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- /* ieee-utils/fp-gnux86.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Brian Gough
- *
- * 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 <stdio.h>
- #include <fpu_control.h>
- #include "gsl_errno.h"
- #include "gsl_ieee_utils.h"
- /* Handle libc5, where _FPU_SETCW is not available, suggested by
- OKUJI Yoshinori <okuji@gnu.org> and Evgeny Stambulchik
- <fnevgeny@plasma-gate.weizmann.ac.il> */
- #ifndef _FPU_SETCW
- #include <i386/fpu_control.h>
- #define _FPU_SETCW(cw) __setfpucw(cw)
- #endif
- int
- gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
- {
- unsigned short mode = 0 ;
- switch (precision)
- {
- case GSL_IEEE_SINGLE_PRECISION:
- mode |= _FPU_SINGLE ;
- break ;
- case GSL_IEEE_DOUBLE_PRECISION:
- mode |= _FPU_DOUBLE ;
- break ;
- case GSL_IEEE_EXTENDED_PRECISION:
- mode |= _FPU_EXTENDED ;
- break ;
- default:
- mode |= _FPU_EXTENDED ;
- }
- switch (rounding)
- {
- case GSL_IEEE_ROUND_TO_NEAREST:
- mode |= _FPU_RC_NEAREST ;
- break ;
- case GSL_IEEE_ROUND_DOWN:
- mode |= _FPU_RC_DOWN ;
- break ;
- case GSL_IEEE_ROUND_UP:
- mode |= _FPU_RC_UP ;
- break ;
- case GSL_IEEE_ROUND_TO_ZERO:
- mode |= _FPU_RC_ZERO ;
- break ;
- default:
- mode |= _FPU_RC_NEAREST ;
- }
- if (exception_mask & GSL_IEEE_MASK_INVALID)
- mode |= _FPU_MASK_IM ;
- if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
- mode |= _FPU_MASK_DM ;
- if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
- mode |= _FPU_MASK_ZM ;
- if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
- mode |= _FPU_MASK_OM ;
- if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
- mode |= _FPU_MASK_UM ;
- if (exception_mask & GSL_IEEE_TRAP_INEXACT)
- {
- mode &= ~ _FPU_MASK_PM ;
- }
- else
- {
- mode |= _FPU_MASK_PM ;
- }
- _FPU_SETCW(mode) ;
- #if HAVE_FPU_X86_SSE
- #define _FPU_SETMXCSR(cw_sse) asm volatile ("ldmxcsr %0" : : "m" (*&cw_sse))
- {
- unsigned int mode_sse = 0;
- mode_sse |= (mode & 0x3f)<<7; /* exception masks */
- mode_sse |= (mode & 0xc00)<<3; /* rounding control */
-
- _FPU_SETMXCSR(mode_sse);
- }
- #endif
- return GSL_SUCCESS ;
- }
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