projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04067002 | 1 | /* lround function. POWER6x, PowerPC32 version. |
| bfff8b1b | 2 | Copyright (C) 2006-2017 Free Software Foundation, Inc. |
| 04067002 UD |
3 | This file is part of the GNU C Library. |
| 4 | ||
| 5 | The GNU C Library is free software; you can redistribute it and/or | |
| 6 | modify it under the terms of the GNU Lesser General Public | |
| 7 | License as published by the Free Software Foundation; either | |
| 8 | version 2.1 of the License, or (at your option) any later version. | |
| 9 | ||
| 10 | The GNU C Library is distributed in the hope that it will be useful, | |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 | Lesser General Public License for more details. | |
| 14 | ||
| 15 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 04067002 UD |
18 | |
| 19 | #include <sysdep.h> | |
| 20 | #include <math_ldbl_opt.h> | |
| 9c84384c | 21 | |
| 04067002 | 22 | /* long [r3] lround (float x [fp1]) |
| 9c84384c | 23 | IEEE 1003.1 lround function. IEEE specifies "round to the nearest |
| 04067002 UD |
24 | integer value, rounding halfway cases away from zero, regardless of |
| 25 | the current rounding mode." However PowerPC Architecture defines | |
| 9c84384c JM |
26 | "round to Nearest" as "Choose the best approximation. In case of a |
| 27 | tie, choose the one that is even (least significant bit o).". | |
| 04067002 UD |
28 | So we pre-round using the V2.02 Floating Round to Integer Nearest |
| 29 | instruction before we use the Floating Convert to Integer Word with | |
| 30 | round to zero instruction. */ | |
| 31 | ||
| 32 | .machine "power6" | |
| 33 | ENTRY (__lround) | |
| 34 | frin fp2,fp1 /* Pre-round +-0.5. */ | |
| 35 | fctiwz fp3,fp2 /* Convert To Integer Word lround toward 0. */ | |
| 36 | mftgpr r3,fp3 /* Transfer fpr3 to r3. */ | |
| 37 | blr | |
| 38 | END (__lround) | |
| 39 | ||
| 40 | weak_alias (__lround, lround) | |
| 41 | ||
| 42 | strong_alias (__lround, __lroundf) | |
| 43 | weak_alias (__lround, lroundf) | |
| 44 | ||
| 45 | #ifdef NO_LONG_DOUBLE | |
| 46 | weak_alias (__lround, lroundl) | |
| 47 | strong_alias (__lround, __lroundl) | |
| 48 | #endif | |
| 49 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) | |
| 50 | compat_symbol (libm, __lround, lroundl, GLIBC_2_1) | |
| 51 | #endif |