contrib/compiler-rt/lib/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 __gcc_qadd(long double, long double);
  21 long double __gcc_qsub(long double, long double);
  22 long double __gcc_qmul(long double, long double);
  23
  24 long double _Complex
  25 __multc3(long double a, long double b, long double c, long double d)
  26 {
  27         long double ac = __gcc_qmul(a,c);
  28         long double bd = __gcc_qmul(b,d);
  29         long double ad = __gcc_qmul(a,d);
  30         long double bc = __gcc_qmul(b,c);
  31
  32         DD real = { .ld = __gcc_qsub(ac,bd) };
  33         DD imag = { .ld = __gcc_qadd(ad,bc) };
  34
  35         if (crt_isnan(real.s.hi) && crt_isnan(imag.s.hi))
  36         {
  37                 int recalc = 0;
  38
  39                 DD aDD = { .ld = a };
  40                 DD bDD = { .ld = b };
  41                 DD cDD = { .ld = c };
  42                 DD dDD = { .ld = d };
  43
  44                 if (crt_isinf(aDD.s.hi) || crt_isinf(bDD.s.hi))
  45                 {
  46                         makeFinite(aDD);
  47                         makeFinite(bDD);
  48                         zeroNaN(cDD);
  49                         zeroNaN(dDD);
  50                         recalc = 1;
  51                 }
  52
  53                 if (crt_isinf(cDD.s.hi) || crt_isinf(dDD.s.hi))
  54                 {
  55                         makeFinite(cDD);
  56                         makeFinite(dDD);
  57                         zeroNaN(aDD);
  58                         zeroNaN(bDD);
  59                         recalc = 1;
  60                 }
  61
  62                 if (!recalc)
  63                 {
  64                         DD acDD = { .ld = ac };
  65                         DD bdDD = { .ld = bd };
  66                         DD adDD = { .ld = ad };
  67                         DD bcDD = { .ld = bc };
  68
  69                         if (crt_isinf(acDD.s.hi) || crt_isinf(bdDD.s.hi) ||
  70                             crt_isinf(adDD.s.hi) || crt_isinf(bcDD.s.hi))
  71                         {
  72                                 zeroNaN(aDD);
  73                                 zeroNaN(bDD);
  74                                 zeroNaN(cDD);
  75                                 zeroNaN(dDD);
  76                                 recalc = 1;
  77                         }
  78                 }
  79
  80                 if (recalc)
  81                 {
  82                         real.s.hi = CRT_INFINITY * (aDD.s.hi*cDD.s.hi - bDD.s.hi*dDD.s.hi);
  83                         real.s.lo = 0.0;
  84                         imag.s.hi = CRT_INFINITY * (aDD.s.hi*dDD.s.hi + bDD.s.hi*cDD.s.hi);
  85                         imag.s.lo = 0.0;
  86                 }
  87         }
  88
  89         long double _Complex z;
  90         __real__ z = real.ld;
  91         __imag__ z = imag.ld;
  92
  93         return z;
  94 }