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Linux/include/math-emu/soft-fp.h

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  1 /* 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_INVALID_SNAN
 55 #define FP_EX_INVALID_SNAN      0
 56 #endif
 57 /* inf - inf */
 58 #ifndef FP_EX_INVALID_ISI
 59 #define FP_EX_INVALID_ISI       0
 60 #endif
 61 /* inf / inf */
 62 #ifndef FP_EX_INVALID_IDI
 63 #define FP_EX_INVALID_IDI       0
 64 #endif
 65 /* 0 / 0 */
 66 #ifndef FP_EX_INVALID_ZDZ
 67 #define FP_EX_INVALID_ZDZ       0
 68 #endif
 69 /* inf * 0 */
 70 #ifndef FP_EX_INVALID_IMZ
 71 #define FP_EX_INVALID_IMZ       0
 72 #endif
 73 #ifndef FP_EX_OVERFLOW
 74 #define FP_EX_OVERFLOW          0
 75 #endif
 76 #ifndef FP_EX_UNDERFLOW
 77 #define FP_EX_UNDERFLOW         
 78 #endif
 79 #ifndef FP_EX_DIVZERO
 80 #define FP_EX_DIVZERO           0
 81 #endif
 82 #ifndef FP_EX_INEXACT
 83 #define FP_EX_INEXACT           0
 84 #endif
 85 #ifndef FP_EX_DENORM
 86 #define FP_EX_DENORM            0
 87 #endif
 88 
 89 #ifdef _FP_DECL_EX
 90 #define FP_DECL_EX                                      \
 91   int _fex = 0;                                         \
 92   _FP_DECL_EX
 93 #else
 94 #define FP_DECL_EX int _fex = 0
 95 #endif
 96   
 97 #ifndef FP_INIT_ROUNDMODE
 98 #define FP_INIT_ROUNDMODE do {} while (0)
 99 #endif
100 
101 #ifndef FP_HANDLE_EXCEPTIONS
102 #define FP_HANDLE_EXCEPTIONS do {} while (0)
103 #endif
104 
105 /* By default we never flush denormal input operands to signed zero. */
106 #ifndef FP_DENORM_ZERO
107 #define FP_DENORM_ZERO 0
108 #endif
109 
110 #ifndef FP_INHIBIT_RESULTS
111 /* By default we write the results always.
112  * sfp-machine may override this and e.g.
113  * check if some exceptions are unmasked
114  * and inhibit it in such a case.
115  */
116 #define FP_INHIBIT_RESULTS 0
117 #endif
118 
119 #ifndef FP_TRAPPING_EXCEPTIONS
120 #define FP_TRAPPING_EXCEPTIONS 0
121 #endif
122 
123 #define FP_SET_EXCEPTION(ex)                            \
124   _fex |= (ex)
125   
126 #define FP_UNSET_EXCEPTION(ex)                          \
127   _fex &= ~(ex)
128 
129 #define FP_CUR_EXCEPTIONS                               \
130   (_fex)
131 
132 #define FP_CLEAR_EXCEPTIONS                             \
133   _fex = 0
134 
135 #define _FP_ROUND_NEAREST(wc, X)                        \
136 do {                                                    \
137     if ((_FP_FRAC_LOW_##wc(X) & 15) != _FP_WORK_ROUND)  \
138       _FP_FRAC_ADDI_##wc(X, _FP_WORK_ROUND);            \
139 } while (0)
140 
141 #define _FP_ROUND_ZERO(wc, X)           (void)0
142 
143 #define _FP_ROUND_PINF(wc, X)                           \
144 do {                                                    \
145     if (!X##_s && (_FP_FRAC_LOW_##wc(X) & 7))           \
146       _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB);              \
147 } while (0)
148 
149 #define _FP_ROUND_MINF(wc, X)                           \
150 do {                                                    \
151     if (X##_s && (_FP_FRAC_LOW_##wc(X) & 7))            \
152       _FP_FRAC_ADDI_##wc(X, _FP_WORK_LSB);              \
153 } while (0)
154 
155 #define _FP_ROUND(wc, X)                        \
156 do {                                            \
157         if (_FP_FRAC_LOW_##wc(X) & 7)           \
158           FP_SET_EXCEPTION(FP_EX_INEXACT);      \
159         switch (FP_ROUNDMODE)                   \
160         {                                       \
161           case FP_RND_NEAREST:                  \
162             _FP_ROUND_NEAREST(wc,X);            \
163             break;                              \
164           case FP_RND_ZERO:                     \
165             _FP_ROUND_ZERO(wc,X);               \
166             break;                              \
167           case FP_RND_PINF:                     \
168             _FP_ROUND_PINF(wc,X);               \
169             break;                              \
170           case FP_RND_MINF:                     \
171             _FP_ROUND_MINF(wc,X);               \
172             break;                              \
173         }                                       \
174 } while (0)
175 
176 #define FP_CLS_NORMAL           0
177 #define FP_CLS_ZERO             1
178 #define FP_CLS_INF              2
179 #define FP_CLS_NAN              3
180 
181 #define _FP_CLS_COMBINE(x,y)    (((x) << 2) | (y))
182 
183 #include <math-emu/op-1.h>
184 #include <math-emu/op-2.h>
185 #include <math-emu/op-4.h>
186 #include <math-emu/op-8.h>
187 #include <math-emu/op-common.h>
188 
189 /* Sigh.  Silly things longlong.h needs.  */
190 #define UWtype          _FP_W_TYPE
191 #define W_TYPE_SIZE     _FP_W_TYPE_SIZE
192 
193 typedef int SItype __attribute__((mode(SI)));
194 typedef int DItype __attribute__((mode(DI)));
195 typedef unsigned int USItype __attribute__((mode(SI)));
196 typedef unsigned int UDItype __attribute__((mode(DI)));
197 #if _FP_W_TYPE_SIZE == 32
198 typedef unsigned int UHWtype __attribute__((mode(HI)));
199 #elif _FP_W_TYPE_SIZE == 64
200 typedef USItype UHWtype;
201 #endif
202 
203 #ifndef umul_ppmm
204 #include <stdlib/longlong.h>
205 #endif
206 
207 #endif /* __MATH_EMU_SOFT_FP_H__ */
208 

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