mirror of git://gcc.gnu.org/git/gcc.git
72 lines
2.1 KiB
C
72 lines
2.1 KiB
C
/* Software floating-point emulation.
|
|
Convert IEEE single to signed or unsigned _BitInt.
|
|
|
|
Copyright (C) 2023 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free
|
|
Software Foundation; either version 3, or (at your option) any later
|
|
version.
|
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
for more details.
|
|
|
|
Under Section 7 of GPL version 3, you are granted additional
|
|
permissions described in the GCC Runtime Library Exception, version
|
|
3.1, as published by the Free Software Foundation.
|
|
|
|
You should have received a copy of the GNU General Public License and
|
|
a copy of the GCC Runtime Library Exception along with this program;
|
|
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include "soft-fp.h"
|
|
#include "single.h"
|
|
#include "bitint.h"
|
|
|
|
#ifdef __BITINT_MAXWIDTH__
|
|
void
|
|
__fixsfbitint (UBILtype *r, SItype rprec, SFtype a)
|
|
{
|
|
FP_DECL_EX;
|
|
FP_DECL_S (A);
|
|
USItype arprec = rprec < 0 ? -rprec : rprec;
|
|
USItype rn = ((USItype) arprec + BIL_TYPE_SIZE - 1) / BIL_TYPE_SIZE;
|
|
USItype rv;
|
|
USItype rsize = arprec > SI_BITS ? SI_BITS : arprec;
|
|
USItype rsigned = rprec < 0;
|
|
USItype ovf = 0;
|
|
USItype shift = 0;
|
|
|
|
FP_INIT_EXCEPTIONS;
|
|
FP_UNPACK_RAW_S (A, a);
|
|
if (arprec > SI_BITS)
|
|
{
|
|
if (A_e < _FP_EXPBIAS_S || (A_s && !rsigned))
|
|
ovf = 1;
|
|
else if (A_e >= (_FP_EXPMAX_S < _FP_EXPBIAS_S + arprec
|
|
? _FP_EXPMAX_S
|
|
: _FP_EXPBIAS_S + arprec - rsigned))
|
|
{
|
|
ovf = 1;
|
|
if (A_s
|
|
&& A_e == _FP_EXPBIAS_S + arprec - 1
|
|
&& A_e < _FP_EXPMAX_S)
|
|
A_e -= arprec - SI_BITS;
|
|
}
|
|
else if (A_e >= _FP_EXPBIAS_S + SI_BITS - rsigned)
|
|
{
|
|
shift = A_e - (_FP_EXPBIAS_S + SI_BITS - rsigned - 1);
|
|
A_e -= shift;
|
|
}
|
|
}
|
|
FP_TO_INT_S (rv, A, rsize, rsigned);
|
|
FP_HANDLE_EXCEPTIONS;
|
|
FP_TO_BITINT (r, rn, arprec, shift, rv, rsize, rsigned, ovf, SI);
|
|
}
|
|
#endif
|