xref: /openbmc/linux/arch/mips/math-emu/ieee754sp.h (revision e23feb16)
1 /*
2  * IEEE754 floating point
3  * double precision internal header file
4  */
5 /*
6  * MIPS floating point support
7  * Copyright (C) 1994-2000 Algorithmics Ltd.
8  *
9  * ########################################################################
10  *
11  *  This program is free software; you can distribute it and/or modify it
12  *  under the terms of the GNU General Public License (Version 2) as
13  *  published by the Free Software Foundation.
14  *
15  *  This program is distributed in the hope it will be useful, but WITHOUT
16  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
18  *  for more details.
19  *
20  *  You should have received a copy of the GNU General Public License along
21  *  with this program; if not, write to the Free Software Foundation, Inc.,
22  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
23  *
24  * ########################################################################
25  */
26 
27 
28 #include "ieee754int.h"
29 
30 #define assert(expr) ((void)0)
31 
32 /* 3bit extended single precision sticky right shift */
33 #define SPXSRSXn(rs) \
34   (xe += rs, \
35    xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0))
36 
37 #define SPXSRSX1() \
38   (xe++, (xm = (xm >> 1) | (xm & 1)))
39 
40 #define SPXSRSYn(rs) \
41    (ye+=rs, \
42     ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0))
43 
44 #define SPXSRSY1() \
45    (ye++, (ym = (ym >> 1) | (ym & 1)))
46 
47 /* convert denormal to normalized with extended exponent */
48 #define SPDNORMx(m,e) \
49   while( (m >> SP_MBITS) == 0) { m <<= 1; e--; }
50 #define SPDNORMX	SPDNORMx(xm, xe)
51 #define SPDNORMY	SPDNORMx(ym, ye)
52 
53 static inline ieee754sp buildsp(int s, int bx, unsigned m)
54 {
55 	ieee754sp r;
56 
57 	assert((s) == 0 || (s) == 1);
58 	assert((bx) >= SP_EMIN - 1 + SP_EBIAS
59 	       && (bx) <= SP_EMAX + 1 + SP_EBIAS);
60 	assert(((m) >> SP_MBITS) == 0);
61 
62 	r.parts.sign = s;
63 	r.parts.bexp = bx;
64 	r.parts.mant = m;
65 
66 	return r;
67 }
68 
69 extern int ieee754sp_isnan(ieee754sp);
70 extern int ieee754sp_issnan(ieee754sp);
71 extern int ieee754si_xcpt(int, const char *, ...);
72 extern s64 ieee754di_xcpt(s64, const char *, ...);
73 extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...);
74 extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...);
75 extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp);
76 extern ieee754sp ieee754sp_format(int, int, unsigned);
77 
78 
79 #define SPNORMRET2(s, e, m, name, a0, a1) \
80 { \
81     ieee754sp V = ieee754sp_format(s, e, m); \
82     if(TSTX()) \
83       return ieee754sp_xcpt(V, name, a0, a1); \
84     else \
85       return V; \
86 }
87 
88 #define SPNORMRET1(s, e, m, name, a0)  SPNORMRET2(s, e, m, name, a0, a0)
89