| 1 | /*-
|
|---|
| 2 | * Copyright (c) 1990 Andrew Moore, Talke Studio
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | * 1. Redistributions of source code must retain the above copyright
|
|---|
| 9 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 10 | * 2. Redistributions in binary form must reproduce the above copyright
|
|---|
| 11 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 12 | * documentation and/or other materials provided with the distribution.
|
|---|
| 13 | * 3. All advertising materials mentioning features or use of this software
|
|---|
| 14 | * must display the following acknowledgement:
|
|---|
| 15 | * This product includes software developed by the University of
|
|---|
| 16 | * California, Berkeley and its contributors.
|
|---|
| 17 | * 4. Neither the name of the University nor the names of its contributors
|
|---|
| 18 | * may be used to endorse or promote products derived from this software
|
|---|
| 19 | * without specific prior written permission.
|
|---|
| 20 | *
|
|---|
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|---|
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|---|
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|---|
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|---|
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|---|
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|---|
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|---|
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|---|
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|---|
| 31 | * SUCH DAMAGE.
|
|---|
| 32 | *
|
|---|
| 33 | * from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93
|
|---|
| 34 | * $FreeBSD: src/sys/i386/include/ieeefp.h,v 1.8 2003/01/19 06:01:33 marcel Exp $
|
|---|
| 35 | */
|
|---|
| 36 | /** @file
|
|---|
| 37 | * FreeBSD 5.1
|
|---|
| 38 | */
|
|---|
| 39 |
|
|---|
| 40 | /*
|
|---|
| 41 | * IEEE floating point type and constant definitions.
|
|---|
| 42 | */
|
|---|
| 43 |
|
|---|
| 44 | #ifndef _MACHINE_IEEEFP_H_
|
|---|
| 45 | #define _MACHINE_IEEEFP_H_
|
|---|
| 46 |
|
|---|
| 47 | /*
|
|---|
| 48 | * FP rounding modes
|
|---|
| 49 | */
|
|---|
| 50 | typedef enum {
|
|---|
| 51 | FP_RN=0, /* round to nearest */
|
|---|
| 52 | FP_RM, /* round down to minus infinity */
|
|---|
| 53 | FP_RP, /* round up to plus infinity */
|
|---|
| 54 | FP_RZ /* truncate */
|
|---|
| 55 | } fp_rnd_t;
|
|---|
| 56 |
|
|---|
| 57 | /*
|
|---|
| 58 | * FP precision modes
|
|---|
| 59 | */
|
|---|
| 60 | typedef enum {
|
|---|
| 61 | FP_PS=0, /* 24 bit (single-precision) */
|
|---|
| 62 | FP_PRS, /* reserved */
|
|---|
| 63 | FP_PD, /* 53 bit (double-precision) */
|
|---|
| 64 | FP_PE /* 64 bit (extended-precision) */
|
|---|
| 65 | } fp_prec_t;
|
|---|
| 66 |
|
|---|
| 67 | #define fp_except_t int
|
|---|
| 68 |
|
|---|
| 69 | /*
|
|---|
| 70 | * FP exception masks
|
|---|
| 71 | */
|
|---|
| 72 | #define FP_X_INV 0x01 /* invalid operation */
|
|---|
| 73 | #define FP_X_DNML 0x02 /* denormal */
|
|---|
| 74 | #define FP_X_DZ 0x04 /* zero divide */
|
|---|
| 75 | #define FP_X_OFL 0x08 /* overflow */
|
|---|
| 76 | #define FP_X_UFL 0x10 /* underflow */
|
|---|
| 77 | #define FP_X_IMP 0x20 /* (im)precision */
|
|---|
| 78 | #define FP_X_STK 0x40 /* stack fault */
|
|---|
| 79 |
|
|---|
| 80 | /*
|
|---|
| 81 | * FP registers
|
|---|
| 82 | */
|
|---|
| 83 | #define FP_MSKS_REG 0 /* exception masks */
|
|---|
| 84 | #define FP_PRC_REG 0 /* precision */
|
|---|
| 85 | #define FP_RND_REG 0 /* direction */
|
|---|
| 86 | #define FP_STKY_REG 1 /* sticky flags */
|
|---|
| 87 |
|
|---|
| 88 | /*
|
|---|
| 89 | * FP register bit field masks
|
|---|
| 90 | */
|
|---|
| 91 | #define FP_MSKS_FLD 0x3f /* exception masks field */
|
|---|
| 92 | #define FP_PRC_FLD 0x300 /* precision control field */
|
|---|
| 93 | #define FP_RND_FLD 0xc00 /* round control field */
|
|---|
| 94 | #define FP_STKY_FLD 0x3f /* sticky flags field */
|
|---|
| 95 |
|
|---|
| 96 | /*
|
|---|
| 97 | * FP register bit field offsets
|
|---|
| 98 | */
|
|---|
| 99 | #define FP_MSKS_OFF 0 /* exception masks offset */
|
|---|
| 100 | #define FP_PRC_OFF 8 /* precision control offset */
|
|---|
| 101 | #define FP_RND_OFF 10 /* round control offset */
|
|---|
| 102 | #define FP_STKY_OFF 0 /* sticky flags offset */
|
|---|
| 103 |
|
|---|
| 104 | #ifdef __GNUC__
|
|---|
| 105 |
|
|---|
| 106 | #define __fldenv(addr) __asm __volatile("fldenv %0" : : "m" (*(addr)))
|
|---|
| 107 | #define __fnstenv(addr) __asm __volatile("fnstenv %0" : "=m" (*(addr)))
|
|---|
| 108 | #define __fnstcw(addr) __asm __volatile("fnstcw %0" : "=m" (*(addr)))
|
|---|
| 109 | #define __fnstsw(addr) __asm __volatile("fnstsw %0" : "=m" (*(addr)))
|
|---|
| 110 |
|
|---|
| 111 | /*
|
|---|
| 112 | * return the contents of a FP register
|
|---|
| 113 | */
|
|---|
| 114 | static __inline__ int
|
|---|
| 115 | __fpgetreg(int _reg)
|
|---|
| 116 | {
|
|---|
| 117 | unsigned short _mem;
|
|---|
| 118 |
|
|---|
| 119 | /*-
|
|---|
| 120 | * This is more efficient than it looks. The switch gets optimized
|
|---|
| 121 | * away if _reg is constant.
|
|---|
| 122 | *
|
|---|
| 123 | * The default case only supports _reg == 0. We could handle more
|
|---|
| 124 | * registers (e.g., tags) using fnstenv, but the interface doesn't
|
|---|
| 125 | * support more.
|
|---|
| 126 | */
|
|---|
| 127 | switch(_reg) {
|
|---|
| 128 | default:
|
|---|
| 129 | __fnstcw(&_mem);
|
|---|
| 130 | break;
|
|---|
| 131 | case FP_STKY_REG:
|
|---|
| 132 | __fnstsw(&_mem);
|
|---|
| 133 | break;
|
|---|
| 134 | }
|
|---|
| 135 | return _mem;
|
|---|
| 136 | }
|
|---|
| 137 |
|
|---|
| 138 | /*
|
|---|
| 139 | * set a FP mode; return previous mode
|
|---|
| 140 | */
|
|---|
| 141 | static __inline__ int
|
|---|
| 142 | __fpsetreg(int _m, int _reg, int _fld, int _off)
|
|---|
| 143 | {
|
|---|
| 144 | unsigned _env[7];
|
|---|
| 145 | unsigned _p;
|
|---|
| 146 |
|
|---|
| 147 | /*
|
|---|
| 148 | * _reg == 0 could be handled better using fnstcw/fldcw.
|
|---|
| 149 | */
|
|---|
| 150 | __fnstenv(_env);
|
|---|
| 151 | _p = (_env[_reg] & _fld) >> _off;
|
|---|
| 152 | _env[_reg] = (_env[_reg] & ~_fld) | (_m << _off & _fld);
|
|---|
| 153 | __fldenv(_env);
|
|---|
| 154 | return _p;
|
|---|
| 155 | }
|
|---|
| 156 |
|
|---|
| 157 | #endif /* __GNUC__ */
|
|---|
| 158 |
|
|---|
| 159 | /*
|
|---|
| 160 | * SysV/386 FP control interface
|
|---|
| 161 | */
|
|---|
| 162 | #define fpgetround() ((fp_rnd_t) \
|
|---|
| 163 | ((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF))
|
|---|
| 164 | #define fpsetround(m) ((fp_rnd_t) \
|
|---|
| 165 | __fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF))
|
|---|
| 166 | #define fpgetprec() ((fp_prec_t) \
|
|---|
| 167 | ((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF))
|
|---|
| 168 | #define fpsetprec(m) ((fp_prec_t) \
|
|---|
| 169 | __fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF))
|
|---|
| 170 | #define fpgetmask() ((fp_except_t) \
|
|---|
| 171 | ((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF))
|
|---|
| 172 | #define fpsetmask(m) ((fp_except_t) \
|
|---|
| 173 | (~__fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF)) & \
|
|---|
| 174 | (FP_MSKS_FLD >> FP_MSKS_OFF))
|
|---|
| 175 | #define fpgetsticky() ((fp_except_t) \
|
|---|
| 176 | ((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF))
|
|---|
| 177 | #define fpresetsticky(m) ((fp_except_t) \
|
|---|
| 178 | __fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF))
|
|---|
| 179 | #define fpsetsticky(m) fpresetsticky(m)
|
|---|
| 180 |
|
|---|
| 181 | /* Suppress prototypes in the MI header. */
|
|---|
| 182 | #define _IEEEFP_INLINED_ 1
|
|---|
| 183 |
|
|---|
| 184 | #endif /* !_MACHINE_IEEEFP_H_ */
|
|---|
