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 | |
Ralf Baechle | b3a7ad2 | 2014-04-22 16:33:07 +0200 | [diff] [blame] | 22 | #include "ieee754sp.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "ieee754dp.h" |
| 24 | |
Maciej W. Rozycki | d19cf86 | 2015-04-03 23:25:23 +0100 | [diff] [blame] | 25 | static inline union ieee754dp ieee754dp_nan_fsp(int xs, u64 xm) |
| 26 | { |
| 27 | return builddp(xs, DP_EMAX + 1 + DP_EBIAS, |
| 28 | xm << (DP_FBITS - SP_FBITS)); |
| 29 | } |
| 30 | |
Ralf Baechle | 2209bcb | 2014-04-16 01:31:11 +0200 | [diff] [blame] | 31 | union ieee754dp ieee754dp_fsp(union ieee754sp x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | { |
| 33 | COMPXSP; |
| 34 | |
| 35 | EXPLODEXSP; |
| 36 | |
Ralf Baechle | 9e8bad1 | 2014-04-19 00:36:32 +0200 | [diff] [blame] | 37 | ieee754_clearcx(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | FLUSHXSP; |
| 40 | |
| 41 | switch (xc) { |
| 42 | case IEEE754_CLASS_SNAN: |
Maciej W. Rozycki | d5afa7e | 2015-04-03 23:25:34 +0100 | [diff] [blame] | 43 | return ieee754dp_nanxcpt(ieee754dp_nan_fsp(xs, xm)); |
Ralf Baechle | 3f7cac4 | 2014-04-26 01:49:14 +0200 | [diff] [blame] | 44 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | case IEEE754_CLASS_QNAN: |
Maciej W. Rozycki | 539bfb5 | 2015-04-03 23:25:30 +0100 | [diff] [blame] | 46 | return ieee754dp_nan_fsp(xs, xm); |
Maciej W. Rozycki | d19cf86 | 2015-04-03 23:25:23 +0100 | [diff] [blame] | 47 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | case IEEE754_CLASS_INF: |
| 49 | return ieee754dp_inf(xs); |
Ralf Baechle | 3f7cac4 | 2014-04-26 01:49:14 +0200 | [diff] [blame] | 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | case IEEE754_CLASS_ZERO: |
| 52 | return ieee754dp_zero(xs); |
Ralf Baechle | 3f7cac4 | 2014-04-26 01:49:14 +0200 | [diff] [blame] | 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | case IEEE754_CLASS_DNORM: |
| 55 | /* normalize */ |
Ralf Baechle | ad8fb553 | 2014-04-22 15:51:55 +0200 | [diff] [blame] | 56 | while ((xm >> SP_FBITS) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | xm <<= 1; |
| 58 | xe--; |
| 59 | } |
| 60 | break; |
Ralf Baechle | 3f7cac4 | 2014-04-26 01:49:14 +0200 | [diff] [blame] | 61 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | case IEEE754_CLASS_NORM: |
| 63 | break; |
| 64 | } |
| 65 | |
Ralf Baechle | 3f7cac4 | 2014-04-26 01:49:14 +0200 | [diff] [blame] | 66 | /* |
| 67 | * Can't possibly overflow,underflow, or need rounding |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | */ |
| 69 | |
| 70 | /* drop the hidden bit */ |
| 71 | xm &= ~SP_HIDDEN_BIT; |
| 72 | |
| 73 | return builddp(xs, xe + DP_EBIAS, |
Ralf Baechle | ad8fb553 | 2014-04-22 15:51:55 +0200 | [diff] [blame] | 74 | (u64) xm << (DP_FBITS - SP_FBITS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |