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
20COMPILER_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