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 SP_EBIAS 127 30 #define SP_EMIN (-126) 31 #define SP_EMAX 127 32 #define SP_FBITS 23 33 #define SP_MBITS 23 34 35 #define SP_MBIT(x) ((u32)1 << (x)) 36 #define SP_HIDDEN_BIT SP_MBIT(SP_FBITS) 37 #define SP_SIGN_BIT SP_MBIT(31) 38 39 #define SPSIGN(sp) (sp.sign) 40 #define SPBEXP(sp) (sp.bexp) 41 #define SPMANT(sp) (sp.mant) 42 43 static inline int ieee754sp_finite(union ieee754sp x) 44 { 45 return SPBEXP(x) != SP_EMAX + 1 + SP_EBIAS; 46 } 47 48 /* 64 bit right shift with rounding */ 49 #define XSPSRS64(v, rs) \ 50 (((rs) >= 64) ? ((v) != 0) : ((v) >> (rs)) | ((v) << (64-(rs)) != 0)) 51 52 /* 3bit extended single precision sticky right shift */ 53 #define XSPSRS(v, rs) \ 54 ((rs > (SP_FBITS+3))?1:((v) >> (rs)) | ((v) << (32-(rs)) != 0)) 55 56 #define XSPSRS1(m) \ 57 ((m >> 1) | (m & 1)) 58 59 #define SPXSRSX1() \ 60 (xe++, (xm = XSPSRS1(xm))) 61 62 #define SPXSRSY1() \ 63 (ye++, (ym = XSPSRS1(ym))) 64 65 /* convert denormal to normalized with extended exponent */ 66 #define SPDNORMx(m,e) \ 67 while ((m >> SP_FBITS) == 0) { m <<= 1; e--; } 68 #define SPDNORMX SPDNORMx(xm, xe) 69 #define SPDNORMY SPDNORMx(ym, ye) 70 #define SPDNORMZ SPDNORMx(zm, ze) 71 72 static inline union ieee754sp buildsp(int s, int bx, unsigned int m) 73 { 74 union ieee754sp r; 75 76 assert((s) == 0 || (s) == 1); 77 assert((bx) >= SP_EMIN - 1 + SP_EBIAS 78 && (bx) <= SP_EMAX + 1 + SP_EBIAS); 79 assert(((m) >> SP_FBITS) == 0); 80 81 r.sign = s; 82 r.bexp = bx; 83 r.mant = m; 84 85 return r; 86 } 87 88 extern union ieee754sp __cold ieee754sp_nanxcpt(union ieee754sp); 89 extern union ieee754sp ieee754sp_format(int, int, unsigned); 90