compiler-rt/lib/builtins/ppc/multc3.c

   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
  22 long 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 }