82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
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/* Software floating-point emulation.
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Convert IEEE quad to signed or unsigned _BitInt.
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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 "quad.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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/* As mantissa is 112 bits + 1 implicit bit, we need 128-bit
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type, but on most 32-bit architectures TImode isn't supported.
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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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void
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__fixtfbitint (UBILtype *r, SItype rprec, TFtype a)
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{
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FP_DECL_EX;
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FP_DECL_Q (A);
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USItype arprec = rprec < 0 ? -rprec : rprec;
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USItype rn = ((USItype) arprec + BIL_TYPE_SIZE - 1) / BIL_TYPE_SIZE;
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UTItype rv;
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USItype rsize = arprec > TI_BITS ? TI_BITS : arprec;
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USItype rsigned = rprec < 0;
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USItype ovf = 0;
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USItype shift = 0;
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FP_INIT_EXCEPTIONS;
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FP_UNPACK_RAW_Q (A, a);
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if (arprec > TI_BITS)
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{
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if (A_e < _FP_EXPBIAS_Q || (A_s && !rsigned))
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ovf = 1;
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else if (A_e >= (_FP_EXPMAX_Q < _FP_EXPBIAS_Q + arprec
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? _FP_EXPMAX_Q
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: _FP_EXPBIAS_Q + arprec - rsigned))
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{
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ovf = 1;
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if (A_s
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&& A_e == _FP_EXPBIAS_Q + arprec - 1
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&& A_e < _FP_EXPMAX_Q)
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A_e -= arprec - TI_BITS;
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}
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else if (A_e >= _FP_EXPBIAS_Q + TI_BITS - rsigned)
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{
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shift = A_e - (_FP_EXPBIAS_Q + TI_BITS - rsigned - 1);
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A_e -= shift;
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}
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}
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FP_TO_INT_Q (rv, A, rsize, rsigned);
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FP_HANDLE_EXCEPTIONS;
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FP_TO_BITINT (r, rn, arprec, shift, rv, rsize, rsigned, ovf, TI);
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}
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#endif
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