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      1 /* Software floating-point emulation.
      2    Convert a _BitInt to IEEE quad.
      3 
      4    Copyright (C) 2023 Free Software Foundation, Inc.
      5 
      6 This file is part of GCC.
      7 
      8 GCC is free software; you can redistribute it and/or modify it under
      9 the terms of the GNU General Public License as published by the Free
     10 Software Foundation; either version 3, or (at your option) any later
     11 version.
     12 
     13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
     14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
     15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     16 for more details.
     17 
     18 Under Section 7 of GPL version 3, you are granted additional
     19 permissions described in the GCC Runtime Library Exception, version
     20 3.1, as published by the Free Software Foundation.
     21 
     22 You should have received a copy of the GNU General Public License and
     23 a copy of the GCC Runtime Library Exception along with this program;
     24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     25 <http://www.gnu.org/licenses/>.  */
     26 
     27 #include "soft-fp.h"
     28 #include "quad.h"
     29 #include "bitint.h"
     30 
     31 #ifdef __BITINT_MAXWIDTH__
     32 #ifndef TI_BITS
     33 /* As mantissa is 112 bits + 1 implicit bit, we need 128-bit
     34    type, but on most 32-bit architectures TImode isn't supported.
     35    Use _BitInt(128) instead.  */
     36 typedef _BitInt(128) TItype;
     37 typedef unsigned _BitInt(128) UTItype;
     38 #define TI_BITS 128
     39 #endif
     40 
     41 TFtype
     42 __floatbitinttf (const UBILtype *i, SItype iprec)
     43 {
     44   TItype iv;
     45   USItype shift = 0;
     46   FP_DECL_EX;
     47   FP_DECL_Q (A);
     48   TFtype a;
     49 
     50   FP_FROM_BITINT (i, iprec, iv, shift, TI);
     51   FP_INIT_ROUNDMODE;
     52   FP_FROM_INT_Q (A, iv, TI_BITS, UTItype);
     53   if (shift)
     54     {
     55       A_e += shift;
     56       if (A_e >= _FP_EXPMAX_Q)
     57 	{
     58 	  /* Exponent too big; overflow to infinity.  */
     59 #if _FP_W_TYPE_SIZE < 64
     60 	  _FP_OVERFLOW_SEMIRAW (Q, 4, A);
     61 	  _FP_PACK_SEMIRAW (Q, 4, A);
     62 #else
     63 	  _FP_OVERFLOW_SEMIRAW (Q, 2, A);
     64 	  _FP_PACK_SEMIRAW (Q, 2, A);
     65 #endif
     66 	}
     67     }
     68   FP_PACK_RAW_Q (a, A);
     69   FP_HANDLE_EXCEPTIONS;
     70 
     71   return a;
     72 }
     73 #endif
     74