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[glibc.git] / soft-fp / soft-fp.h
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1 /* Software floating-point emulation.
2 Copyright (C) 1997-2013 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).
9 The GNU C Library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
14 In addition to the permissions in the GNU Lesser General Public
15 License, the Free Software Foundation gives you unlimited
16 permission to link the compiled version of this file into
17 combinations with other programs, and to distribute those
18 combinations without any restriction coming from the use of this
19 file. (The Lesser General Public License restrictions do apply in
20 other respects; for example, they cover modification of the file,
21 and distribution when not linked into a combine executable.)
23 The GNU C Library is distributed in the hope that it will be useful,
24 but WITHOUT ANY WARRANTY; without even the implied warranty of
25 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
26 Lesser General Public License for more details.
28 You should have received a copy of the GNU Lesser General Public
29 License along with the GNU C Library; if not, see
30 <http://www.gnu.org/licenses/>. */
32 #ifndef SOFT_FP_H
33 #define SOFT_FP_H
35 #ifdef _LIBC
36 #include <sfp-machine.h>
37 #else
38 #include "sfp-machine.h"
39 #endif
41 /* Allow sfp-machine to have its own byte order definitions. */
42 #ifndef __BYTE_ORDER
43 #ifdef _LIBC
44 #include <endian.h>
45 #else
46 #error "endianness not defined by sfp-machine.h"
47 #endif
48 #endif
50 #define _FP_WORKBITS 3
51 #define _FP_WORK_LSB ((_FP_W_TYPE)1 << 3)
52 #define _FP_WORK_ROUND ((_FP_W_TYPE)1 << 2)
53 #define _FP_WORK_GUARD ((_FP_W_TYPE)1 << 1)
54 #define _FP_WORK_STICKY ((_FP_W_TYPE)1 << 0)
56 #ifndef FP_RND_NEAREST
57 # define FP_RND_NEAREST 0
58 # define FP_RND_ZERO 1
59 # define FP_RND_PINF 2
60 # define FP_RND_MINF 3
61 #endif
62 #ifndef FP_ROUNDMODE
63 # define FP_ROUNDMODE FP_RND_NEAREST
64 #endif
66 /* By default don't care about exceptions. */
67 #ifndef FP_EX_INVALID
68 #define FP_EX_INVALID 0
69 #endif
70 #ifndef FP_EX_OVERFLOW
71 #define FP_EX_OVERFLOW 0
72 #endif
73 #ifndef FP_EX_UNDERFLOW
74 #define FP_EX_UNDERFLOW 0
75 #endif
76 #ifndef FP_EX_DIVZERO
77 #define FP_EX_DIVZERO 0
78 #endif
79 #ifndef FP_EX_INEXACT
80 #define FP_EX_INEXACT 0
81 #endif
82 #ifndef FP_EX_DENORM
83 #define FP_EX_DENORM 0
84 #endif
86 /* _FP_STRUCT_LAYOUT may be defined as an attribute to determine the
87 struct layout variant used for structures where bit-fields are used
88 to access specific parts of binary floating-point numbers. This is
89 required for systems where the default ABI uses struct layout with
90 differences in how consecutive bit-fields are laid out from the
91 default expected by soft-fp. */
92 #ifndef _FP_STRUCT_LAYOUT
93 #define _FP_STRUCT_LAYOUT
94 #endif
96 #ifdef _FP_DECL_EX
97 #define FP_DECL_EX \
98 int _fex = 0; \
99 _FP_DECL_EX
100 #else
101 #define FP_DECL_EX int _fex = 0
102 #endif
104 #ifndef FP_INIT_ROUNDMODE
105 #define FP_INIT_ROUNDMODE do {} while (0)
106 #endif
108 #ifndef FP_HANDLE_EXCEPTIONS
109 #define FP_HANDLE_EXCEPTIONS do {} while (0)
110 #endif
112 #ifndef FP_INHIBIT_RESULTS
113 /* By default we write the results always.
114 * sfp-machine may override this and e.g.
115 * check if some exceptions are unmasked
116 * and inhibit it in such a case.
118 #define FP_INHIBIT_RESULTS 0
119 #endif
121 #define FP_SET_EXCEPTION(ex) \
122 _fex |= (ex)
124 #define FP_UNSET_EXCEPTION(ex) \
125 _fex &= ~(ex)
127 #define FP_CLEAR_EXCEPTIONS \
128 _fex = 0
130 #define FP_CUR_EXCEPTIONS \
131 (_fex)
133 #ifndef FP_TRAPPING_EXCEPTIONS
134 #define FP_TRAPPING_EXCEPTIONS 0
135 #endif
137 #define _FP_ROUND_NEAREST(wc, X) \
138 do { \
139 if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \
140 _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND); \
141 } while (0)
143 #define _FP_ROUND_ZERO(wc, X) (void)0
145 #define _FP_ROUND_PINF(wc, X) \
146 do { \
147 if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
148 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
149 } while (0)
151 #define _FP_ROUND_MINF(wc, X) \
152 do { \
153 if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
154 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
155 } while (0)
157 #define _FP_ROUND(wc, X) \
158 do { \
159 if (_FP_FRAC_LOW_##wc(X) & 7) \
161 FP_SET_EXCEPTION(FP_EX_INEXACT); \
162 switch (FP_ROUNDMODE) \
164 case FP_RND_NEAREST: \
165 _FP_ROUND_NEAREST(wc,X); \
166 break; \
167 case FP_RND_ZERO: \
168 _FP_ROUND_ZERO(wc,X); \
169 break; \
170 case FP_RND_PINF: \
171 _FP_ROUND_PINF(wc,X); \
172 break; \
173 case FP_RND_MINF: \
174 _FP_ROUND_MINF(wc,X); \
175 break; \
178 } while (0)
180 #define FP_CLS_NORMAL 0
181 #define FP_CLS_ZERO 1
182 #define FP_CLS_INF 2
183 #define FP_CLS_NAN 3
185 #define _FP_CLS_COMBINE(x,y) (((x) << 2) | (y))
187 #include "op-1.h"
188 #include "op-2.h"
189 #include "op-4.h"
190 #include "op-8.h"
191 #include "op-common.h"
193 /* Sigh. Silly things longlong.h needs. */
194 #define UWtype _FP_W_TYPE
195 #define W_TYPE_SIZE _FP_W_TYPE_SIZE
197 typedef int QItype __attribute__((mode(QI)));
198 typedef int SItype __attribute__((mode(SI)));
199 typedef int DItype __attribute__((mode(DI)));
200 typedef unsigned int UQItype __attribute__((mode(QI)));
201 typedef unsigned int USItype __attribute__((mode(SI)));
202 typedef unsigned int UDItype __attribute__((mode(DI)));
203 #if _FP_W_TYPE_SIZE == 32
204 typedef unsigned int UHWtype __attribute__((mode(HI)));
205 #elif _FP_W_TYPE_SIZE == 64
206 typedef USItype UHWtype;
207 #endif
209 #ifndef CMPtype
210 #define CMPtype int
211 #endif
213 #define SI_BITS (__CHAR_BIT__ * (int)sizeof(SItype))
214 #define DI_BITS (__CHAR_BIT__ * (int)sizeof(DItype))
216 #ifndef umul_ppmm
217 #ifdef _LIBC
218 #include <stdlib/longlong.h>
219 #else
220 #include "longlong.h"
221 #endif
222 #endif
224 #ifdef _LIBC
225 #include <stdlib.h>
226 #else
227 extern void abort (void);
228 #endif
230 #endif