projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04067002 | 1 | /* lround function. POWER5+, PowerPC32 version. |
| b168057a | 2 | Copyright (C) 2006-2015 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] llround (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 "power5" | |
| 33 | ENTRY (__llround) | |
| 34 | stwu r1,-16(r1) | |
| 35 | cfi_adjust_cfa_offset (16) | |
| 36 | frin fp2,fp1 | |
| 37 | fctidz fp3,fp2 /* Convert To Integer Word lround toward 0. */ | |
| 38 | stfd fp3,8(r1) | |
| 39 | nop /* Ensure the following load is in a different dispatch */ | |
| 40 | nop /* group to avoid pipe stall on POWER4&5. */ | |
| 41 | nop | |
| 7b88401f AM |
42 | lwz r3,8+HIWORD(r1) |
| 43 | lwz r4,8+LOWORD(r1) | |
| 04067002 UD |
44 | addi r1,r1,16 |
| 45 | blr | |
| 46 | END (__llround) | |
| 47 | ||
| 48 | weak_alias (__llround, llround) | |
| 49 | ||
| 50 | strong_alias (__llround, __llroundf) | |
| 51 | weak_alias (__llround, llroundf) | |
| 52 | ||
| 53 | #ifdef NO_LONG_DOUBLE | |
| 54 | weak_alias (__llround, llroundl) | |
| 55 | strong_alias (__llround, __llroundl) | |
| 56 | #endif | |
| 57 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) | |
| 58 | compat_symbol (libm, __llround, llroundl, GLIBC_2_1) | |
| 59 | #endif |