98a80542e7
functions haven't been cleaned up here because the amd64 cleanups don't apply directly and the functions here will be merged or rewritten later.
195 lines
5.8 KiB
C
195 lines
5.8 KiB
C
/*-
|
|
* 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_
|
|
|
|
/*
|
|
* IEEE floating point type, constant and function definitions.
|
|
* XXX: FP*FLD, FP*REG 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 and status register numbers (indexes into the env array).
|
|
*/
|
|
#define FP_MSKS_REG 0 /* exception masks */
|
|
#define FP_PRC_REG 0 /* precision */
|
|
#define FP_RND_REG 0 /* direction */
|
|
#define FP_STKY_REG 1 /* sticky flags */
|
|
|
|
/*
|
|
* 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 __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr)))
|
|
#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)))
|
|
|
|
/*
|
|
* return the contents of a FP register
|
|
*/
|
|
static __inline__ int
|
|
__fpgetreg(int _reg)
|
|
{
|
|
unsigned short _mem;
|
|
|
|
/*-
|
|
* This is more efficient than it looks. The switch gets optimized
|
|
* away if _reg is constant.
|
|
*
|
|
* The default case only supports _reg == 0. We could handle more
|
|
* registers (e.g., tags) using fnstenv, but the interface doesn't
|
|
* support more.
|
|
*/
|
|
switch(_reg) {
|
|
default:
|
|
__fnstcw(&_mem);
|
|
break;
|
|
case FP_STKY_REG:
|
|
__fnstsw(&_mem);
|
|
break;
|
|
}
|
|
return _mem;
|
|
}
|
|
|
|
/*
|
|
* set a FP mode; return previous mode
|
|
*/
|
|
static __inline__ int
|
|
__fpsetreg(int _m, int _reg, int _fld, int _off)
|
|
{
|
|
unsigned _env[7];
|
|
unsigned _p;
|
|
|
|
/*
|
|
* _reg == 0 could be handled better using fnstcw/fldcw.
|
|
*/
|
|
__fnstenv(_env);
|
|
_p = (_env[_reg] & _fld) >> _off;
|
|
_env[_reg] = (_env[_reg] & ~_fld) | (_m << _off & _fld);
|
|
__fldenv(_env);
|
|
return _p;
|
|
}
|
|
|
|
#endif /* __GNUCLIKE_ASM */
|
|
|
|
/*
|
|
* SysV/386 FP control interface
|
|
*/
|
|
#define fpgetround() ((fp_rnd_t) \
|
|
((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF))
|
|
#define fpsetround(m) ((fp_rnd_t) \
|
|
__fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF))
|
|
#define fpgetprec() ((fp_prec_t) \
|
|
((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF))
|
|
#define fpsetprec(m) ((fp_prec_t) \
|
|
__fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF))
|
|
#define fpgetmask() ((fp_except_t) \
|
|
((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF))
|
|
#define fpsetmask(m) ((fp_except_t) \
|
|
(~__fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF)) & \
|
|
(FP_MSKS_FLD >> FP_MSKS_OFF))
|
|
#define fpgetsticky() ((fp_except_t) \
|
|
((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF))
|
|
#define fpresetsticky(m) ((fp_except_t) \
|
|
__fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF))
|
|
|
|
/* Suppress prototypes in the MI header. */
|
|
#define _IEEEFP_INLINED_ 1
|
|
|
|
#endif /* !_MACHINE_IEEEFP_H_ */
|