1 /* Software floating-point emulation.
2 Copyright (C) 1997,1998,1999,2000,2002,2003,2005,2006
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5 Contributed by Richard Henderson (rth@cygnus.com),
6 Jakub Jelinek (jj@ultra.linux.cz),
7 David S. Miller (davem@redhat.com) and
8 Peter Maydell (pmaydell@chiark.greenend.org.uk).
10 The GNU C Library is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Lesser General Public
12 License as published by the Free Software Foundation; either
13 version 2.1 of the License, or (at your option) any later version.
15 The GNU C Library is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public
21 License along with the GNU C Library; if not, write to the Free
22 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
29 #include <sfp-machine.h>
31 #include "sfp-machine.h"
34 /* Allow sfp-machine to have its own byte order definitions. */
39 #error "endianness not defined by sfp-machine.h"
43 #define _FP_WORKBITS 3
44 #define _FP_WORK_LSB ((_FP_W_TYPE)1 << 3)
45 #define _FP_WORK_ROUND ((_FP_W_TYPE)1 << 2)
46 #define _FP_WORK_GUARD ((_FP_W_TYPE)1 << 1)
47 #define _FP_WORK_STICKY ((_FP_W_TYPE)1 << 0)
49 #ifndef FP_RND_NEAREST
50 # define FP_RND_NEAREST 0
51 # define FP_RND_ZERO 1
52 # define FP_RND_PINF 2
53 # define FP_RND_MINF 3
56 # define FP_ROUNDMODE FP_RND_NEAREST
59 /* By default don't care about exceptions. */
61 #define FP_EX_INVALID 0
63 #ifndef FP_EX_OVERFLOW
64 #define FP_EX_OVERFLOW 0
66 #ifndef FP_EX_UNDERFLOW
67 #define FP_EX_UNDERFLOW 0
70 #define FP_EX_DIVZERO 0
73 #define FP_EX_INEXACT 0
76 #define FP_EX_DENORM 0
84 #define FP_DECL_EX int _fex = 0
87 #ifndef FP_INIT_ROUNDMODE
88 #define FP_INIT_ROUNDMODE do {} while (0)
91 #ifndef FP_HANDLE_EXCEPTIONS
92 #define FP_HANDLE_EXCEPTIONS do {} while (0)
95 #ifndef FP_INHIBIT_RESULTS
96 /* By default we write the results always.
97 * sfp-machine may override this and e.g.
98 * check if some exceptions are unmasked
99 * and inhibit it in such a case.
101 #define FP_INHIBIT_RESULTS 0
104 #define FP_SET_EXCEPTION(ex) \
107 #define FP_UNSET_EXCEPTION(ex) \
110 #define FP_CLEAR_EXCEPTIONS \
113 #define _FP_ROUND_NEAREST(wc, X) \
115 if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND) \
116 _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND); \
119 #define _FP_ROUND_ZERO(wc, X) (void)0
121 #define _FP_ROUND_PINF(wc, X) \
123 if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
124 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
127 #define _FP_ROUND_MINF(wc, X) \
129 if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7)) \
130 _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB); \
133 #define _FP_ROUND(wc, X) \
135 if (_FP_FRAC_LOW_##wc(X) & 7) \
136 FP_SET_EXCEPTION(FP_EX_INEXACT); \
137 switch (FP_ROUNDMODE) \
139 case FP_RND_NEAREST: \
140 _FP_ROUND_NEAREST(wc,X); \
143 _FP_ROUND_ZERO(wc,X); \
146 _FP_ROUND_PINF(wc,X); \
149 _FP_ROUND_MINF(wc,X); \
154 #define FP_CLS_NORMAL 0
155 #define FP_CLS_ZERO 1
159 #define _FP_CLS_COMBINE(x,y) (((x) << 2) | (y))
165 #include "op-common.h"
167 /* Sigh. Silly things longlong.h needs. */
168 #define UWtype _FP_W_TYPE
169 #define W_TYPE_SIZE _FP_W_TYPE_SIZE
171 typedef int QItype
__attribute__((mode(QI
)));
172 typedef int SItype
__attribute__((mode(SI
)));
173 typedef int DItype
__attribute__((mode(DI
)));
174 typedef unsigned int UQItype
__attribute__((mode(QI
)));
175 typedef unsigned int USItype
__attribute__((mode(SI
)));
176 typedef unsigned int UDItype
__attribute__((mode(DI
)));
177 #if _FP_W_TYPE_SIZE == 32
178 typedef unsigned int UHWtype
__attribute__((mode(HI
)));
179 #elif _FP_W_TYPE_SIZE == 64
180 typedef USItype UHWtype
;
183 #define SI_BITS (__CHAR_BIT__ * (int)sizeof(SItype))
184 #define DI_BITS (__CHAR_BIT__ * (int)sizeof(DItype))
188 #include <stdlib/longlong.h>
190 #include "longlong.h"
197 extern void abort (void);