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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Software floating-point emulation.
2 Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Richard Henderson (rth@cygnus.com),
5 Jakub Jelinek (jj@ultra.linux.cz),
6 David S. Miller (davem@redhat.com) and
7 Peter Maydell (pmaydell@chiark.greenend.org.uk).
8
9 The GNU C Library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Library General Public License as
11 published by the Free Software Foundation; either version 2 of the
12 License, or (at your option) any later version.
13
14 The GNU C Library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Library General Public License for more details.
18
19 You should have received a copy of the GNU Library General Public
20 License along with the GNU C Library; see the file COPYING.LIB. If
21 not, write to the Free Software Foundation, Inc.,
22 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
23
24#ifndef __MATH_EMU_SOFT_FP_H__
25#define __MATH_EMU_SOFT_FP_H__
26
27#include <asm/sfp-machine.h>
28
29/* Allow sfp-machine to have its own byte order definitions. */
30#ifndef __BYTE_ORDER
31#include <endian.h>
32#endif
33
34#define _FP_WORKBITS 3
35#define _FP_WORK_LSB ((_FP_W_TYPE)1 << 3)
36#define _FP_WORK_ROUND ((_FP_W_TYPE)1 << 2)
37#define _FP_WORK_GUARD ((_FP_W_TYPE)1 << 1)
38#define _FP_WORK_STICKY ((_FP_W_TYPE)1 << 0)
39
40#ifndef FP_RND_NEAREST
41# define FP_RND_NEAREST 0
42# define FP_RND_ZERO 1
43# define FP_RND_PINF 2
44# define FP_RND_MINF 3
45#ifndef FP_ROUNDMODE
46# define FP_ROUNDMODE FP_RND_NEAREST
47#endif
48#endif
49
50/* By default don't care about exceptions. */
51#ifndef FP_EX_INVALID
52#define FP_EX_INVALID 0
53#endif
54#ifndef FP_EX_OVERFLOW
55#define FP_EX_OVERFLOW 0
56#endif
57#ifndef FP_EX_UNDERFLOW
58#define FP_EX_UNDERFLOW
59#endif
60#ifndef FP_EX_DIVZERO
61#define FP_EX_DIVZERO 0
62#endif
63#ifndef FP_EX_INEXACT
64#define FP_EX_INEXACT 0
65#endif
66#ifndef FP_EX_DENORM
67#define FP_EX_DENORM 0
68#endif
69
70#ifdef _FP_DECL_EX
71#define FP_DECL_EX \
72 int _fex = 0; \
73 _FP_DECL_EX
74#else
75#define FP_DECL_EX int _fex = 0
76#endif
77
78#ifndef FP_INIT_ROUNDMODE
79#define FP_INIT_ROUNDMODE do {} while (0)
80#endif
81
82#ifndef FP_HANDLE_EXCEPTIONS
83#define FP_HANDLE_EXCEPTIONS do {} while (0)
84#endif
85
86/* By default we never flush denormal input operands to signed zero. */
87#ifndef FP_DENORM_ZERO
88#define FP_DENORM_ZERO 0
89#endif
90
91#ifndef FP_INHIBIT_RESULTS
92/* By default we write the results always.
93 * sfp-machine may override this and e.g.
94 * check if some exceptions are unmasked
95 * and inhibit it in such a case.
96 */
97#define FP_INHIBIT_RESULTS 0
98#endif
99
100#define FP_SET_EXCEPTION(ex) \
101 _fex |= (ex)
102
103#define FP_UNSET_EXCEPTION(ex) \
104 _fex &= ~(ex)
105
106#define FP_CLEAR_EXCEPTIONS \
107 _fex = 0
108
109#define _FP_ROUND_NEAREST(wc, X) \
110do { \
111 if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \
112 _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND); \
113} while (0)
114
115#define _FP_ROUND_ZERO(wc, X) 0
116
117#define _FP_ROUND_PINF(wc, X) \
118do { \
119 if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
120 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
121} while (0)
122
123#define _FP_ROUND_MINF(wc, X) \
124do { \
125 if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
126 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
127} while (0)
128
129#define _FP_ROUND(wc, X) \
130do { \
131 if (_FP_FRAC_LOW_##wc(X) & 7) \
132 FP_SET_EXCEPTION(FP_EX_INEXACT); \
133 switch (FP_ROUNDMODE) \
134 { \
135 case FP_RND_NEAREST: \
136 _FP_ROUND_NEAREST(wc,X); \
137 break; \
138 case FP_RND_ZERO: \
139 _FP_ROUND_ZERO(wc,X); \
140 break; \
141 case FP_RND_PINF: \
142 _FP_ROUND_PINF(wc,X); \
143 break; \
144 case FP_RND_MINF: \
145 _FP_ROUND_MINF(wc,X); \
146 break; \
147 } \
148} while (0)
149
150#define FP_CLS_NORMAL 0
151#define FP_CLS_ZERO 1
152#define FP_CLS_INF 2
153#define FP_CLS_NAN 3
154
155#define _FP_CLS_COMBINE(x,y) (((x) << 2) | (y))
156
157#include <math-emu/op-1.h>
158#include <math-emu/op-2.h>
159#include <math-emu/op-4.h>
160#include <math-emu/op-8.h>
161#include <math-emu/op-common.h>
162
163/* Sigh. Silly things longlong.h needs. */
164#define UWtype _FP_W_TYPE
165#define W_TYPE_SIZE _FP_W_TYPE_SIZE
166
167typedef int SItype __attribute__((mode(SI)));
168typedef int DItype __attribute__((mode(DI)));
169typedef unsigned int USItype __attribute__((mode(SI)));
170typedef unsigned int UDItype __attribute__((mode(DI)));
171#if _FP_W_TYPE_SIZE == 32
172typedef unsigned int UHWtype __attribute__((mode(HI)));
173#elif _FP_W_TYPE_SIZE == 64
174typedef USItype UHWtype;
175#endif
176
177#ifndef umul_ppmm
178#include <stdlib/longlong.h>
179#endif
180
181#endif /* __MATH_EMU_SOFT_FP_H__ */