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1da177e4 LT |
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 | * http://www.algor.co.uk | |
9 | * | |
10 | * ######################################################################## | |
11 | * | |
12 | * This program is free software; you can distribute it and/or modify it | |
13 | * under the terms of the GNU General Public License (Version 2) as | |
14 | * published by the Free Software Foundation. | |
15 | * | |
16 | * This program is distributed in the hope it will be useful, but WITHOUT | |
17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | * for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
22 | * with this program; if not, write to the Free Software Foundation, Inc., | |
23 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
24 | * | |
25 | * ######################################################################## | |
26 | */ | |
27 | ||
28 | ||
29 | #include "ieee754int.h" | |
30 | ||
31 | #define assert(expr) ((void)0) | |
32 | ||
33 | /* 3bit extended single precision sticky right shift */ | |
34 | #define SPXSRSXn(rs) \ | |
35 | (xe += rs, \ | |
36 | xm = (rs > (SP_MBITS+3))?1:((xm) >> (rs)) | ((xm) << (32-(rs)) != 0)) | |
37 | ||
38 | #define SPXSRSX1() \ | |
39 | (xe++, (xm = (xm >> 1) | (xm & 1))) | |
40 | ||
41 | #define SPXSRSYn(rs) \ | |
42 | (ye+=rs, \ | |
43 | ym = (rs > (SP_MBITS+3))?1:((ym) >> (rs)) | ((ym) << (32-(rs)) != 0)) | |
44 | ||
45 | #define SPXSRSY1() \ | |
46 | (ye++, (ym = (ym >> 1) | (ym & 1))) | |
47 | ||
48 | /* convert denormal to normalized with extended exponent */ | |
49 | #define SPDNORMx(m,e) \ | |
50 | while( (m >> SP_MBITS) == 0) { m <<= 1; e--; } | |
51 | #define SPDNORMX SPDNORMx(xm,xe) | |
52 | #define SPDNORMY SPDNORMx(ym,ye) | |
53 | ||
54 | static __inline ieee754sp buildsp(int s, int bx, unsigned m) | |
55 | { | |
56 | ieee754sp r; | |
57 | ||
58 | assert((s) == 0 || (s) == 1); | |
59 | assert((bx) >= SP_EMIN - 1 + SP_EBIAS | |
60 | && (bx) <= SP_EMAX + 1 + SP_EBIAS); | |
61 | assert(((m) >> SP_MBITS) == 0); | |
62 | ||
63 | r.parts.sign = s; | |
64 | r.parts.bexp = bx; | |
65 | r.parts.mant = m; | |
66 | ||
67 | return r; | |
68 | } | |
69 | ||
70 | extern int ieee754sp_isnan(ieee754sp); | |
71 | extern int ieee754sp_issnan(ieee754sp); | |
72 | extern int ieee754si_xcpt(int, const char *, ...); | |
73 | extern s64 ieee754di_xcpt(s64, const char *, ...); | |
74 | extern ieee754sp ieee754sp_xcpt(ieee754sp, const char *, ...); | |
75 | extern ieee754sp ieee754sp_nanxcpt(ieee754sp, const char *, ...); | |
76 | extern ieee754sp ieee754sp_bestnan(ieee754sp, ieee754sp); | |
77 | extern ieee754sp ieee754sp_format(int, int, unsigned); | |
78 | ||
79 | ||
80 | #define SPNORMRET2(s,e,m,name,a0,a1) \ | |
81 | { \ | |
82 | ieee754sp V = ieee754sp_format(s,e,m); \ | |
83 | if(TSTX()) \ | |
84 | return ieee754sp_xcpt(V,name,a0,a1); \ | |
85 | else \ | |
86 | return V; \ | |
87 | } | |
88 | ||
89 | #define SPNORMRET1(s,e,m,name,a0) SPNORMRET2(s,e,m,name,a0,a0) |