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-/* FPU control word bits. i387 version.
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- Copyright (C) 1993,1995,1996,1997,1998,2000,2001 Free Software Foundation, Inc.
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- This file is part of the GNU C Library.
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- Contributed by Olaf Flebbe.
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-
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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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-
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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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-
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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, write to the Free
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- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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- 02111-1307 USA. */
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-
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-#ifndef _FPU_CONTROL_H
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-#define _FPU_CONTROL_H 1
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-
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-/* Here is the dirty part. Set up your 387 through the control word
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- * (cw) register.
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- *
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- * 15-13 12 11-10 9-8 7-6 5 4 3 2 1 0
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- * | reserved | IC | RC | PC | reserved | PM | UM | OM | ZM | DM | IM
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- *
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- * IM: Invalid operation mask
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- * DM: Denormalized operand mask
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- * ZM: Zero-divide mask
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- * OM: Overflow mask
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- * UM: Underflow mask
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- * PM: Precision (inexact result) mask
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- *
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- * Mask bit is 1 means no interrupt.
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- *
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- * PC: Precision control
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- * 11 - round to extended precision
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- * 10 - round to double precision
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- * 00 - round to single precision
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- *
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- * RC: Rounding control
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- * 00 - rounding to nearest
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- * 01 - rounding down (toward - infinity)
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- * 10 - rounding up (toward + infinity)
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- * 11 - rounding toward zero
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- *
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- * IC: Infinity control
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- * That is for 8087 and 80287 only.
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- *
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- * The hardware default is 0x037f which we use.
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- */
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-
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-#include <features.h>
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-
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-/* masking of interrupts */
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-#define _FPU_MASK_IM 0x01
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-#define _FPU_MASK_DM 0x02
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-#define _FPU_MASK_ZM 0x04
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-#define _FPU_MASK_OM 0x08
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-#define _FPU_MASK_UM 0x10
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-#define _FPU_MASK_PM 0x20
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-
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-/* precision control */
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-#define _FPU_EXTENDED 0x300 /* libm requires double extended precision. */
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-#define _FPU_DOUBLE 0x200
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-#define _FPU_SINGLE 0x0
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-
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-/* rounding control */
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-#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
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-#define _FPU_RC_DOWN 0x400
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-#define _FPU_RC_UP 0x800
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-#define _FPU_RC_ZERO 0xC00
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-
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-#define _FPU_RESERVED 0xF0C0 /* Reserved bits in cw */
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-
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-
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-/* The fdlibm code requires strict IEEE double precision arithmetic,
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- and no interrupts for exceptions, rounding to nearest. */
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-
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-#define _FPU_DEFAULT 0x037f
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-
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-/* IEEE: same as above. */
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-#define _FPU_IEEE 0x037f
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-
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-/* Type of the control word. */
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-typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
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-
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-/* Macros for accessing the hardware control word. */
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-#define _FPU_GETCW(cw) __asm__ ("fnstcw %0" : "=m" (*&cw))
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-#define _FPU_SETCW(cw) __asm__ ("fldcw %0" : : "m" (*&cw))
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-
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-/* Default control word set at startup. */
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-extern fpu_control_t __fpu_control;
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-
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-#endif /* fpu_control.h */
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