignl(0, __d);
            __recalc = 1;
        }
        if (crt_isinf(__c) || crt_isinf(__d))
        {
            __c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
            __d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
            if (crt_isnan(__a))
                __a = crt_copysignl(0, __a);
            if (crt_isnan(__b))
                __b = crt_copysignl(0, __b);
            __recalc = 1;
        }
        if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) ||
                          crt_isinf(__ad) || crt_isinf(__bc)))
        {
            if (crt_isnan(__a))
                __a = crt_copysignl(0, __a);
            if (crt_isnan(__b))
                __b = crt_copysignl(0, __b);
            if (crt_isnan(__c))
                __c = crt_copysignl(0, __c);
            if (crt_isnan(__d))
                __d = crt_copysignl(0, __d);
            __recalc = 1;
        }
        if (__recalc)
        {
            COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
            COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);
        }
    }
    return z;
}

#endif