57 lines
2.1 KiB
C
57 lines
2.1 KiB
C
|
/* FPU control word definitions. SH version.
|
||
|
Copyright (C) 1999, 2000 Free Software Foundation, Inc.
|
||
|
This file is part of the GNU C Library.
|
||
|
|
||
|
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
|
||
|
|
||
|
/* masking of interrupts */
|
||
|
#define _FPU_MASK_VM 0x0800 /* Invalid operation */
|
||
|
#define _FPU_MASK_ZM 0x0400 /* Division by zero */
|
||
|
#define _FPU_MASK_OM 0x0200 /* Overflow */
|
||
|
#define _FPU_MASK_UM 0x0100 /* Underflow */
|
||
|
#define _FPU_MASK_IM 0x0080 /* Inexact operation */
|
||
|
|
||
|
/* rounding control */
|
||
|
#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
|
||
|
#define _FPU_RC_ZERO 0x1
|
||
|
|
||
|
#define _FPU_RESERVED 0xffc00000 /* These bits are reserved. */
|
||
|
|
||
|
/* The fdlibm code requires strict IEEE double precision arithmetic,
|
||
|
and no interrupts for exceptions, rounding to nearest. */
|
||
|
#define _FPU_DEFAULT 0x00080000 /* Default value. */
|
||
|
#define _FPU_IEEE 0x00080f80 /* Default + exceptions enabled. */
|
||
|
|
||
|
/* Type of the control word. */
|
||
|
typedef unsigned int fpu_control_t;
|
||
|
|
||
|
/* Macros for accessing the hardware control word. */
|
||
|
#define _FPU_GETCW(cw) __asm__ ("sts fpscr,%0" : "=r" (cw))
|
||
|
|
||
|
#if defined __GNUC__
|
||
|
#define _FPU_SETCW(cw) __set_fpscr ((cw))
|
||
|
#else
|
||
|
#define _FPU_SETCW(cw) __asm__ ("lds %0,fpscr" : : "r" (cw))
|
||
|
#endif
|
||
|
|
||
|
/* Default control word set at startup. */
|
||
|
extern fpu_control_t __fpu_control;
|
||
|
|
||
|
#endif /* _FPU_CONTROL_H */
|