1// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
2// See https://llvm.org/LICENSE.txt for license information.
3// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
4
5#include "../int_math.h"
6#include "DD.h"
7
8#define makeFinite(x)                                                          \
9  {                                                                            \
10    (x).s.hi = crt_copysign(crt_isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi);        \
11    (x).s.lo = 0.0;                                                            \
12  }
13
14#define zeroNaN(x)                                                             \
15  {                                                                            \
16    if (crt_isnan((x).s.hi)) {                                                 \
17      (x).s.hi = crt_copysign(0.0, (x).s.hi);                                  \
18      (x).s.lo = 0.0;                                                          \
19    }                                                                          \
20  }
21
22long double _Complex __multc3(long double a, long double b, long double c,
23                              long double d) {
24  long double ac = __gcc_qmul(a, c);
25  long double bd = __gcc_qmul(b, d);
26  long double ad = __gcc_qmul(a, d);
27  long double bc = __gcc_qmul(b, c);
28
29  DD real = {.ld = __gcc_qsub(ac, bd)};
30  DD imag = {.ld = __gcc_qadd(ad, bc)};
31
32  if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi)) {
33    int recalc = 0;
34
35    DD aDD = {.ld = a};
36    DD bDD = {.ld = b};
37    DD cDD = {.ld = c};
38    DD dDD = {.ld = d};
39
40    if (crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.hi)) {
41      makeFinite(aDD);
42      makeFinite(bDD);
43      zeroNaN(cDD);
44      zeroNaN(dDD);
45      recalc = 1;
46    }
47
48    if (crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi)) {
49      makeFinite(cDD);
50      makeFinite(dDD);
51      zeroNaN(aDD);
52      zeroNaN(bDD);
53      recalc = 1;
54    }
55
56    if (!recalc) {
57      DD acDD = {.ld = ac};
58      DD bdDD = {.ld = bd};
59      DD adDD = {.ld = ad};
60      DD bcDD = {.ld = bc};
61
62      if (crt_isinf(acDD.s.hi) || crt_isinf(bdDD.s.hi) ||
63          crt_isinf(adDD.s.hi) || crt_isinf(bcDD.s.hi)) {
64        zeroNaN(aDD);
65        zeroNaN(bDD);
66        zeroNaN(cDD);
67        zeroNaN(dDD);
68        recalc = 1;
69      }
70    }
71
72    if (recalc) {
73      real.s.hi = CRT_INFINITY * (aDD.s.hi * cDD.s.hi - bDD.s.hi * dDD.s.hi);
74      real.s.lo = 0.0;
75      imag.s.hi = CRT_INFINITY * (aDD.s.hi * dDD.s.hi + bDD.s.hi * cDD.s.hi);
76      imag.s.lo = 0.0;
77    }
78  }
79
80  long double _Complex z;
81  __real__ z = real.ld;
82  __imag__ z = imag.ld;
83
84  return z;
85}
86