| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | /* 32bit * 32bit => 64bit unsigned integer multiplication */ |
| 59 | #define DPXMULT(x, y) ((u64)(x) * (u64)y) |
| 60 | |
| 61 | /* convert denormal to normalized with extended exponent */ |
| 62 | #define DPDNORMx(m,e) \ |
| 63 | while ((m >> DP_FBITS) == 0) { m <<= 1; e--; } |
| 64 | #define DPDNORMX DPDNORMx(xm, xe) |
| 65 | #define DPDNORMY DPDNORMx(ym, ye) |
| 66 | #define DPDNORMZ DPDNORMx(zm, ze) |
| 67 | |
| 68 | static inline union ieee754dp builddp(int s, int bx, u64 m) |
| 69 | { |
| 70 | union ieee754dp r; |
| 71 | |
| 72 | assert((s) == 0 || (s) == 1); |
| 73 | assert((bx) >= DP_EMIN - 1 + DP_EBIAS |
| 74 | && (bx) <= DP_EMAX + 1 + DP_EBIAS); |
| 75 | assert(((m) >> DP_FBITS) == 0); |
| 76 | |
| 77 | r.sign = s; |
| 78 | r.bexp = bx; |
| 79 | r.mant = m; |
| 80 | |
| 81 | return r; |
| 82 | } |
| 83 | |
| 84 | extern union ieee754dp __cold ieee754dp_nanxcpt(union ieee754dp); |
| 85 | extern union ieee754dp ieee754dp_format(int, int, u64); |