mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-17 10:30:20 +00:00
80 lines
2.5 KiB
C
80 lines
2.5 KiB
C
|
/* 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;
|
||
|
|
|
||
|
|
/* 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 */
|