floatingpoint.h (3df129097bfa8c102c3118fe880388b144519f4a) floatingpoint.h (24a82630a20b64577bcc7454bec7288b1dbdb37a)
1/*-
2 * Copyright (c) 1993 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

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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 *
1/*-
2 * Copyright (c) 1993 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

--- 16 unchanged lines hidden (view full) ---

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: @(#) floatingpoint.h 1.0 (Berkeley) 9/23/93
34 * $FreeBSD$
33 * @(#) floatingpoint.h 1.0 (Berkeley) 9/23/93
35 */
36
34 */
35
36/*
37 * IEEE floating point structure and function definitions
38 */
39
37#ifndef _FLOATINGPOINT_H_
38#define _FLOATINGPOINT_H_
39
40#include <sys/cdefs.h>
40#ifndef _FLOATINGPOINT_H_
41#define _FLOATINGPOINT_H_
42
43#include <sys/cdefs.h>
41#include <machine/ieeefp.h>
44#include <sys/ieeefp.h>
42
45
46#ifdef __GNUC__
47
48#define fnstcw(addr) __asm("fnstcw %0" : "=m" (*addr) : "0" (*addr))
49#define fnstsw(addr) __asm("fnstsw %0" : "=m" (*addr) : "0" (*addr))
50#define fnstenv(addr) __asm("fnstenv %0" : "=m" (*addr) : "0" (*addr))
51#define fldenv(addr) __asm("fldenv %0" : : "m" (*addr))
52
53#ifdef __i386__
54
55/*
56 * return the contents of a FP register
57 */
58static __inline__
59__fpgetreg(reg)
60{
61 unsigned short mem;
62
63 switch(reg) {
64 default:
65 fnstcw(&mem);
66 break;
67 case FP_STKY_REG:
68 fnstsw(&mem);
69 break;
70 }
71 return mem;
72}
73
74/*
75 * set a FP mode; return previous mode
76 */
77static __inline__
78__fpsetreg(m, reg, fld, off)
79{
80 unsigned env[7];
81 unsigned p;
82
83 fnstenv(env);
84 p = (env[reg] & fld) >> off;
85 env[reg] = (env[reg] & ~fld) | (m << off & fld);
86 fldenv(env);
87 return p;
88}
89
90#endif /* __i386__ */
91
92#endif /* __GNUC__ */
93
94/*
95 * SysV/386 FP control interface
96 */
97#define fpgetround() ((__fpgetreg(FP_RND_REG) & FP_RND_FLD) >> FP_RND_OFF)
98#define fpsetround(m) __fpsetreg((m), FP_RND_REG, FP_RND_FLD, FP_RND_OFF)
99#define fpgetprec() ((__fpgetreg(FP_PRC_REG) & FP_PRC_FLD) >> FP_PRC_OFF)
100#define fpsetprec(m) __fpsetreg((m), FP_PRC_REG, FP_PRC_FLD, FP_PRC_OFF)
101#define fpgetmask() ((~__fpgetreg(FP_MSKS_REG) & FP_MSKS_FLD) >> FP_MSKS_OFF)
102#define fpsetmask(m) __fpsetreg(~(m), FP_MSKS_REG, FP_MSKS_FLD, FP_MSKS_OFF)
103#define fpgetsticky() ((__fpgetreg(FP_STKY_REG) & FP_STKY_FLD) >> FP_STKY_OFF)
104#define fpresetsticky(m) __fpsetreg(0, FP_STKY_REG, (m), FP_STKY_OFF)
105#define fpsetsticky(m) fpresetsticky(m)
106
43#endif /* !_FLOATINGPOINT_H_ */
107#endif /* !_FLOATINGPOINT_H_ */