1*3cab2bb3Spatrick //===-- muldc3.c - Implement __muldc3 -------------------------------------===//
2*3cab2bb3Spatrick //
3*3cab2bb3Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*3cab2bb3Spatrick // See https://llvm.org/LICENSE.txt for license information.
5*3cab2bb3Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*3cab2bb3Spatrick //
7*3cab2bb3Spatrick //===----------------------------------------------------------------------===//
8*3cab2bb3Spatrick //
9*3cab2bb3Spatrick // This file implements __muldc3 for the compiler_rt library.
10*3cab2bb3Spatrick //
11*3cab2bb3Spatrick //===----------------------------------------------------------------------===//
12*3cab2bb3Spatrick
13*3cab2bb3Spatrick #include "int_lib.h"
14*3cab2bb3Spatrick #include "int_math.h"
15*3cab2bb3Spatrick
16*3cab2bb3Spatrick // Returns: the product of a + ib and c + id
17*3cab2bb3Spatrick
__muldc3(double __a,double __b,double __c,double __d)18*3cab2bb3Spatrick COMPILER_RT_ABI Dcomplex __muldc3(double __a, double __b, double __c,
19*3cab2bb3Spatrick double __d) {
20*3cab2bb3Spatrick double __ac = __a * __c;
21*3cab2bb3Spatrick double __bd = __b * __d;
22*3cab2bb3Spatrick double __ad = __a * __d;
23*3cab2bb3Spatrick double __bc = __b * __c;
24*3cab2bb3Spatrick Dcomplex z;
25*3cab2bb3Spatrick COMPLEX_REAL(z) = __ac - __bd;
26*3cab2bb3Spatrick COMPLEX_IMAGINARY(z) = __ad + __bc;
27*3cab2bb3Spatrick if (crt_isnan(COMPLEX_REAL(z)) && crt_isnan(COMPLEX_IMAGINARY(z))) {
28*3cab2bb3Spatrick int __recalc = 0;
29*3cab2bb3Spatrick if (crt_isinf(__a) || crt_isinf(__b)) {
30*3cab2bb3Spatrick __a = crt_copysign(crt_isinf(__a) ? 1 : 0, __a);
31*3cab2bb3Spatrick __b = crt_copysign(crt_isinf(__b) ? 1 : 0, __b);
32*3cab2bb3Spatrick if (crt_isnan(__c))
33*3cab2bb3Spatrick __c = crt_copysign(0, __c);
34*3cab2bb3Spatrick if (crt_isnan(__d))
35*3cab2bb3Spatrick __d = crt_copysign(0, __d);
36*3cab2bb3Spatrick __recalc = 1;
37*3cab2bb3Spatrick }
38*3cab2bb3Spatrick if (crt_isinf(__c) || crt_isinf(__d)) {
39*3cab2bb3Spatrick __c = crt_copysign(crt_isinf(__c) ? 1 : 0, __c);
40*3cab2bb3Spatrick __d = crt_copysign(crt_isinf(__d) ? 1 : 0, __d);
41*3cab2bb3Spatrick if (crt_isnan(__a))
42*3cab2bb3Spatrick __a = crt_copysign(0, __a);
43*3cab2bb3Spatrick if (crt_isnan(__b))
44*3cab2bb3Spatrick __b = crt_copysign(0, __b);
45*3cab2bb3Spatrick __recalc = 1;
46*3cab2bb3Spatrick }
47*3cab2bb3Spatrick if (!__recalc && (crt_isinf(__ac) || crt_isinf(__bd) || crt_isinf(__ad) ||
48*3cab2bb3Spatrick crt_isinf(__bc))) {
49*3cab2bb3Spatrick if (crt_isnan(__a))
50*3cab2bb3Spatrick __a = crt_copysign(0, __a);
51*3cab2bb3Spatrick if (crt_isnan(__b))
52*3cab2bb3Spatrick __b = crt_copysign(0, __b);
53*3cab2bb3Spatrick if (crt_isnan(__c))
54*3cab2bb3Spatrick __c = crt_copysign(0, __c);
55*3cab2bb3Spatrick if (crt_isnan(__d))
56*3cab2bb3Spatrick __d = crt_copysign(0, __d);
57*3cab2bb3Spatrick __recalc = 1;
58*3cab2bb3Spatrick }
59*3cab2bb3Spatrick if (__recalc) {
60*3cab2bb3Spatrick COMPLEX_REAL(z) = CRT_INFINITY * (__a * __c - __b * __d);
61*3cab2bb3Spatrick COMPLEX_IMAGINARY(z) = CRT_INFINITY * (__a * __d + __b * __c);
62*3cab2bb3Spatrick }
63*3cab2bb3Spatrick }
64*3cab2bb3Spatrick return z;
65*3cab2bb3Spatrick }
66