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c42d5e98 DM |
1 | /* Round float to int floating-point values without generating |
2 | an inexact exception, sparc32 v9 version. | |
3 | ||
04277e02 | 4 | Copyright (C) 2013-2019 Free Software Foundation, Inc. |
c42d5e98 DM |
5 | This file is part of the GNU C Library. |
6 | Contributed by David S. Miller <davem@davemloft.net>, 2013. | |
7 | ||
8 | The GNU C Library is free software; you can redistribute it and/or | |
9 | modify it under the terms of the GNU Lesser General Public | |
10 | License as published by the Free Software Foundation; either | |
11 | version 2.1 of the License, or (at your option) any later version. | |
12 | ||
13 | The GNU C Library is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public | |
19 | License along with the GNU C Library; if not, see | |
20 | <http://www.gnu.org/licenses/>. */ | |
21 | ||
22 | #include <sysdep.h> | |
23 | #include <math_ldbl_opt.h> | |
875cd548 | 24 | #include <libm-alias-double.h> |
c42d5e98 DM |
25 | |
26 | /* We pop constants into the FPU registers using the incoming | |
27 | argument stack slots, since this avoid having to use any PIC | |
28 | references. We also thus avoid having to allocate a register | |
29 | window. | |
30 | ||
31 | VIS instructions are used to facilitate the formation of | |
32 | easier constants, and the propagation of the sign bit. */ | |
33 | ||
34 | #define TWO_FIFTYTWO 0x43300000 /* 2**52 */ | |
35 | ||
36 | #define ZERO %f10 /* 0.0 */ | |
37 | #define SIGN_BIT %f12 /* -0.0 */ | |
38 | ||
39 | ENTRY (__nearbyint) | |
3ef3f1b9 DM |
40 | sllx %o0, 32, %o0 |
41 | or %o0, %o1, %o0 | |
42 | stx %o0, [%sp + 72] | |
43 | ldd [%sp + 72], %f0 | |
2cbec365 | 44 | fcmpd %fcc3, %f0, %f0 /* Check for sNaN */ |
c42d5e98 DM |
45 | st %fsr, [%sp + 88] |
46 | sethi %hi(TWO_FIFTYTWO), %o2 | |
47 | sethi %hi(0xf8003e0), %o5 | |
48 | ld [%sp + 88], %o4 | |
c42d5e98 | 49 | or %o5, %lo(0xf8003e0), %o5 |
c42d5e98 DM |
50 | andn %o4, %o5, %o4 |
51 | fzero ZERO | |
52 | st %o4, [%sp + 80] | |
c42d5e98 DM |
53 | sllx %o2, 32, %o2 |
54 | fnegd ZERO, SIGN_BIT | |
c42d5e98 DM |
55 | ld [%sp + 80], %fsr |
56 | stx %o2, [%sp + 72] | |
57 | fabsd %f0, %f14 | |
58 | ldd [%sp + 72], %f16 | |
59 | fcmpd %fcc3, %f14, %f16 | |
60 | fmovduge %fcc3, ZERO, %f16 | |
61 | fand %f0, SIGN_BIT, SIGN_BIT | |
62 | for %f16, SIGN_BIT, %f16 | |
63 | faddd %f0, %f16, %f6 | |
64 | fsubd %f6, %f16, %f0 | |
65 | fabsd %f0, %f0 | |
66 | for %f0, SIGN_BIT, %f0 | |
67 | retl | |
68 | ld [%sp + 88], %fsr | |
69 | END (__nearbyint) | |
875cd548 | 70 | libm_alias_double (__nearbyint, nearbyint) |