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1 | /* Round float to int floating-point values without generating |
2 | an inexact exception, sparc32 v9 version. | |
3 | ||
4 | Copyright (C) 2013 Free Software Foundation, Inc. | |
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 | ||
24 | /* We pop constants into the FPU registers using the incoming | |
25 | argument stack slots, since this avoid having to use any PIC | |
26 | references. We also thus avoid having to allocate a register | |
27 | window. | |
28 | ||
29 | VIS instructions are used to facilitate the formation of | |
30 | easier constants, and the propagation of the sign bit. */ | |
31 | ||
32 | #define TWO_TWENTYTHREE 0x4b000000 /* 2**23 */ | |
33 | ||
34 | #define ZERO %f10 /* 0.0 */ | |
35 | #define SIGN_BIT %f12 /* -0.0 */ | |
36 | ||
37 | ENTRY (__nearbyintf) | |
38 | st %fsr, [%sp + 88] | |
39 | st %o0, [%sp + 68] | |
40 | sethi %hi(TWO_TWENTYTHREE), %o2 | |
41 | sethi %hi(0xf8003e0), %o5 | |
42 | ld [%sp + 88], %o4 | |
43 | fzeros ZERO | |
44 | or %o5, %lo(0xf8003e0), %o5 | |
45 | fnegs ZERO, SIGN_BIT | |
46 | andn %o4, %o5, %o4 | |
47 | st %o4, [%sp + 80] | |
48 | ld [%sp + 68], %f1 | |
49 | ld [%sp + 80], %fsr | |
50 | st %o2, [%sp + 68] | |
51 | fabss %f1, %f14 | |
52 | ld [%sp + 68], %f16 | |
53 | fcmps %fcc3, %f14, %f16 | |
54 | fmovsuge %fcc3, ZERO, %f16 | |
55 | fands %f1, SIGN_BIT, SIGN_BIT | |
56 | fors %f16, SIGN_BIT, %f16 | |
57 | fadds %f1, %f16, %f5 | |
58 | fsubs %f5, %f16, %f0 | |
59 | fabss %f0, %f0 | |
60 | fors %f0, SIGN_BIT, %f0 | |
61 | retl | |
62 | ld [%sp + 88], %fsr | |
63 | END (__nearbyintf) | |
64 | weak_alias (__nearbyintf, nearbyintf) |