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428d5830 | 1 | /* Round float to int floating-point values, sparc64 version. |
6d7e8eda | 2 | Copyright (C) 2012-2023 Free Software Foundation, Inc. |
428d5830 | 3 | This file is part of the GNU C Library. |
428d5830 DM |
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, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
428d5830 DM |
18 | |
19 | #include <sysdep.h> | |
875cd548 | 20 | #include <libm-alias-double.h> |
428d5830 DM |
21 | |
22 | /* We pop constants into the FPU registers using the incoming | |
d674b76d DM |
23 | argument stack slots, since this avoid having to use any PIC |
24 | references. We also thus avoid having to allocate a register | |
25 | window. | |
26 | ||
27 | VIS instructions are used to facilitate the formation of | |
28 | easier constants, and the propagation of the sign bit. */ | |
428d5830 DM |
29 | |
30 | #define TWO_FIFTYTWO 0x43300000 /* 2**52 */ | |
31 | ||
32 | #define ZERO %f10 /* 0.0 */ | |
33 | #define SIGN_BIT %f12 /* -0.0 */ | |
34 | ||
35 | ENTRY (__rint) | |
36 | sethi %hi(TWO_FIFTYTWO), %o2 | |
37 | sllx %o2, 32, %o2 | |
38 | fzero ZERO | |
39 | ||
40 | fnegd ZERO, SIGN_BIT | |
41 | stx %o2, [%sp + STACK_BIAS + 128] | |
42 | fabsd %f0, %f14 | |
43 | ||
44 | ldd [%sp + STACK_BIAS + 128], %f16 | |
45 | fcmpd %fcc3, %f14, %f16 | |
46 | ||
47 | fmovduge %fcc3, ZERO, %f16 | |
48 | fand %f0, SIGN_BIT, SIGN_BIT | |
49 | ||
50 | for %f16, SIGN_BIT, %f16 | |
51 | faddd %f0, %f16, %f6 | |
52 | fsubd %f6, %f16, %f0 | |
53 | fabsd %f0, %f0 | |
54 | retl | |
55 | for %f0, SIGN_BIT, %f0 | |
56 | END (__rint) | |
875cd548 | 57 | libm_alias_double (__rint, rint) |