| /* lround function. POWER5+, PowerPC32 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 [r3] llround (float x [fp1]) |
| IEEE 1003.1 lround 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 the Floating Convert to Integer Word with |
| round to zero instruction. */ |
| |
| .machine "power5" |
| ENTRY (__llround) |
| stwu r1,-16(r1) |
| cfi_adjust_cfa_offset (16) |
| frin fp2,fp1 |
| fctidz fp3,fp2 /* Convert To Integer Word lround toward 0. */ |
| stfd fp3,8(r1) |
| nop /* Ensure the following load is in a different dispatch */ |
| nop /* group to avoid pipe stall on POWER4&5. */ |
| nop |
| lwz r3,8+HIWORD(r1) |
| lwz r4,8+LOWORD(r1) |
| addi r1,r1,16 |
| blr |
| END (__llround) |
| |
| libm_alias_double (__llround, llround) |
| |
| strong_alias (__llround, __llroundf) |
| libm_alias_float (__llround, llround) |
