1 //===-- mulxc3.c - Implement __mulxc3 -------------------------------------===//
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 __mulxc3 for the compiler_rt library.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #if !_ARCH_PPC
14
15 #include "int_lib.h"
16 #include "int_math.h"
17
18 // Returns: the product of a + ib and c + id
19
__mulxc3(long double __a,long double __b,long double __c,long double __d)20 COMPILER_RT_ABI Lcomplex __mulxc3(long double __a, long double __b,
21 long double __c, long double __d) {
22 long double __ac = __a * __c;
23 long double __bd = __b * __d;
24 long double __ad = __a * __d;
25 long double __bc = __b * __c;
26 Lcomplex z;
27 COMPLEX_REAL(z) = __ac - __bd;
28 COMPLEX_IMAGINARY(z) = __ad + __bc;
29 if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
30 int __recalc = 0;
31 if (crt_isinf(__a) || crt_isinf(__b)) {
32 __a = crt_copysignl(crt_isinf(__a) ? 1 : 0, __a);
33 __b = crt_copysignl(crt_isinf(__b) ? 1 : 0, __b);
34 if (crt_isnan(__c))
35 __c = crt_copysignl(0, __c);
36 if (crt_isnan(__d))
37 __d = crt_copysignl(0, __d);
38 __recalc = 1;
39 }
40 if (crt_isinf(__c) || crt_isinf(__d)) {
41 __c = crt_copysignl(crt_isinf(__c) ? 1 : 0, __c);
42 __d = crt_copysignl(crt_isinf(__d) ? 1 : 0, __d);
43 if (crt_isnan(__a))
44 __a = crt_copysignl(0, __a);
45 if (crt_isnan(__b))
46 __b = crt_copysignl(0, __b);
47 __recalc = 1;
48 }
49 if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) ||
50 crt_isinf(__bc))) {
51 if (crt_isnan(__a))
52 __a = crt_copysignl(0, __a);
53 if (crt_isnan(__b))
54 __b = crt_copysignl(0, __b);
55 if (crt_isnan(__c))
56 __c = crt_copysignl(0, __c);
57 if (crt_isnan(__d))
58 __d = crt_copysignl(0, __d);
59 __recalc = 1;
60 }
61 if (__recalc) {
62 COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
63 COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);
64 }
65 }
66 return z;
67 }
68
69 #endif
70