1/*	$NetBSD: softfloat.h,v 1.4 2011/07/04 08:02:34 matt Exp $	*/
2
3/* This is a derivative work. */
4
5/*
6===============================================================================
7
8This C header file is part of the SoftFloat IEC/IEEE Floating-point
9Arithmetic Package, Release 2a.
10
11Written by John R. Hauser.  This work was made possible in part by the
12International Computer Science Institute, located at Suite 600, 1947 Center
13Street, Berkeley, California 94704.  Funding was partially provided by the
14National Science Foundation under grant MIP-9311980.  The original version
15of this code was written as part of a project to build a fixed-point vector
16processor in collaboration with the University of California at Berkeley,
17overseen by Profs. Nelson Morgan and John Wawrzynek.  More information
18is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
19arithmetic/SoftFloat.html'.
20
21THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort
22has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
23TIMES RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO
24PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
25AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
26
27Derivative works are acceptable, even for commercial purposes, so long as
28(1) they include prominent notice that the work is derivative, and (2) they
29include prominent notice akin to these four paragraphs for those parts of
30this code that are retained.
31
32===============================================================================
33*/
34
35/*
36-------------------------------------------------------------------------------
37The macro `FLOATX80' must be defined to enable the extended double-precision
38floating-point format `floatx80'.  If this macro is not defined, the
39`floatx80' type will not be defined, and none of the functions that either
40input or output the `floatx80' type will be defined.  The same applies to
41the `FLOAT128' macro and the quadruple-precision format `float128'.
42-------------------------------------------------------------------------------
43*/
44/* #define FLOATX80 */
45#if defined(__mips_n32) || defined(__mips_n64)
46#define FLOAT128
47#endif
48
49#include <machine/ieeefp.h>
50
51/*
52-------------------------------------------------------------------------------
53Software IEC/IEEE floating-point types.
54-------------------------------------------------------------------------------
55*/
56typedef unsigned int float32;
57typedef unsigned long long float64;
58#ifdef FLOATX80
59typedef struct {
60    unsigned short high;
61    unsigned long long low;
62} floatx80;
63#endif
64#ifdef FLOAT128
65typedef struct {
66    unsigned long long high, low;
67} float128;
68#endif
69
70/*
71-------------------------------------------------------------------------------
72Software IEC/IEEE floating-point underflow tininess-detection mode.
73-------------------------------------------------------------------------------
74*/
75#ifndef SOFTFLOAT_FOR_GCC
76extern int float_detect_tininess;
77#endif
78enum {
79    float_tininess_after_rounding  = 0,
80    float_tininess_before_rounding = 1
81};
82
83/*
84-------------------------------------------------------------------------------
85Software IEC/IEEE floating-point rounding mode.
86-------------------------------------------------------------------------------
87*/
88extern fp_rnd float_rounding_mode;
89#define float_round_nearest_even	FP_RN
90#define float_round_to_zero		FP_RZ
91#define float_round_down		FP_RM
92#define float_round_up			FP_RP
93
94/*
95-------------------------------------------------------------------------------
96Software IEC/IEEE floating-point exception flags.
97-------------------------------------------------------------------------------
98*/
99extern fp_except float_exception_flags;
100extern fp_except float_exception_mask;
101enum {
102    float_flag_inexact   = FP_X_IMP,
103    float_flag_underflow = FP_X_UFL,
104    float_flag_overflow  = FP_X_OFL,
105    float_flag_divbyzero = FP_X_DZ,
106    float_flag_invalid   = FP_X_INV
107};
108
109/*
110-------------------------------------------------------------------------------
111Routine to raise any or all of the software IEC/IEEE floating-point
112exception flags.
113-------------------------------------------------------------------------------
114*/
115void float_raise( fp_except );
116
117/*
118-------------------------------------------------------------------------------
119Software IEC/IEEE integer-to-floating-point conversion routines.
120-------------------------------------------------------------------------------
121*/
122float32 int32_to_float32( int32 );
123float32 uint32_to_float32( uint32 );
124float64 int32_to_float64( int32 );
125float64 uint32_to_float64( uint32 );
126#ifdef FLOATX80
127floatx80 int32_to_floatx80( int32 );
128floatx80 uint32_to_floatx80( uint32 );
129#endif
130#ifdef FLOAT128
131float128 int32_to_float128( int32 );
132float128 uint32_to_float128( uint32 );
133#endif
134#ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */
135float32 int64_to_float32( long long );
136float64 int64_to_float64( long long );
137#ifdef FLOATX80
138floatx80 int64_to_floatx80( long long );
139#endif
140#endif
141#ifdef FLOAT128
142float128 int64_to_float128( long long );
143#endif
144
145/*
146-------------------------------------------------------------------------------
147Software IEC/IEEE single-precision conversion routines.
148-------------------------------------------------------------------------------
149*/
150int float32_to_int32( float32 );
151int float32_to_int32_round_to_zero( float32 );
152#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
153unsigned int float32_to_uint32_round_to_zero( float32 );
154#endif
155#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
156long long float32_to_int64( float32 );
157long long float32_to_int64_round_to_zero( float32 );
158#endif
159float64 float32_to_float64( float32 );
160#ifdef FLOATX80
161floatx80 float32_to_floatx80( float32 );
162#endif
163#ifdef FLOAT128
164float128 float32_to_float128( float32 );
165#endif
166
167/*
168-------------------------------------------------------------------------------
169Software IEC/IEEE single-precision operations.
170-------------------------------------------------------------------------------
171*/
172float32 float32_round_to_int( float32 );
173float32 float32_add( float32, float32 );
174float32 float32_sub( float32, float32 );
175float32 float32_mul( float32, float32 );
176float32 float32_div( float32, float32 );
177float32 float32_rem( float32, float32 );
178float32 float32_sqrt( float32 );
179int float32_eq( float32, float32 );
180int float32_le( float32, float32 );
181int float32_lt( float32, float32 );
182int float32_eq_signaling( float32, float32 );
183int float32_le_quiet( float32, float32 );
184int float32_lt_quiet( float32, float32 );
185#ifndef SOFTFLOAT_FOR_GCC
186int float32_is_signaling_nan( float32 );
187#endif
188
189/*
190-------------------------------------------------------------------------------
191Software IEC/IEEE double-precision conversion routines.
192-------------------------------------------------------------------------------
193*/
194int float64_to_int32( float64 );
195int float64_to_int32_round_to_zero( float64 );
196#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
197unsigned int float64_to_uint32_round_to_zero( float64 );
198#endif
199#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
200long long float64_to_int64( float64 );
201long long float64_to_int64_round_to_zero( float64 );
202#endif
203float32 float64_to_float32( float64 );
204#ifdef FLOATX80
205floatx80 float64_to_floatx80( float64 );
206#endif
207#ifdef FLOAT128
208float128 float64_to_float128( float64 );
209#endif
210
211/*
212-------------------------------------------------------------------------------
213Software IEC/IEEE double-precision operations.
214-------------------------------------------------------------------------------
215*/
216float64 float64_round_to_int( float64 );
217float64 float64_add( float64, float64 );
218float64 float64_sub( float64, float64 );
219float64 float64_mul( float64, float64 );
220float64 float64_div( float64, float64 );
221float64 float64_rem( float64, float64 );
222float64 float64_sqrt( float64 );
223int float64_eq( float64, float64 );
224int float64_le( float64, float64 );
225int float64_lt( float64, float64 );
226int float64_eq_signaling( float64, float64 );
227int float64_le_quiet( float64, float64 );
228int float64_lt_quiet( float64, float64 );
229#ifndef SOFTFLOAT_FOR_GCC
230int float64_is_signaling_nan( float64 );
231#endif
232
233#ifdef FLOATX80
234
235/*
236-------------------------------------------------------------------------------
237Software IEC/IEEE extended double-precision conversion routines.
238-------------------------------------------------------------------------------
239*/
240int floatx80_to_int32( floatx80 );
241int floatx80_to_int32_round_to_zero( floatx80 );
242long long floatx80_to_int64( floatx80 );
243long long floatx80_to_int64_round_to_zero( floatx80 );
244float32 floatx80_to_float32( floatx80 );
245float64 floatx80_to_float64( floatx80 );
246#ifdef FLOAT128
247float128 floatx80_to_float128( floatx80 );
248#endif
249
250/*
251-------------------------------------------------------------------------------
252Software IEC/IEEE extended double-precision rounding precision.  Valid
253values are 32, 64, and 80.
254-------------------------------------------------------------------------------
255*/
256extern int floatx80_rounding_precision;
257
258/*
259-------------------------------------------------------------------------------
260Software IEC/IEEE extended double-precision operations.
261-------------------------------------------------------------------------------
262*/
263floatx80 floatx80_round_to_int( floatx80 );
264floatx80 floatx80_add( floatx80, floatx80 );
265floatx80 floatx80_sub( floatx80, floatx80 );
266floatx80 floatx80_mul( floatx80, floatx80 );
267floatx80 floatx80_div( floatx80, floatx80 );
268floatx80 floatx80_rem( floatx80, floatx80 );
269floatx80 floatx80_sqrt( floatx80 );
270int floatx80_eq( floatx80, floatx80 );
271int floatx80_le( floatx80, floatx80 );
272int floatx80_lt( floatx80, floatx80 );
273int floatx80_eq_signaling( floatx80, floatx80 );
274int floatx80_le_quiet( floatx80, floatx80 );
275int floatx80_lt_quiet( floatx80, floatx80 );
276int floatx80_is_signaling_nan( floatx80 );
277
278#endif
279
280#ifdef FLOAT128
281
282/*
283-------------------------------------------------------------------------------
284Software IEC/IEEE quadruple-precision conversion routines.
285-------------------------------------------------------------------------------
286*/
287int float128_to_int32( float128 );
288int float128_to_int32_round_to_zero( float128 );
289#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
290unsigned int float128_to_uint32_round_to_zero( float64 );
291#endif
292long long float128_to_int64( float128 );
293long long float128_to_int64_round_to_zero( float128 );
294#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
295unsigned long long float128_to_uint64_round_to_zero( float128 );
296#endif
297float32 float128_to_float32( float128 );
298float64 float128_to_float64( float128 );
299#ifdef FLOATX80
300floatx80 float128_to_floatx80( float128 );
301#endif
302
303/*
304-------------------------------------------------------------------------------
305Software IEC/IEEE quadruple-precision operations.
306-------------------------------------------------------------------------------
307*/
308float128 float128_round_to_int( float128 );
309float128 float128_add( float128, float128 );
310float128 float128_sub( float128, float128 );
311float128 float128_mul( float128, float128 );
312float128 float128_div( float128, float128 );
313float128 float128_rem( float128, float128 );
314float128 float128_sqrt( float128 );
315int float128_eq( float128, float128 );
316int float128_le( float128, float128 );
317int float128_lt( float128, float128 );
318int float128_eq_signaling( float128, float128 );
319int float128_le_quiet( float128, float128 );
320int float128_lt_quiet( float128, float128 );
321int float128_is_signaling_nan( float128 );
322flag float128_is_nan( float128 );
323
324#endif
325
326