projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * IEEE754 floating point | |
| 3 | * common 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 "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) |