1 //===-- muldc3.c - Implement __muldc3 -------------------------------------===//
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
7 //===----------------------------------------------------------------------===//
9 // This file implements __muldc3 for the compiler_rt library.
11 //===----------------------------------------------------------------------===//
16 // Returns: the product of a + ib and c + id
18 COMPILER_RT_ABI Dcomplex __muldc3(double __a, double __b, double __c,
20 double __ac = __a * __c;
21 double __bd = __b * __d;
22 double __ad = __a * __d;
23 double __bc = __b * __c;
25 COMPLEX_REAL(z) = __ac - __bd;
26 COMPLEX_IMAGINARY(z) = __ad + __bc;
27 if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
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);
33 __c = crt_copysign(0, __c);
35 __d = crt_copysign(0, __d);
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);
42 __a = crt_copysign(0, __a);
44 __b = crt_copysign(0, __b);
47 if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) ||
50 __a = crt_copysign(0, __a);
52 __b = crt_copysign(0, __b);
54 __c = crt_copysign(0, __c);
56 __d = crt_copysign(0, __d);
60 COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
61 COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);