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/* ieee-utils/fp-gnuppc.c
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough, John Fisher
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdio.h>
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#include <fpu_control.h>
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#include <gsl/gsl_errno.h>
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#include <gsl/gsl_ieee_utils.h>
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/*
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* Identical to fp-gnux86.c, except with references to
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* _FPU_SINGLE, _FPU_DOUBLE, _FPU_EXTENDED, _FPU_MASK_DM
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* and _FPU_MASK_PM converted to errors.
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*/
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int
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gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
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{
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unsigned short mode = 0 ;
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switch (precision)
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{
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case GSL_IEEE_SINGLE_PRECISION:
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GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
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break ;
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case GSL_IEEE_DOUBLE_PRECISION:
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GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
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break ;
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case GSL_IEEE_EXTENDED_PRECISION:
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GSL_ERROR ("powerpc only supports default precision rounding", GSL_EUNSUP);
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break ;
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}
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switch (rounding)
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{
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case GSL_IEEE_ROUND_TO_NEAREST:
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mode |= _FPU_RC_NEAREST ;
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break ;
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case GSL_IEEE_ROUND_DOWN:
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mode |= _FPU_RC_DOWN ;
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break ;
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case GSL_IEEE_ROUND_UP:
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mode |= _FPU_RC_UP ;
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break ;
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case GSL_IEEE_ROUND_TO_ZERO:
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mode |= _FPU_RC_ZERO ;
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break ;
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default:
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mode |= _FPU_RC_NEAREST ;
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}
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if (exception_mask & GSL_IEEE_MASK_INVALID)
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mode |= _FPU_MASK_IM ;
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if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
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{
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/* do nothing */
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}
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else
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{
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GSL_ERROR ("powerpc does not support the denormalized operand exception. "
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"Use 'mask-denormalized' to work around this.", GSL_EUNSUP) ;
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}
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if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
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mode |= _FPU_MASK_ZM ;
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if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
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mode |= _FPU_MASK_OM ;
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if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
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mode |= _FPU_MASK_UM ;
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if (exception_mask & GSL_IEEE_TRAP_INEXACT)
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{
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GSL_ERROR ("powerpc does not support traps for inexact operations", GSL_EUNSUP) ;
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}
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_FPU_SETCW(mode) ;
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return GSL_SUCCESS ;
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}
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