75 lines
2.1 KiB
C
75 lines
2.1 KiB
C
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/* Software floating-point emulation.
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Convert a _BitInt to IEEE extended.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "soft-fp.h"
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#include "extended.h"
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#include "bitint.h"
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#ifdef __BITINT_MAXWIDTH__
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#ifndef TI_BITS
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/* While mantissa is 64 bits including 1 explicit bit, extended.h uses
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op-2.h for W_TYPE_SIZE 64 and op-4.h for W_TYPE_SIZE 32, so we have
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to use 128-bit type here. On most 32-bit architectures TImode isn't
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supported, so use _BitInt(128) instead. */
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typedef _BitInt(128) TItype;
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typedef unsigned _BitInt(128) UTItype;
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#define TI_BITS 128
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#endif
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XFtype
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__floatbitintxf (const UBILtype *i, SItype iprec)
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{
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TItype iv;
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USItype shift = 0;
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FP_DECL_EX;
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FP_DECL_E (A);
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XFtype a;
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FP_FROM_BITINT (i, iprec, iv, shift, TI);
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FP_INIT_ROUNDMODE;
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FP_FROM_INT_E (A, iv, TI_BITS, UTItype);
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if (shift)
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{
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A_e += shift;
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if (A_e >= _FP_EXPMAX_E)
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{
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/* Exponent too big; overflow to infinity. */
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#if _FP_W_TYPE_SIZE < 64
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_FP_OVERFLOW_SEMIRAW (E, 4, A);
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_FP_PACK_SEMIRAW (E, 4, A);
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#else
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_FP_OVERFLOW_SEMIRAW (E, 2, A);
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_FP_PACK_SEMIRAW (E, 2, A);
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#endif
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}
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}
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FP_PACK_RAW_E (a, A);
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FP_HANDLE_EXCEPTIONS;
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return a;
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}
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#endif
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