GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcompiler_rt/divdc3.c Lines: 0 24 0.0 %
Date: 2017-11-13 Branches: 0 26 0.0 %

Line Branch Exec Source
1
/* ===-- divdc3.c - Implement __divdc3 -------------------------------------===
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 __divdc3 for the compiler_rt library.
11
 *
12
 * ===----------------------------------------------------------------------===
13
 */
14
15
#include "int_lib.h"
16
#include "int_math.h"
17
18
/* Returns: the quotient of (a + ib) / (c + id) */
19
20
COMPILER_RT_ABI Dcomplex
21
__divdc3(double __a, double __b, double __c, double __d)
22
{
23
    int __ilogbw = 0;
24
    double __logbw = crt_logb(crt_fmax(crt_fabs(__c), crt_fabs(__d)));
25
    if (crt_isfinite(__logbw))
26
    {
27
        __ilogbw = (int)__logbw;
28
        __c = crt_scalbn(__c, -__ilogbw);
29
        __d = crt_scalbn(__d, -__ilogbw);
30
    }
31
    double __denom = __c * __c + __d * __d;
32
    Dcomplex z;
33
    COMPLEX_REAL(z) = crt_scalbn((__a * __c + __b * __d) / __denom, -__ilogbw);
34
    COMPLEX_IMAGINARY(z) = crt_scalbn((__b * __c - __a * __d) / __denom, -__ilogbw);
35
    if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z)))
36
    {
37
        if ((__denom == 0.0) && (!crt_isnan(__a) || !crt_isnan(__b)))
38
        {
39
            COMPLEX_REAL(z) = crt_copysign(CRT_INFINITY, __c) * __a;
40
            COMPLEX_IMAGINARY(z) = crt_copysign(CRT_INFINITY, __c) * __b;
41
        }
42
        else if ((crt_isinf(__a) || crt_isinf(__b)) &&
43
                 crt_isfinite(__c) && crt_isfinite(__d))
44
        {
45
            __a = crt_copysign(crt_isinf(__a) ? 1.0 : 0.0, __a);
46
            __b = crt_copysign(crt_isinf(__b) ? 1.0 : 0.0, __b);
47
            COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c + __b * __d);
48
            COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__b * __c - __a * __d);
49
        }
50
        else if (crt_isinf(__logbw) && __logbw > 0.0 &&
51
                 crt_isfinite(__a) && crt_isfinite(__b))
52
        {
53
            __c = crt_copysign(crt_isinf(__c) ? 1.0 : 0.0, __c);
54
            __d = crt_copysign(crt_isinf(__d) ? 1.0 : 0.0, __d);
55
            COMPLEX_REAL(z) = 0.0 * (__a * __c + __b * __d);
56
            COMPLEX_IMAGINARY(z) = 0.0 * (__b * __c - __a * __d);
57
        }
58
    }
59
    return z;
60
}