From 2729465a897156b9c745dc2fc00a0fdf56915dc6 Mon Sep 17 00:00:00 2001 From: "Viral B. Shah" Date: Wed, 24 Feb 2016 17:26:32 +0530 Subject: [PATCH] Use i386 ieeefp.h --- i387/bsd_ieeefp.h | 260 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 258 insertions(+), 2 deletions(-) diff --git a/i387/bsd_ieeefp.h b/i387/bsd_ieeefp.h index 6c89ad5..c676c45 100644 --- a/i387/bsd_ieeefp.h +++ b/i387/bsd_ieeefp.h @@ -1,2 +1,258 @@ -#include "cdefs-compat.h" -#include "amd64/bsd_ieeefp.h" +/*- + * Copyright (c) 2003 Peter Wemm. + * Copyright (c) 1990 Andrew Moore, Talke Studio + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93 + * $FreeBSD$ + */ + +#ifndef _MACHINE_IEEEFP_H_ +#define _MACHINE_IEEEFP_H_ + +/* + * Deprecated historical FPU control interface + * + * IEEE floating point type, constant and function definitions. + * XXX: FP*FLD and FP*OFF are undocumented pollution. + */ + +#ifndef _SYS_CDEFS_H_ +#error this file needs sys/cdefs.h as a prerequisite +#endif + +/* + * Rounding modes. + */ +typedef enum { + FP_RN=0, /* round to nearest */ + FP_RM, /* round down towards minus infinity */ + FP_RP, /* round up towards plus infinity */ + FP_RZ /* truncate */ +} fp_rnd_t; + +/* + * Precision (i.e., rounding precision) modes. + */ +typedef enum { + FP_PS=0, /* 24 bit (single-precision) */ + FP_PRS, /* reserved */ + FP_PD, /* 53 bit (double-precision) */ + FP_PE /* 64 bit (extended-precision) */ +} fp_prec_t; + +#define fp_except_t int + +/* + * Exception bit masks. + */ +#define FP_X_INV 0x01 /* invalid operation */ +#define FP_X_DNML 0x02 /* denormal */ +#define FP_X_DZ 0x04 /* zero divide */ +#define FP_X_OFL 0x08 /* overflow */ +#define FP_X_UFL 0x10 /* underflow */ +#define FP_X_IMP 0x20 /* (im)precision */ +#define FP_X_STK 0x40 /* stack fault */ + +/* + * FPU control word bit-field masks. + */ +#define FP_MSKS_FLD 0x3f /* exception masks field */ +#define FP_PRC_FLD 0x300 /* precision control field */ +#define FP_RND_FLD 0xc00 /* rounding control field */ + +/* + * FPU status word bit-field masks. + */ +#define FP_STKY_FLD 0x3f /* sticky flags field */ + +/* + * FPU control word bit-field offsets (shift counts). + */ +#define FP_MSKS_OFF 0 /* exception masks offset */ +#define FP_PRC_OFF 8 /* precision control offset */ +#define FP_RND_OFF 10 /* rounding control offset */ + +/* + * FPU status word bit-field offsets (shift counts). + */ +#define FP_STKY_OFF 0 /* sticky flags offset */ + +#ifdef __GNUCLIKE_ASM + +#define __fldcw(addr) __asm __volatile("fldcw %0" : : "m" (*(addr))) +#define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr))) +#define __fnclex() __asm __volatile("fnclex") +#define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr))) +#define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr))) +#define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr))) + +/* + * Load the control word. Be careful not to trap if there is a currently + * unmasked exception (ones that will become freshly unmasked are not a + * problem). This case must be handled by a save/restore of the + * environment or even of the full x87 state. Accessing the environment + * is very inefficient, so only do it when necessary. + */ +static __inline void +__fnldcw(unsigned short _cw, unsigned short _newcw) +{ + struct { + unsigned _cw; + unsigned _other[6]; + } _env; + unsigned short _sw; + + if ((_cw & FP_MSKS_FLD) != FP_MSKS_FLD) { + __fnstsw(&_sw); + if (((_sw & ~_cw) & FP_STKY_FLD) != 0) { + __fnstenv(&_env); + _env._cw = _newcw; + __fldenv(&_env); + return; + } + } + __fldcw(&_newcw); +} + +static __inline fp_rnd_t +fpgetround(void) +{ + unsigned short _cw; + + __fnstcw(&_cw); + return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF)); +} + +static __inline fp_rnd_t +fpsetround(fp_rnd_t _m) +{ + fp_rnd_t _p; + unsigned short _cw, _newcw; + + __fnstcw(&_cw); + _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF); + _newcw = _cw & ~FP_RND_FLD; + _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD; + __fnldcw(_cw, _newcw); + return (_p); +} + +static __inline fp_prec_t +fpgetprec(void) +{ + unsigned short _cw; + + __fnstcw(&_cw); + return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF)); +} + +static __inline fp_prec_t +fpsetprec(fp_prec_t _m) +{ + fp_prec_t _p; + unsigned short _cw, _newcw; + + __fnstcw(&_cw); + _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF); + _newcw = _cw & ~FP_PRC_FLD; + _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD; + __fnldcw(_cw, _newcw); + return (_p); +} + +/* + * Get or set the exception mask. + * Note that the x87 mask bits are inverted by the API -- a mask bit of 1 + * means disable for x87 and SSE, but for fp*mask() it means enable. + */ + +static __inline fp_except_t +fpgetmask(void) +{ + unsigned short _cw; + + __fnstcw(&_cw); + return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF); +} + +static __inline fp_except_t +fpsetmask(fp_except_t _m) +{ + fp_except_t _p; + unsigned short _cw, _newcw; + + __fnstcw(&_cw); + _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF; + _newcw = _cw & ~FP_MSKS_FLD; + _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD; + __fnldcw(_cw, _newcw); + return (_p); +} + +static __inline fp_except_t +fpgetsticky(void) +{ + unsigned _ex; + unsigned short _sw; + + __fnstsw(&_sw); + _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF; + return ((fp_except_t)_ex); +} + +static __inline fp_except_t +fpresetsticky(fp_except_t _m) +{ + struct { + unsigned _cw; + unsigned _sw; + unsigned _other[5]; + } _env; + fp_except_t _p; + + _m &= FP_STKY_FLD >> FP_STKY_OFF; + _p = fpgetsticky(); + if ((_p & ~_m) == _p) + return (_p); + if ((_p & ~_m) == 0) { + __fnclex(); + return (_p); + } + __fnstenv(&_env); + _env._sw &= ~_m; + __fldenv(&_env); + return (_p); +} + +#endif /* __GNUCLIKE_ASM */ + +#endif /* !_MACHINE_IEEEFP_H_ */