1 /* 2 * IEEE754 floating point 3 * common internal header file 4 */ 5 /* 6 * MIPS floating point support 7 * Copyright (C) 1994-2000 Algorithmics Ltd. All rights reserved. 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 "ieee754.h" 30 31 #define DP_EBIAS 1023 32 #define DP_EMIN (-1022) 33 #define DP_EMAX 1023 34 #define DP_MBITS 52 35 36 #define SP_EBIAS 127 37 #define SP_EMIN (-126) 38 #define SP_EMAX 127 39 #define SP_MBITS 23 40 41 #define DP_MBIT(x) ((u64)1 << (x)) 42 #define DP_HIDDEN_BIT DP_MBIT(DP_MBITS) 43 #define DP_SIGN_BIT DP_MBIT(63) 44 45 #define SP_MBIT(x) ((u32)1 << (x)) 46 #define SP_HIDDEN_BIT SP_MBIT(SP_MBITS) 47 #define SP_SIGN_BIT SP_MBIT(31) 48 49 50 #define SPSIGN(sp) (sp.parts.sign) 51 #define SPBEXP(sp) (sp.parts.bexp) 52 #define SPMANT(sp) (sp.parts.mant) 53 54 #define DPSIGN(dp) (dp.parts.sign) 55 #define DPBEXP(dp) (dp.parts.bexp) 56 #define DPMANT(dp) (dp.parts.mant) 57 58 #define CLPAIR(x,y) ((x)*6+(y)) 59 60 #define CLEARCX \ 61 (ieee754_csr.cx = 0) 62 63 #define SETCX(x) \ 64 (ieee754_csr.cx |= (x),ieee754_csr.sx |= (x)) 65 66 #define SETANDTESTCX(x) \ 67 (SETCX(x),ieee754_csr.mx & (x)) 68 69 #define TSTX() \ 70 (ieee754_csr.cx & ieee754_csr.mx) 71 72 73 #define COMPXSP \ 74 unsigned xm; int xe; int xs; int xc 75 76 #define COMPYSP \ 77 unsigned ym; int ye; int ys; int yc 78 79 #define EXPLODESP(v,vc,vs,ve,vm) \ 80 {\ 81 vs = SPSIGN(v);\ 82 ve = SPBEXP(v);\ 83 vm = SPMANT(v);\ 84 if(ve == SP_EMAX+1+SP_EBIAS){\ 85 if(vm == 0)\ 86 vc = IEEE754_CLASS_INF;\ 87 else if(vm & SP_MBIT(SP_MBITS-1)) \ 88 vc = IEEE754_CLASS_SNAN;\ 89 else \ 90 vc = IEEE754_CLASS_QNAN;\ 91 } else if(ve == SP_EMIN-1+SP_EBIAS) {\ 92 if(vm) {\ 93 ve = SP_EMIN;\ 94 vc = IEEE754_CLASS_DNORM;\ 95 } else\ 96 vc = IEEE754_CLASS_ZERO;\ 97 } else {\ 98 ve -= SP_EBIAS;\ 99 vm |= SP_HIDDEN_BIT;\ 100 vc = IEEE754_CLASS_NORM;\ 101 }\ 102 } 103 #define EXPLODEXSP EXPLODESP(x,xc,xs,xe,xm) 104 #define EXPLODEYSP EXPLODESP(y,yc,ys,ye,ym) 105 106 107 #define COMPXDP \ 108 u64 xm; int xe; int xs; int xc 109 110 #define COMPYDP \ 111 u64 ym; int ye; int ys; int yc 112 113 #define EXPLODEDP(v,vc,vs,ve,vm) \ 114 {\ 115 vm = DPMANT(v);\ 116 vs = DPSIGN(v);\ 117 ve = DPBEXP(v);\ 118 if(ve == DP_EMAX+1+DP_EBIAS){\ 119 if(vm == 0)\ 120 vc = IEEE754_CLASS_INF;\ 121 else if(vm & DP_MBIT(DP_MBITS-1)) \ 122 vc = IEEE754_CLASS_SNAN;\ 123 else \ 124 vc = IEEE754_CLASS_QNAN;\ 125 } else if(ve == DP_EMIN-1+DP_EBIAS) {\ 126 if(vm) {\ 127 ve = DP_EMIN;\ 128 vc = IEEE754_CLASS_DNORM;\ 129 } else\ 130 vc = IEEE754_CLASS_ZERO;\ 131 } else {\ 132 ve -= DP_EBIAS;\ 133 vm |= DP_HIDDEN_BIT;\ 134 vc = IEEE754_CLASS_NORM;\ 135 }\ 136 } 137 #define EXPLODEXDP EXPLODEDP(x,xc,xs,xe,xm) 138 #define EXPLODEYDP EXPLODEDP(y,yc,ys,ye,ym) 139 140 #define FLUSHDP(v,vc,vs,ve,vm) \ 141 if(vc==IEEE754_CLASS_DNORM) {\ 142 if(ieee754_csr.nod) {\ 143 SETCX(IEEE754_INEXACT);\ 144 vc = IEEE754_CLASS_ZERO;\ 145 ve = DP_EMIN-1+DP_EBIAS;\ 146 vm = 0;\ 147 v = ieee754dp_zero(vs);\ 148 }\ 149 } 150 151 #define FLUSHSP(v,vc,vs,ve,vm) \ 152 if(vc==IEEE754_CLASS_DNORM) {\ 153 if(ieee754_csr.nod) {\ 154 SETCX(IEEE754_INEXACT);\ 155 vc = IEEE754_CLASS_ZERO;\ 156 ve = SP_EMIN-1+SP_EBIAS;\ 157 vm = 0;\ 158 v = ieee754sp_zero(vs);\ 159 }\ 160 } 161 162 #define FLUSHXDP FLUSHDP(x,xc,xs,xe,xm) 163 #define FLUSHYDP FLUSHDP(y,yc,ys,ye,ym) 164 #define FLUSHXSP FLUSHSP(x,xc,xs,xe,xm) 165 #define FLUSHYSP FLUSHSP(y,yc,ys,ye,ym) 166