| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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) |