| /* llround function. POWER6x PowerPC64 version. |
| Copyright (C) 2006-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #include <math_ldbl_opt.h> |
| #include <libm-alias-float.h> |
| #include <libm-alias-double.h> |
| |
| /* long long [r3] llround (float x [fp1]) |
| IEEE 1003.1 llround function. IEEE specifies "round to the nearest |
| integer value, rounding halfway cases away from zero, regardless of |
| the current rounding mode." However PowerPC Architecture defines |
| "round to Nearest" as "Choose the best approximation. In case of a |
| tie, choose the one that is even (least significant bit o).". |
| So we pre-round using the V2.02 Floating Round to Integer Nearest |
| instruction before we use Floating Convert to Integer Word with |
| round to zero instruction. */ |
| |
| .machine "power6" |
| ENTRY_TOCLESS (__llround) |
| CALL_MCOUNT 0 |
| frin fp2,fp1 /* Round to nearest +-0.5. */ |
| fctidz fp3,fp2 /* Convert To Integer DW round toward 0. */ |
| mftgpr r3,fp3 /* Transfer integer to R3. */ |
| blr |
| END (__llround) |
| |
| strong_alias (__llround, __lround) |
| libm_alias_double (__llround, llround) |
| libm_alias_double (__lround, lround) |
| /* The double version also works for single-precision as both float and |
| double parameters are passed in 64bit FPRs and both versions are expected |
| to return [long] long type. */ |
| strong_alias (__llround, __llroundf) |
| libm_alias_float (__llround, llround) |
| strong_alias (__lround, __lroundf) |
| libm_alias_float (__lround, lround) |
