gcc/config/rs6000/ppc64-fp.c

   1 /* Functions needed for soft-float on powerpc64-linux, copied from
   2    libgcc2.c with macros expanded to force the use of specific types.
   3
   4    Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   5    2000, 2001, 2002, 2003, 2004, 2006  Free Software Foundation, Inc.
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 2, or (at your option) any later
  12 version.
  13
  14 In addition to the permissions in the GNU General Public License, the
  15 Free Software Foundation gives you unlimited permission to link the
  16 compiled version of this file into combinations with other programs,
  17 and to distribute those combinations without any restriction coming
  18 from the use of this file.  (The General Public License restrictions
  19 do apply in other respects; for example, they cover modification of
  20 the file, and distribution when not linked into a combine
  21 executable.)
  22
  23 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  24 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  25 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  26 for more details.
  27
  28 You should have received a copy of the GNU General Public License
  29 along with GCC; see the file COPYING.  If not, write to the Free
  30 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  31 02110-1301, USA.  */
  32
  33 #if defined(__powerpc64__) || defined (__64BIT__) || defined(__ppc64__)
  34 #define TMODES
  35 #include "config/fp-bit.h"
  36
  37 extern DItype __fixtfdi (TFtype);
  38 extern DItype __fixdfdi (DFtype);
  39 extern DItype __fixsfdi (SFtype);
  40 extern USItype __fixunsdfsi (DFtype);
  41 extern USItype __fixunssfsi (SFtype);
  42 extern TFtype __floatditf (DItype);
  43 extern TFtype __floatunditf (UDItype);
  44 extern DFtype __floatdidf (DItype);
  45 extern DFtype __floatundidf (UDItype);
  46 extern SFtype __floatdisf (DItype);
  47 extern SFtype __floatundisf (UDItype);
  48 extern DItype __fixunstfdi (TFtype);
  49
  50 static DItype local_fixunssfdi (SFtype);
  51 static DItype local_fixunsdfdi (DFtype);
  52
  53 DItype
  54 __fixtfdi (TFtype a)
  55 {
  56   if (a < 0)
  57     return - __fixunstfdi (-a);
  58   return __fixunstfdi (a);
  59 }
  60
  61 DItype
  62 __fixdfdi (DFtype a)
  63 {
  64   if (a < 0)
  65     return - local_fixunsdfdi (-a);
  66   return local_fixunsdfdi (a);
  67 }
  68
  69 DItype
  70 __fixsfdi (SFtype a)
  71 {
  72   if (a < 0)
  73     return - local_fixunssfdi (-a);
  74   return local_fixunssfdi (a);
  75 }
  76
  77 USItype
  78 __fixunsdfsi (DFtype a)
  79 {
  80   if (a >= - (DFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
  81     return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
  82                        - (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
  83   return (SItype) a;
  84 }
  85
  86 USItype
  87 __fixunssfsi (SFtype a)
  88 {
  89   if (a >= - (SFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
  90     return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
  91                        - (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
  92   return (SItype) a;
  93 }
  94
  95 TFtype
  96 __floatditf (DItype u)
  97 {
  98   DFtype dh, dl;
  99
 100   dh = (SItype) (u >> (sizeof (SItype) * 8));
 101   dh *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
 102   dl = (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
 103
 104   return (TFtype) dh + (TFtype) dl;
 105 }
 106
 107 TFtype
 108 __floatunditf (UDItype u)
 109 {
 110   DFtype dh, dl;
 111
 112   dh = (USItype) (u >> (sizeof (SItype) * 8));
 113   dh *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
 114   dl = (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
 115
 116   return (TFtype) dh + (TFtype) dl;
 117 }
 118
 119 DFtype
 120 __floatdidf (DItype u)
 121 {
 122   DFtype d;
 123
 124   d = (SItype) (u >> (sizeof (SItype) * 8));
 125   d *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
 126   d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
 127
 128   return d;
 129 }
 130
 131 DFtype
 132 __floatundidf (UDItype u)
 133 {
 134   DFtype d;
 135
 136   d = (USItype) (u >> (sizeof (SItype) * 8));
 137   d *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
 138   d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
 139
 140   return d;
 141 }
 142
 143 SFtype
 144 __floatdisf (DItype u)
 145 {
 146   DFtype f;
 147
 148   if (53 < (sizeof (DItype) * 8)
 149       && 53 > ((sizeof (DItype) * 8) - 53 + 24))
 150     {
 151       if (! (- ((DItype) 1 << 53) < u
 152              && u < ((DItype) 1 << 53)))
 153         {
 154           if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
 155             {
 156               u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
 157               u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
 158             }
 159         }
 160     }
 161   f = (SItype) (u >> (sizeof (SItype) * 8));
 162   f *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
 163   f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
 164
 165   return (SFtype) f;
 166 }
 167
 168 SFtype
 169 __floatundisf (UDItype u)
 170 {
 171   DFtype f;
 172
 173   if (53 < (sizeof (DItype) * 8)
 174       && 53 > ((sizeof (DItype) * 8) - 53 + 24))
 175     {
 176       if (u >= ((UDItype) 1 << 53))
 177         {
 178           if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
 179             {
 180               u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
 181               u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
 182             }
 183         }
 184     }
 185   f = (USItype) (u >> (sizeof (SItype) * 8));
 186   f *= 2.0 * (((UDItype) 1) << ((sizeof (SItype) * 8) - 1));
 187   f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
 188
 189   return (SFtype) f;
 190 }
 191
 192 DItype
 193 __fixunstfdi (TFtype a)
 194 {
 195   if (a < 0)
 196     return 0;
 197
 198   /* Compute high word of result, as a flonum.  */
 199   const TFtype b = (a / (((UDItype) 1) << (sizeof (SItype) * 8)));
 200   /* Convert that to fixed (but not to DItype!),
 201      and shift it into the high word.  */
 202   UDItype v = (USItype) b;
 203   v <<= (sizeof (SItype) * 8);
 204   /* Remove high part from the TFtype, leaving the low part as flonum.  */
 205   a -= (TFtype) v;
 206   /* Convert that to fixed (but not to DItype!) and add it in.
 207      Sometimes A comes out negative.  This is significant, since
 208      A has more bits than a long int does.  */
 209   if (a < 0)
 210     v -= (USItype) (-a);
 211   else
 212     v += (USItype) a;
 213   return v;
 214 }
 215
 216 /* This version is needed to prevent recursion; fixunsdfdi in libgcc
 217    calls fixdfdi, which in turn calls calls fixunsdfdi.  */
 218
 219 static DItype
 220 local_fixunsdfdi (DFtype a)
 221 {
 222   USItype hi, lo;
 223
 224   hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
 225   lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
 226   return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
 227 }
 228
 229 /* This version is needed to prevent recursion; fixunssfdi in libgcc
 230    calls fixsfdi, which in turn calls calls fixunssfdi.  */
 231
 232 static DItype
 233 local_fixunssfdi (SFtype original_a)
 234 {
 235   DFtype a = original_a;
 236   USItype hi, lo;
 237
 238   hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
 239   lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
 240   return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
 241 }
 242
 243 #endif /* __powerpc64__ */