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
|
/* ===-- muldc3.c - Implement __muldc3 -------------------------------------===
*
* 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 __muldc3 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
#include "int_math.h"
/* Returns: the product of a + ib and c + id */
double _Complex
__muldc3(double __a, double __b, double __c, double __d)
{
double __ac = __a * __c;
double __bd = __b * __d;
double __ad = __a * __d;
double __bc = __b * __c;
double _Complex z;
__real__ z = __ac - __bd;
__imag__ z = __ad + __bc;
if (crt_isnan(__real__ z) && crt_isnan(__imag__ z))
{
int __recalc = 0;
if (crt_isinf(__a) || crt_isinf(__b))
{
__a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a);
__b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b);
if (crt_isnan(__c))
__c = crt_copysign(0, __c);
if (crt_isnan(__d))
__d = crt_copysign(0, __d);
__recalc = 1;
}
if (crt_isinf(__c) || crt_isinf(__d))
{
__c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c);
__d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d);
if (crt_isnan(__a))
__a = crt_copysign(0, __a);
if (crt_isnan(__b))
__b = crt_copysign(0, __b);
__recalc = 1;
}
if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) ||
crt_isinf(__ad) || crt_isinf(__bc)))
{
if (crt_isnan(__a))
__a = crt_copysign(0, __a);
if (crt_isnan(__b))
__b = crt_copysign(0, __b);
if (crt_isnan(__c))
__c = crt_copysign(0, __c);
if (crt_isnan(__d))
__d = crt_copysign(0, __d);
__recalc = 1;
}
if (__recalc)
{
__real__ z = CRT_INFINITY * (__a * __c - __b * __d);
__imag__ z = CRT_INFINITY * (__a * __d + __b * __c);
}
}
return z;
}
|
