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 #include <linux/compiler.h> 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 union ieee754sp buildsp(int s, int bx, unsigned m) 55 { 56 union 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(union ieee754sp); 71 extern int ieee754sp_issnan(union ieee754sp); 72 extern int __cold ieee754si_xcpt(int, const char *, ...); 73 extern s64 __cold ieee754di_xcpt(s64, const char *, ...); 74 extern union ieee754sp __cold ieee754sp_xcpt(union ieee754sp, const char *, ...); 75 extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp, const char *, ...); 76 extern union ieee754sp ieee754sp_bestnan(union ieee754sp, union ieee754sp); 77 extern union ieee754sp ieee754sp_format(int, int, unsigned); 78 79 80 #define SPNORMRET2(s, e, m, name, a0, a1) \ 81 { \ 82 union ieee754sp V = ieee754sp_format(s, e, m); \ 83 \ 84 if (TSTX()) \ 85 return ieee754sp_xcpt(V, name, a0, a1); \ 86 else \ 87 return V; \ 88 } 89 90 #define SPNORMRET1(s, e, m, name, a0) SPNORMRET2(s, e, m, name, a0, a0) 91