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1/* $NetBSD: softfloat.h,v 1.10 2013/04/24 18:04:46 matt Exp $ */\r
2\r
3/* This is a derivative work. */\r
4\r
5/*\r
6===============================================================================\r
7\r
8This C header file is part of the SoftFloat IEC/IEEE Floating-point\r
9Arithmetic Package, Release 2a.\r
10\r
11Written by John R. Hauser. This work was made possible in part by the\r
12International Computer Science Institute, located at Suite 600, 1947 Center\r
13Street, Berkeley, California 94704. Funding was partially provided by the\r
14National Science Foundation under grant MIP-9311980. The original version\r
15of this code was written as part of a project to build a fixed-point vector\r
16processor in collaboration with the University of California at Berkeley,\r
17overseen by Profs. Nelson Morgan and John Wawrzynek. More information\r
18is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/\r
19arithmetic/SoftFloat.html'.\r
20\r
21THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort\r
22has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT\r
23TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO\r
24PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY\r
25AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.\r
26\r
27Derivative works are acceptable, even for commercial purposes, so long as\r
28(1) they include prominent notice that the work is derivative, and (2) they\r
29include prominent notice akin to these four paragraphs for those parts of\r
30this code that are retained.\r
31\r
32===============================================================================\r
33*/\r
34\r
35/*\r
36-------------------------------------------------------------------------------\r
37The macro `FLOATX80' must be defined to enable the extended double-precision\r
38floating-point format `floatx80'. If this macro is not defined, the\r
39`floatx80' type will not be defined, and none of the functions that either\r
40input or output the `floatx80' type will be defined. The same applies to\r
41the `FLOAT128' macro and the quadruple-precision format `float128'.\r
42-------------------------------------------------------------------------------\r
43*/\r
44/* #define FLOATX80 */\r
45/* #define FLOAT128 */\r
46\r
47#include <stdint.h>\r
48#include <machine/ieeefp.h>\r
49\r
50/*\r
51-------------------------------------------------------------------------------\r
52Software IEC/IEEE floating-point types.\r
53-------------------------------------------------------------------------------\r
54*/\r
55typedef unsigned int float32;\r
56typedef unsigned long long float64;\r
57#ifdef FLOATX80\r
58typedef struct {\r
59 unsigned short high;\r
60 unsigned long long low;\r
61} floatx80;\r
62#endif\r
63#ifdef FLOAT128\r
64typedef struct {\r
65 unsigned long long high, low;\r
66} float128;\r
67#endif\r
68\r
69/*\r
70-------------------------------------------------------------------------------\r
71Software IEC/IEEE floating-point underflow tininess-detection mode.\r
72-------------------------------------------------------------------------------\r
73*/\r
74#ifndef SOFTFLOAT_FOR_GCC\r
75extern int float_detect_tininess;\r
76#endif\r
77enum {\r
78 float_tininess_after_rounding = 0,\r
79 float_tininess_before_rounding = 1\r
80};\r
81\r
82/*\r
83-------------------------------------------------------------------------------\r
84Software IEC/IEEE floating-point rounding mode.\r
85-------------------------------------------------------------------------------\r
86*/\r
87extern fp_rnd float_rounding_mode;\r
88#define float_round_nearest_even FP_RN\r
89#define float_round_to_zero FP_RZ\r
90#define float_round_down FP_RM\r
91#define float_round_up FP_RP\r
92\r
93/*\r
94-------------------------------------------------------------------------------\r
95Software IEC/IEEE floating-point exception flags.\r
96-------------------------------------------------------------------------------\r
97*/\r
98extern fp_except float_exception_flags;\r
99extern fp_except float_exception_mask;\r
100enum {\r
101 float_flag_inexact = FP_X_IMP,\r
102 float_flag_underflow = FP_X_UFL,\r
103 float_flag_overflow = FP_X_OFL,\r
104 float_flag_divbyzero = FP_X_DZ,\r
105 float_flag_invalid = FP_X_INV\r
106};\r
107\r
108/*\r
109-------------------------------------------------------------------------------\r
110Routine to raise any or all of the software IEC/IEEE floating-point\r
111exception flags.\r
112-------------------------------------------------------------------------------\r
113*/\r
114void float_raise( fp_except );\r
115\r
116/*\r
117-------------------------------------------------------------------------------\r
118Software IEC/IEEE integer-to-floating-point conversion routines.\r
119-------------------------------------------------------------------------------\r
120*/\r
121float32 int32_to_float32( int32 );\r
122float32 uint32_to_float32( uint32 );\r
123float64 int32_to_float64( int32 );\r
124float64 uint32_to_float64( uint32 );\r
125#ifdef FLOATX80\r
126floatx80 int32_to_floatx80( int32 );\r
127floatx80 uint32_to_floatx80( uint32 );\r
128#endif\r
129#ifdef FLOAT128\r
130float128 int32_to_float128( int32 );\r
131float128 uint32_to_float128( uint32 );\r
132#endif\r
133#ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */\r
134float32 int64_to_float32( long long );\r
135float64 int64_to_float64( long long );\r
136#ifdef FLOATX80\r
137floatx80 int64_to_floatx80( long long );\r
138#endif\r
139#ifdef FLOAT128\r
140float128 int64_to_float128( long long );\r
141#endif\r
142#endif\r
143\r
144/*\r
145-------------------------------------------------------------------------------\r
146Software IEC/IEEE single-precision conversion routines.\r
147-------------------------------------------------------------------------------\r
148*/\r
149int float32_to_int32( float32 );\r
150int float32_to_int32_round_to_zero( float32 );\r
151#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)\r
152unsigned int float32_to_uint32_round_to_zero( float32 );\r
153#endif\r
154#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */\r
155long long float32_to_int64( float32 );\r
156long long float32_to_int64_round_to_zero( float32 );\r
157#endif\r
158float64 float32_to_float64( float32 );\r
159#ifdef FLOATX80\r
160floatx80 float32_to_floatx80( float32 );\r
161#endif\r
162#ifdef FLOAT128\r
163float128 float32_to_float128( float32 );\r
164#endif\r
165\r
166/*\r
167-------------------------------------------------------------------------------\r
168Software IEC/IEEE single-precision operations.\r
169-------------------------------------------------------------------------------\r
170*/\r
171float32 float32_round_to_int( float32 );\r
172float32 float32_add( float32, float32 );\r
173float32 float32_sub( float32, float32 );\r
174float32 float32_mul( float32, float32 );\r
175float32 float32_div( float32, float32 );\r
176float32 float32_rem( float32, float32 );\r
177float32 float32_sqrt( float32 );\r
178int float32_eq( float32, float32 );\r
179int float32_le( float32, float32 );\r
180int float32_lt( float32, float32 );\r
181int float32_eq_signaling( float32, float32 );\r
182int float32_le_quiet( float32, float32 );\r
183int float32_lt_quiet( float32, float32 );\r
184#ifndef SOFTFLOAT_FOR_GCC\r
185int float32_is_signaling_nan( float32 );\r
186#endif\r
187\r
188/*\r
189-------------------------------------------------------------------------------\r
190Software IEC/IEEE double-precision conversion routines.\r
191-------------------------------------------------------------------------------\r
192*/\r
193int float64_to_int32( float64 );\r
194int float64_to_int32_round_to_zero( float64 );\r
195#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)\r
196unsigned int float64_to_uint32_round_to_zero( float64 );\r
197#endif\r
198#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */\r
199long long float64_to_int64( float64 );\r
200long long float64_to_int64_round_to_zero( float64 );\r
201#endif\r
202float32 float64_to_float32( float64 );\r
203#ifdef FLOATX80\r
204floatx80 float64_to_floatx80( float64 );\r
205#endif\r
206#ifdef FLOAT128\r
207float128 float64_to_float128( float64 );\r
208#endif\r
209\r
210/*\r
211-------------------------------------------------------------------------------\r
212Software IEC/IEEE double-precision operations.\r
213-------------------------------------------------------------------------------\r
214*/\r
215float64 float64_round_to_int( float64 );\r
216float64 float64_add( float64, float64 );\r
217float64 float64_sub( float64, float64 );\r
218float64 float64_mul( float64, float64 );\r
219float64 float64_div( float64, float64 );\r
220float64 float64_rem( float64, float64 );\r
221float64 float64_sqrt( float64 );\r
222int float64_eq( float64, float64 );\r
223int float64_le( float64, float64 );\r
224int float64_lt( float64, float64 );\r
225int float64_eq_signaling( float64, float64 );\r
226int float64_le_quiet( float64, float64 );\r
227int float64_lt_quiet( float64, float64 );\r
228#ifndef SOFTFLOAT_FOR_GCC\r
229int float64_is_signaling_nan( float64 );\r
230#endif\r
231\r
232#ifdef FLOATX80\r
233\r
234/*\r
235-------------------------------------------------------------------------------\r
236Software IEC/IEEE extended double-precision conversion routines.\r
237-------------------------------------------------------------------------------\r
238*/\r
239int floatx80_to_int32( floatx80 );\r
240int floatx80_to_int32_round_to_zero( floatx80 );\r
241long long floatx80_to_int64( floatx80 );\r
242long long floatx80_to_int64_round_to_zero( floatx80 );\r
243float32 floatx80_to_float32( floatx80 );\r
244float64 floatx80_to_float64( floatx80 );\r
245#ifdef FLOAT128\r
246float128 floatx80_to_float128( floatx80 );\r
247#endif\r
248\r
249/*\r
250-------------------------------------------------------------------------------\r
251Software IEC/IEEE extended double-precision rounding precision. Valid\r
252values are 32, 64, and 80.\r
253-------------------------------------------------------------------------------\r
254*/\r
255extern int floatx80_rounding_precision;\r
256\r
257/*\r
258-------------------------------------------------------------------------------\r
259Software IEC/IEEE extended double-precision operations.\r
260-------------------------------------------------------------------------------\r
261*/\r
262floatx80 floatx80_round_to_int( floatx80 );\r
263floatx80 floatx80_add( floatx80, floatx80 );\r
264floatx80 floatx80_sub( floatx80, floatx80 );\r
265floatx80 floatx80_mul( floatx80, floatx80 );\r
266floatx80 floatx80_div( floatx80, floatx80 );\r
267floatx80 floatx80_rem( floatx80, floatx80 );\r
268floatx80 floatx80_sqrt( floatx80 );\r
269int floatx80_eq( floatx80, floatx80 );\r
270int floatx80_le( floatx80, floatx80 );\r
271int floatx80_lt( floatx80, floatx80 );\r
272int floatx80_eq_signaling( floatx80, floatx80 );\r
273int floatx80_le_quiet( floatx80, floatx80 );\r
274int floatx80_lt_quiet( floatx80, floatx80 );\r
275int floatx80_is_signaling_nan( floatx80 );\r
276\r
277#endif\r
278\r
279#ifdef FLOAT128\r
280\r
281/*\r
282-------------------------------------------------------------------------------\r
283Software IEC/IEEE quadruple-precision conversion routines.\r
284-------------------------------------------------------------------------------\r
285*/\r
286int float128_to_int32( float128 );\r
287int float128_to_int32_round_to_zero( float128 );\r
288long long float128_to_int64( float128 );\r
289long long float128_to_int64_round_to_zero( float128 );\r
290float32 float128_to_float32( float128 );\r
291float64 float128_to_float64( float128 );\r
292#ifdef FLOATX80\r
293floatx80 float128_to_floatx80( float128 );\r
294#endif\r
295\r
296/*\r
297-------------------------------------------------------------------------------\r
298Software IEC/IEEE quadruple-precision operations.\r
299-------------------------------------------------------------------------------\r
300*/\r
301float128 float128_round_to_int( float128 );\r
302float128 float128_add( float128, float128 );\r
303float128 float128_sub( float128, float128 );\r
304float128 float128_mul( float128, float128 );\r
305float128 float128_div( float128, float128 );\r
306float128 float128_rem( float128, float128 );\r
307float128 float128_sqrt( float128 );\r
308int float128_eq( float128, float128 );\r
309int float128_le( float128, float128 );\r
310int float128_lt( float128, float128 );\r
311int float128_eq_signaling( float128, float128 );\r
312int float128_le_quiet( float128, float128 );\r
313int float128_lt_quiet( float128, float128 );\r
314int float128_is_signaling_nan( float128 );\r
315\r
316#endif\r