mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 01:40:07 +00:00
11b3488225
* crypt/md5-crypt.c (__md5_crypt_r): Clear arrays the key and salt string got copied in. Patch by Solar Designer <solar@false.com>. 2000-07-05 Andreas Jaeger <aj@suse.de> * manual/install.texi (Installation): Update information about add-ons. (Configuring and compiling): Update for glibc 2.2. 2000-07-04 Andreas Jaeger <aj@suse.de> * sysdeps/i386/fpu_control.h (_FPU_DEFAULT): Correct value. (_FPU_IEEE): Likewise. * math/Makefile (tests): Add test-fpucw. * math/test-fpucw.c (main): New file. 2000-07-05 Ulrich Drepper <drepper@redhat.com>
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/* FPU control word bits. i387 version.
|
|
Copyright (C) 1993, 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Olaf Flebbe.
|
|
|
|
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
|
|
|
|
/* Here is the dirty part. Set up your 387 through the control word
|
|
* (cw) register.
|
|
*
|
|
* 15-13 12 11-10 9-8 7-6 5 4 3 2 1 0
|
|
* | reserved | IC | RC | PC | reserved | PM | UM | OM | ZM | DM | IM
|
|
*
|
|
* IM: Invalid operation mask
|
|
* DM: Denormalized operand mask
|
|
* ZM: Zero-divide mask
|
|
* OM: Overflow mask
|
|
* UM: Underflow mask
|
|
* PM: Precision (inexact result) mask
|
|
*
|
|
* Mask bit is 1 means no interrupt.
|
|
*
|
|
* PC: Precision control
|
|
* 11 - round to extended precision
|
|
* 10 - round to double precision
|
|
* 00 - round to single precision
|
|
*
|
|
* RC: Rounding control
|
|
* 00 - rounding to nearest
|
|
* 01 - rounding down (toward - infinity)
|
|
* 10 - rounding up (toward + infinity)
|
|
* 11 - rounding toward zero
|
|
*
|
|
* IC: Infinity control
|
|
* That is for 8087 and 80287 only.
|
|
*
|
|
* The hardware default is 0x037f which we use.
|
|
*/
|
|
|
|
#include <features.h>
|
|
|
|
/* masking of interrupts */
|
|
#define _FPU_MASK_IM 0x01
|
|
#define _FPU_MASK_DM 0x02
|
|
#define _FPU_MASK_ZM 0x04
|
|
#define _FPU_MASK_OM 0x08
|
|
#define _FPU_MASK_UM 0x10
|
|
#define _FPU_MASK_PM 0x20
|
|
|
|
/* precision control */
|
|
#define _FPU_EXTENDED 0x300
|
|
#define _FPU_DOUBLE 0x200 /* fdlibm requires double precision */
|
|
#define _FPU_SINGLE 0x0 /* DO NOT USE */
|
|
|
|
/* rounding control */
|
|
#define _FPU_RC_NEAREST 0x0 /* RECOMMENDED */
|
|
#define _FPU_RC_DOWN 0x400
|
|
#define _FPU_RC_UP 0x800
|
|
#define _FPU_RC_ZERO 0xC00
|
|
|
|
#define _FPU_RESERVED 0xF0C0 /* Reserved bits in cw */
|
|
|
|
|
|
/* The fdlibm code requires strict IEEE double precision arithmetic,
|
|
and no interrupts for exceptions, rounding to nearest. */
|
|
|
|
#define _FPU_DEFAULT 0x037f
|
|
|
|
/* IEEE: same as above. */
|
|
#define _FPU_IEEE 0x037f
|
|
|
|
/* Type of the control word. */
|
|
typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__HI__)));
|
|
|
|
/* 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))
|
|
|
|
/* Default control word set at startup. */
|
|
extern fpu_control_t __fpu_control;
|
|
|
|
#endif /* fpu_control.h */
|