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/* FPU control word bits. SPARC version.
Copyright (C) 1997 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Miguel de Icaza
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _FPU_CONTROL_H
#define _FPU_CONTROL_H 1
#include <features.h>
/* precision control */
#define _FPU_EXTENDED 0x00000000 /* RECOMMENDED */
#define _FPU_DOUBLE 0x20000000
#define _FPU_80BIT 0x30000000
#define _FPU_SINGLE 0x10000000 /* DO NOT USE */
/* rounding control / Sparc */
#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
#define _FPU_RC_DOWN 0x80000000
#define _FPU_RC_UP 0xc0000000
#define _FPU_RC_ZERO 0x40000000
#define _FPU_RESERVED 0x300000 /* Reserved bits in cw */
/* Now two recommended cw */
/* Linux default:
- extended precision
- rounding to nearest
- exceptions on overflow, zero divide and NaN */
#define _FPU_DEFAULT 0x1f
/* IEEE: same as above, but exceptions */
#define _FPU_IEEE 0x0
/* private namespace. It should only be used by crt0.o. */
extern unsigned short __fpu_control;
__BEGIN_DECLS
/* called by crt0.o. It can be used to manipulate 387 control word. */
extern void __setfpucw __P ((unsigned short));
__END_DECLS
/* Type of the control word. */
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
#define _FPU_GETCW(cw) __asm__ ("st %%fsr,%0" : "=m" (*&cw))
#define _FPU_SETCW(cw) __asm__ ("ld %0,%%fsr" : "=m" (*&cw))
#if 0
/* The intel original macros */
/* Macros for accessing the hardware control word. */
#define _FPU_GETCW(cw) __asm__ ("fnstcw %0" : "=m" (*&cw))
#define _FPU_SETCW(cw) __asm__ ("fldcw %0" : : "m" (*&cw))
#endif
/* Default control word set at startup. */
extern fpu_control_t __fpu_control;
__BEGIN_DECLS
/* Called at startup. It can be used to manipulate fpu control register. */
extern void __setfpucw __P ((fpu_control_t));
__END_DECLS
#endif /* fpu_control.h */
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