1/*	$NetBSD: softfloat.h,v 1.6 2002/05/12 13:12:46 bjh21 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/* #define FLOAT128 */
46
47#include <fenv.h>
48
49/*
50-------------------------------------------------------------------------------
51Software IEC/IEEE floating-point types.
52-------------------------------------------------------------------------------
53*/
54typedef unsigned int float32;
55typedef unsigned long long float64;
56#ifdef FLOATX80
57typedef struct {
58    unsigned short high;
59    unsigned long long low;
60} floatx80;
61#endif
62#ifdef FLOAT128
63typedef struct {
64    unsigned long long high, low;
65} float128;
66#endif
67
68/*
69-------------------------------------------------------------------------------
70Software IEC/IEEE floating-point underflow tininess-detection mode.
71-------------------------------------------------------------------------------
72*/
73#ifndef SOFTFLOAT_FOR_GCC
74extern int float_detect_tininess;
75#endif
76enum {
77    float_tininess_after_rounding  = 0,
78    float_tininess_before_rounding = 1
79};
80
81/*
82-------------------------------------------------------------------------------
83Software IEC/IEEE floating-point rounding mode.
84-------------------------------------------------------------------------------
85*/
86extern int float_rounding_mode;
87enum {
88    float_round_nearest_even = FE_TONEAREST,
89    float_round_to_zero      = FE_TOWARDZERO,
90    float_round_down         = FE_DOWNWARD,
91    float_round_up           = FE_UPWARD
92};
93
94/*
95-------------------------------------------------------------------------------
96Software IEC/IEEE floating-point exception flags.
97-------------------------------------------------------------------------------
98*/
99extern int float_exception_flags;
100extern int float_exception_mask;
101enum {
102    float_flag_inexact   = FE_INEXACT,
103    float_flag_underflow = FE_UNDERFLOW,
104    float_flag_overflow  = FE_OVERFLOW,
105    float_flag_divbyzero = FE_DIVBYZERO,
106    float_flag_invalid   = FE_INVALID
107};
108
109/*
110-------------------------------------------------------------------------------
111Routine to raise any or all of the software IEC/IEEE floating-point
112exception flags.
113-------------------------------------------------------------------------------
114*/
115void float_raise( int );
116
117/*
118-------------------------------------------------------------------------------
119Software IEC/IEEE integer-to-floating-point conversion routines.
120-------------------------------------------------------------------------------
121*/
122float32 int32_to_float32( int );
123float64 int32_to_float64( int );
124#ifdef FLOATX80
125floatx80 int32_to_floatx80( int );
126#endif
127#ifdef FLOAT128
128float128 int32_to_float128( int );
129#endif
130#ifndef SOFTFLOAT_FOR_GCC /* __floatdi?f is in libgcc2.c */
131float32 int64_to_float32( long long );
132float64 int64_to_float64( long long );
133#ifdef FLOATX80
134floatx80 int64_to_floatx80( long long );
135#endif
136#ifdef FLOAT128
137float128 int64_to_float128( long long );
138#endif
139#endif
140
141/*
142-------------------------------------------------------------------------------
143Software IEC/IEEE single-precision conversion routines.
144-------------------------------------------------------------------------------
145*/
146int float32_to_int32( float32 );
147int float32_to_int32_round_to_zero( float32 );
148#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
149unsigned int float32_to_uint32_round_to_zero( float32 );
150#endif
151#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
152long long float32_to_int64( float32 );
153long long float32_to_int64_round_to_zero( float32 );
154#endif
155float64 float32_to_float64( float32 );
156#ifdef FLOATX80
157floatx80 float32_to_floatx80( float32 );
158#endif
159#ifdef FLOAT128
160float128 float32_to_float128( float32 );
161#endif
162
163/*
164-------------------------------------------------------------------------------
165Software IEC/IEEE single-precision operations.
166-------------------------------------------------------------------------------
167*/
168float32 float32_round_to_int( float32 );
169float32 float32_add( float32, float32 );
170float32 float32_sub( float32, float32 );
171float32 float32_mul( float32, float32 );
172float32 float32_div( float32, float32 );
173float32 float32_rem( float32, float32 );
174float32 float32_sqrt( float32 );
175int float32_eq( float32, float32 );
176int float32_le( float32, float32 );
177int float32_lt( float32, float32 );
178int float32_eq_signaling( float32, float32 );
179int float32_le_quiet( float32, float32 );
180int float32_lt_quiet( float32, float32 );
181#ifndef SOFTFLOAT_FOR_GCC
182int float32_is_signaling_nan( float32 );
183#endif
184
185/*
186-------------------------------------------------------------------------------
187Software IEC/IEEE double-precision conversion routines.
188-------------------------------------------------------------------------------
189*/
190int float64_to_int32( float64 );
191int float64_to_int32_round_to_zero( float64 );
192#if defined(SOFTFLOAT_FOR_GCC) && defined(SOFTFLOAT_NEED_FIXUNS)
193unsigned int float64_to_uint32_round_to_zero( float64 );
194#endif
195#ifndef SOFTFLOAT_FOR_GCC /* __fix?fdi provided by libgcc2.c */
196long long float64_to_int64( float64 );
197long long float64_to_int64_round_to_zero( float64 );
198#endif
199float32 float64_to_float32( float64 );
200#ifdef FLOATX80
201floatx80 float64_to_floatx80( float64 );
202#endif
203#ifdef FLOAT128
204float128 float64_to_float128( float64 );
205#endif
206
207/*
208-------------------------------------------------------------------------------
209Software IEC/IEEE double-precision operations.
210-------------------------------------------------------------------------------
211*/
212float64 float64_round_to_int( float64 );
213float64 float64_add( float64, float64 );
214float64 float64_sub( float64, float64 );
215float64 float64_mul( float64, float64 );
216float64 float64_div( float64, float64 );
217float64 float64_rem( float64, float64 );
218float64 float64_sqrt( float64 );
219int float64_eq( float64, float64 );
220int float64_le( float64, float64 );
221int float64_lt( float64, float64 );
222int float64_eq_signaling( float64, float64 );
223int float64_le_quiet( float64, float64 );
224int float64_lt_quiet( float64, float64 );
225#ifndef SOFTFLOAT_FOR_GCC
226int float64_is_signaling_nan( float64 );
227#endif
228
229#ifdef FLOATX80
230
231/*
232-------------------------------------------------------------------------------
233Software IEC/IEEE extended double-precision conversion routines.
234-------------------------------------------------------------------------------
235*/
236int floatx80_to_int32( floatx80 );
237int floatx80_to_int32_round_to_zero( floatx80 );
238long long floatx80_to_int64( floatx80 );
239long long floatx80_to_int64_round_to_zero( floatx80 );
240float32 floatx80_to_float32( floatx80 );
241float64 floatx80_to_float64( floatx80 );
242#ifdef FLOAT128
243float128 floatx80_to_float128( floatx80 );
244#endif
245
246/*
247-------------------------------------------------------------------------------
248Software IEC/IEEE extended double-precision rounding precision.  Valid
249values are 32, 64, and 80.
250-------------------------------------------------------------------------------
251*/
252extern int floatx80_rounding_precision;
253
254/*
255-------------------------------------------------------------------------------
256Software IEC/IEEE extended double-precision operations.
257-------------------------------------------------------------------------------
258*/
259floatx80 floatx80_round_to_int( floatx80 );
260floatx80 floatx80_add( floatx80, floatx80 );
261floatx80 floatx80_sub( floatx80, floatx80 );
262floatx80 floatx80_mul( floatx80, floatx80 );
263floatx80 floatx80_div( floatx80, floatx80 );
264floatx80 floatx80_rem( floatx80, floatx80 );
265floatx80 floatx80_sqrt( floatx80 );
266int floatx80_eq( floatx80, floatx80 );
267int floatx80_le( floatx80, floatx80 );
268int floatx80_lt( floatx80, floatx80 );
269int floatx80_eq_signaling( floatx80, floatx80 );
270int floatx80_le_quiet( floatx80, floatx80 );
271int floatx80_lt_quiet( floatx80, floatx80 );
272int floatx80_is_signaling_nan( floatx80 );
273
274#endif
275
276#ifdef FLOAT128
277
278/*
279-------------------------------------------------------------------------------
280Software IEC/IEEE quadruple-precision conversion routines.
281-------------------------------------------------------------------------------
282*/
283int float128_to_int32( float128 );
284int float128_to_int32_round_to_zero( float128 );
285long long float128_to_int64( float128 );
286long long float128_to_int64_round_to_zero( float128 );
287float32 float128_to_float32( float128 );
288float64 float128_to_float64( float128 );
289#ifdef FLOATX80
290floatx80 float128_to_floatx80( float128 );
291#endif
292
293/*
294-------------------------------------------------------------------------------
295Software IEC/IEEE quadruple-precision operations.
296-------------------------------------------------------------------------------
297*/
298float128 float128_round_to_int( float128 );
299float128 float128_add( float128, float128 );
300float128 float128_sub( float128, float128 );
301float128 float128_mul( float128, float128 );
302float128 float128_div( float128, float128 );
303float128 float128_rem( float128, float128 );
304float128 float128_sqrt( float128 );
305int float128_eq( float128, float128 );
306int float128_le( float128, float128 );
307int float128_lt( float128, float128 );
308int float128_eq_signaling( float128, float128 );
309int float128_le_quiet( float128, float128 );
310int float128_lt_quiet( float128, float128 );
311int float128_is_signaling_nan( float128 );
312
313#endif
314
315