Blame sysdeps/alpha/ots_nintxq.c

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/* Software floating-point emulation: convert to fortran nearest.
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   Copyright (C) 1997-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Richard Henderson (rth@cygnus.com) and
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		  Jakub Jelinek (jj@ultra.linux.cz).
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library.  If not, see
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   <http://www.gnu.org/licenses/>.  */
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#include "local-soft-fp.h"
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long
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_OtsNintXQ (long al, long ah, long _round)
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{
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  FP_DECL_EX;
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  FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);
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  unsigned long r;
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  long s;
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  /* If bit 3 is set, then integer overflow detection is requested.  */
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  s = _round & 8 ? 1 : -1;
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  _round = _round & 3;
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  FP_INIT_ROUNDMODE;
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  AXP_UNPACK_SEMIRAW_Q(A, a);
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  /* Build 0.5 * sign(A) */
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  B_e = _FP_EXPBIAS_Q;
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  __FP_FRAC_SET_2 (B, 0, 0);
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  B_s = A_s;
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  FP_ADD_Q(C, A, B);
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  _FP_FRAC_SRL_2(C, _FP_WORKBITS);
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  _FP_FRAC_HIGH_RAW_Q(C) &= ~(_FP_W_TYPE)_FP_IMPLBIT_Q;
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  FP_TO_INT_Q(r, C, 64, s);
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  if (s > 0 && (_fex &= FP_EX_INVALID))
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    FP_HANDLE_EXCEPTIONS;
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  return r;
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}