projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 0ecb606c JJ |
1 | /* lround function. POWER6x, PowerPC32 version. |
| 2 | Copyright (C) 2006 Free Software Foundation, Inc. | |
| 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 | |
| 16 | License along with the GNU C Library; if not, write to the Free | |
| 17 | Software Foundation, Inc., 1 Franklin Street, Fifth Floor, Boston MA | |
| 18 | 02110-1301 USA. */ | |
| 19 | ||
| 20 | #include <sysdep.h> | |
| 21 | #include <math_ldbl_opt.h> | |
| 22 | ||
| 23 | /* long [r3] lround (float x [fp1]) | |
| 24 | IEEE 1003.1 lround function. IEEE specifies "round to the nearest | |
| 25 | integer value, rounding halfway cases away from zero, regardless of | |
| 26 | the current rounding mode." However PowerPC Architecture defines | |
| 27 | "round to Nearest" as "Choose the best approximation. In case of a | |
| 28 | tie, choose the one that is even (least significant bit o).". | |
| 29 | So we pre-round using the V2.02 Floating Round to Integer Nearest | |
| 30 | instruction before we use the Floating Convert to Integer Word with | |
| 31 | round to zero instruction. */ | |
| 32 | ||
| 33 | .machine "power6" | |
| 34 | ENTRY (__lround) | |
| 35 | frin fp2,fp1 /* Pre-round +-0.5. */ | |
| 36 | fctiwz fp3,fp2 /* Convert To Integer Word lround toward 0. */ | |
| 37 | mftgpr r3,fp3 /* Transfer fpr3 to r3. */ | |
| 38 | blr | |
| 39 | END (__lround) | |
| 40 | ||
| 41 | weak_alias (__lround, lround) | |
| 42 | ||
| 43 | strong_alias (__lround, __lroundf) | |
| 44 | weak_alias (__lround, lroundf) | |
| 45 | ||
| 46 | #ifdef NO_LONG_DOUBLE | |
| 47 | weak_alias (__lround, lroundl) | |
| 48 | strong_alias (__lround, __lroundl) | |
| 49 | #endif | |
| 50 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) | |
| 51 | compat_symbol (libm, __lround, lroundl, GLIBC_2_1) | |
| 52 | #endif |