Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* IEEE754 floating point arithmetic |
| 2 | * double precision: common utilities |
| 3 | */ |
| 4 | /* |
| 5 | * MIPS floating point support |
| 6 | * Copyright (C) 1994-2000 Algorithmics Ltd. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * This program is free software; you can distribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License (Version 2) as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 15 | * for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
Ralf Baechle | 3f7cac4 | 2014-04-26 01:49:14 +0200 | [diff] [blame] | 19 | * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | */ |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include "ieee754dp.h" |
| 23 | |
Ralf Baechle | 2209bcb | 2014-04-16 01:31:11 +0200 | [diff] [blame] | 24 | int ieee754dp_cmp(union ieee754dp x, union ieee754dp y, int cmp, int sig) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | { |
Ralf Baechle | 3f7cac4 | 2014-04-26 01:49:14 +0200 | [diff] [blame] | 26 | s64 vx; |
| 27 | s64 vy; |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | COMPXDP; |
| 30 | COMPYDP; |
| 31 | |
| 32 | EXPLODEXDP; |
| 33 | EXPLODEYDP; |
| 34 | FLUSHXDP; |
| 35 | FLUSHYDP; |
Ralf Baechle | 9e8bad1 | 2014-04-19 00:36:32 +0200 | [diff] [blame] | 36 | ieee754_clearcx(); /* Even clear inexact flag here */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | if (ieee754dp_isnan(x) || ieee754dp_isnan(y)) { |
| 39 | if (sig || xc == IEEE754_CLASS_SNAN || yc == IEEE754_CLASS_SNAN) |
Ralf Baechle | 9e8bad1 | 2014-04-19 00:36:32 +0200 | [diff] [blame] | 40 | ieee754_setcx(IEEE754_INVALID_OPERATION); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | if (cmp & IEEE754_CUN) |
| 42 | return 1; |
| 43 | if (cmp & (IEEE754_CLT | IEEE754_CGT)) { |
Ralf Baechle | 9e8bad1 | 2014-04-19 00:36:32 +0200 | [diff] [blame] | 44 | if (sig && ieee754_setandtestcx(IEEE754_INVALID_OPERATION)) |
Ralf Baechle | 90efba3 | 2014-04-25 03:19:57 +0200 | [diff] [blame] | 45 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | } |
| 47 | return 0; |
| 48 | } else { |
Ralf Baechle | 3f7cac4 | 2014-04-26 01:49:14 +0200 | [diff] [blame] | 49 | vx = x.bits; |
| 50 | vy = y.bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | if (vx < 0) |
| 53 | vx = -vx ^ DP_SIGN_BIT; |
| 54 | if (vy < 0) |
| 55 | vy = -vy ^ DP_SIGN_BIT; |
| 56 | |
| 57 | if (vx < vy) |
| 58 | return (cmp & IEEE754_CLT) != 0; |
| 59 | else if (vx == vy) |
| 60 | return (cmp & IEEE754_CEQ) != 0; |
| 61 | else |
| 62 | return (cmp & IEEE754_CGT) != 0; |
| 63 | } |
| 64 | } |