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

   1 /* This file is distributed under the University of Illinois Open Source
   2  * License. See LICENSE.TXT for details.
   3  */
   4
   5 #include "DD.h"
   6 #include "../int_math.h"
   7
   8 #define makeFinite(x) { \
   9     (x).s.hi = crt_copysign(crt_isinf((x).s.hi) ? 1.0 : 0.0, (x).s.hi); \
  10     (x).s.lo = 0.0;                                                     \
  11   }
  12
  13 #define zeroNaN(x) { \
  14     if (crt_isnan((x).s.hi)) {                                          \
  15       (x).s.hi = crt_copysign(0.0, (x).s.hi);                     \
  16       (x).s.lo = 0.0;                                                   \
  17     }                                                                   \
  18   }
  19
  20 long double _Complex
  21 __multc3(long double a, long double b, long double c, long double d)
  22 {
  23         long double ac = __gcc_qmul(a,c);
  24         long double bd = __gcc_qmul(b,d);
  25         long double ad = __gcc_qmul(a,d);
  26         long double bc = __gcc_qmul(b,c);
  27
  28         DD real = { .ld = __gcc_qsub(ac,bd) };
  29         DD imag = { .ld = __gcc_qadd(ad,bc) };
  30
  31         if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi))
  32         {
  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                 {
  42                         makeFinite(aDD);
  43                         makeFinite(bDD);
  44                         zeroNaN(cDD);
  45                         zeroNaN(dDD);
  46                         recalc = 1;
  47                 }
  48
  49                 if (crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi))
  50                 {
  51                         makeFinite(cDD);
  52                         makeFinite(dDD);
  53                         zeroNaN(aDD);
  54                         zeroNaN(bDD);
  55                         recalc = 1;
  56                 }
  57
  58                 if (!recalc)
  59                 {
  60                         DD acDD = { .ld = ac };
  61                         DD bdDD = { .ld = bd };
  62                         DD adDD = { .ld = ad };
  63                         DD bcDD = { .ld = bc };
  64
  65                         if (crt_isinf(acDD.s.hi) || crt_isinf(bdDD.s.hi) ||
  66                             crt_isinf(adDD.s.hi) || crt_isinf(bcDD.s.hi))
  67                         {
  68                                 zeroNaN(aDD);
  69                                 zeroNaN(bDD);
  70                                 zeroNaN(cDD);
  71                                 zeroNaN(dDD);
  72                                 recalc = 1;
  73                         }
  74                 }
  75
  76                 if (recalc)
  77                 {
  78                         real.s.hi = CRT_INFINITY * (aDD.s.hi*cDD.s.hi - bDD.s.hi*dDD.s.hi);
  79                         real.s.lo = 0.0;
  80                         imag.s.hi = CRT_INFINITY * (aDD.s.hi*dDD.s.hi + bDD.s.hi*cDD.s.hi);
  81                         imag.s.lo = 0.0;
  82                 }
  83         }
  84
  85         long double _Complex z;
  86         __real__ z = real.ld;
  87         __imag__ z = imag.ld;
  88
  89         return z;
  90 }