| /* 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 2 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/gsl_ieee_utils.h> |
| #include <gsl/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 ; |
| } |