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- /* ieee-utils/fp-os2.c
- *
- * Copyright (C) 2001 Henry Sobotka <sobotka@axess.com>
- *
- * This program 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 of the License, or (at
- * your option) any later version.
- *
- * This program 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- #include <float.h>
- #include "gsl_ieee_utils.h"
- #include "gsl_errno.h"
- int
- gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
- {
- unsigned mode = 0;
- switch (precision)
- {
- case GSL_IEEE_SINGLE_PRECISION:
- _control87(PC_24, MCW_PC);
- break ;
- case GSL_IEEE_DOUBLE_PRECISION:
- _control87(PC_53, MCW_PC);
- break ;
- case GSL_IEEE_EXTENDED_PRECISION:
- _control87(PC_64, MCW_PC);
- break ;
- }
- switch (rounding)
- {
- case GSL_IEEE_ROUND_TO_NEAREST:
- _control87(RC_NEAR, MCW_RC);
- break ;
- case GSL_IEEE_ROUND_DOWN:
- _control87(RC_DOWN, MCW_RC);
- break ;
- case GSL_IEEE_ROUND_UP:
- _control87(RC_UP, MCW_RC);
- break ;
- case GSL_IEEE_ROUND_TO_ZERO:
- _control87(RC_CHOP, MCW_RC);
- break ;
- default:
- _control87(RC_NEAR, MCW_RC);
- }
- /* Turn on all the exceptions apart from 'inexact' */
- mode = EM_INVALID | EM_DENORMAL | EM_ZERODIVIDE | EM_OVERFLOW | EM_UNDERFLOW;
- if (exception_mask & GSL_IEEE_MASK_INVALID)
- mode &= ~ EM_INVALID;
- if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
- mode &= ~ EM_DENORMAL;
- if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
- mode &= ~ EM_ZERODIVIDE;
- if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
- mode &= ~ EM_OVERFLOW;
- if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
- mode &= ~ EM_UNDERFLOW;
- if (exception_mask & GSL_IEEE_TRAP_INEXACT)
- {
- mode |= EM_INEXACT;
- }
- else
- {
- mode &= ~ EM_INEXACT;
- }
- _control87(mode, MCW_EM);
- return GSL_SUCCESS ;
- }
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