1 //===-- muldc3.c - Implement __muldc3 -------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements __muldc3 for the compiler_rt library.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "int_lib.h"
14 #include "int_math.h"
15
16 // Returns: the product of a + ib and c + id
17
__muldc3(double __a,double __b,double __c,double __d)18 COMPILER_RT_ABI Dcomplex __muldc3(double __a, double __b, double __c,
19 double __d) {
20 double __ac = __a * __c;
21 double __bd = __b * __d;
22 double __ad = __a * __d;
23 double __bc = __b * __c;
24 Dcomplex z;
25 COMPLEX_REAL(z) = __ac - __bd;
26 COMPLEX_IMAGINARY(z) = __ad + __bc;
27 if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
28 int __recalc = 0;
29 if (crt_isinf(__a) || crt_isinf(__b)) {
30 __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a);
31 __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b);
32 if (crt_isnan(__c))
33 __c = crt_copysign(0, __c);
34 if (crt_isnan(__d))
35 __d = crt_copysign(0, __d);
36 __recalc = 1;
37 }
38 if (crt_isinf(__c) || crt_isinf(__d)) {
39 __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c);
40 __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d);
41 if (crt_isnan(__a))
42 __a = crt_copysign(0, __a);
43 if (crt_isnan(__b))
44 __b = crt_copysign(0, __b);
45 __recalc = 1;
46 }
47 if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) ||
48 crt_isinf(__bc))) {
49 if (crt_isnan(__a))
50 __a = crt_copysign(0, __a);
51 if (crt_isnan(__b))
52 __b = crt_copysign(0, __b);
53 if (crt_isnan(__c))
54 __c = crt_copysign(0, __c);
55 if (crt_isnan(__d))
56 __d = crt_copysign(0, __d);
57 __recalc = 1;
58 }
59 if (__recalc) {
60 COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
61 COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);
62 }
63 }
64 return z;
65 }
66