Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 58 | #define CLPAIR(x, y) ((x)*6+(y)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #define CLEARCX \ |
| 61 | (ieee754_csr.cx = 0) |
| 62 | |
| 63 | #define SETCX(x) \ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 64 | (ieee754_csr.cx |= (x), ieee754_csr.sx |= (x)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
| 66 | #define SETANDTESTCX(x) \ |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 67 | (SETCX(x), ieee754_csr.mx & (x)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 79 | #define EXPLODESP(v, vc, vs, ve, vm) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 103 | #define EXPLODEXSP EXPLODESP(x, xc, xs, xe, xm) |
| 104 | #define EXPLODEYSP EXPLODESP(y, yc, ys, ye, ym) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 113 | #define EXPLODEDP(v, vc, vs, ve, vm) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | } |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 137 | #define EXPLODEXDP EXPLODEDP(x, xc, xs, xe, xm) |
| 138 | #define EXPLODEYDP EXPLODEDP(y, yc, ys, ye, ym) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 140 | #define FLUSHDP(v, vc, vs, ve, vm) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 151 | #define FLUSHSP(v, vc, vs, ve, vm) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ralf Baechle | 21a151d | 2007-10-11 23:46:15 +0100 | [diff] [blame] | 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) |