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 * This program is free software; you can distribute it and/or modify it 10 * under the terms of the GNU General Public License (Version 2) as 11 * published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope it will be useful, but WITHOUT 14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 * for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 21 */ 22 23 #include <linux/compiler.h> 24 25 #include "ieee754int.h" 26 27 #define assert(expr) ((void)0) 28 29 #define DP_EBIAS 1023 30 #define DP_EMIN (-1022) 31 #define DP_EMAX 1023 32 #define DP_FBITS 52 33 #define DP_MBITS 52 34 35 #define DP_MBIT(x) ((u64)1 << (x)) 36 #define DP_HIDDEN_BIT DP_MBIT(DP_FBITS) 37 #define DP_SIGN_BIT DP_MBIT(63) 38 39 #define DPSIGN(dp) (dp.sign) 40 #define DPBEXP(dp) (dp.bexp) 41 #define DPMANT(dp) (dp.mant) 42 43 static inline int ieee754dp_finite(union ieee754dp x) 44 { 45 return DPBEXP(x) != DP_EMAX + 1 + DP_EBIAS; 46 } 47 48 /* 3bit extended double precision sticky right shift */ 49 #define XDPSRS(v,rs) \ 50 ((rs > (DP_FBITS+3))?1:((v) >> (rs)) | ((v) << (64-(rs)) != 0)) 51 52 #define XDPSRSX1() \ 53 (xe++, (xm = (xm >> 1) | (xm & 1))) 54 55 #define XDPSRS1(v) \ 56 (((v) >> 1) | ((v) & 1)) 57 58 /* convert denormal to normalized with extended exponent */ 59 #define DPDNORMx(m,e) \ 60 while ((m >> DP_FBITS) == 0) { m <<= 1; e--; } 61 #define DPDNORMX DPDNORMx(xm, xe) 62 #define DPDNORMY DPDNORMx(ym, ye) 63 64 static inline union ieee754dp builddp(int s, int bx, u64 m) 65 { 66 union ieee754dp r; 67 68 assert((s) == 0 || (s) == 1); 69 assert((bx) >= DP_EMIN - 1 + DP_EBIAS 70 && (bx) <= DP_EMAX + 1 + DP_EBIAS); 71 assert(((m) >> DP_FBITS) == 0); 72 73 r.sign = s; 74 r.bexp = bx; 75 r.mant = m; 76 77 return r; 78 } 79 80 extern int ieee754dp_isnan(union ieee754dp); 81 extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp); 82 extern union ieee754dp ieee754dp_format(int, int, u64); 83