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04067002 | 1 | /* lround function. POWER6x, PowerPC32 version. |
04277e02 | 2 | Copyright (C) 2006-2019 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 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
04067002 UD |
18 | |
19 | #include <sysdep.h> | |
20 | #include <math_ldbl_opt.h> | |
216933b2 | 21 | #include <libm-alias-float.h> |
d17542d2 | 22 | #include <libm-alias-double.h> |
9c84384c | 23 | |
04067002 | 24 | /* long [r3] lround (float x [fp1]) |
9c84384c | 25 | IEEE 1003.1 lround function. IEEE specifies "round to the nearest |
04067002 UD |
26 | integer value, rounding halfway cases away from zero, regardless of |
27 | the current rounding mode." However PowerPC Architecture defines | |
9c84384c JM |
28 | "round to Nearest" as "Choose the best approximation. In case of a |
29 | tie, choose the one that is even (least significant bit o).". | |
04067002 UD |
30 | So we pre-round using the V2.02 Floating Round to Integer Nearest |
31 | instruction before we use the Floating Convert to Integer Word with | |
32 | round to zero instruction. */ | |
33 | ||
34 | .machine "power6" | |
35 | ENTRY (__lround) | |
36 | frin fp2,fp1 /* Pre-round +-0.5. */ | |
37 | fctiwz fp3,fp2 /* Convert To Integer Word lround toward 0. */ | |
38 | mftgpr r3,fp3 /* Transfer fpr3 to r3. */ | |
39 | blr | |
40 | END (__lround) | |
41 | ||
d17542d2 | 42 | libm_alias_double (__lround, lround) |
04067002 UD |
43 | |
44 | strong_alias (__lround, __lroundf) | |
216933b2 | 45 | libm_alias_float (__lround, lround) |