]>
Commit | Line | Data |
---|---|---|
1aa61767 DM |
1 | /* Truncate argument to nearest integral value not larger than |
2 | the argument, sparc64 version. | |
3 | ||
b168057a | 4 | Copyright (C) 2013-2015 Free Software Foundation, Inc. |
1aa61767 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 | ||
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_FIFTYTWO 0x43300000 /* 2**52 */ | |
33 | ||
34 | #define ZERO %f10 /* 0.0 */ | |
35 | #define SIGN_BIT %f12 /* -0.0 */ | |
36 | ||
37 | ENTRY (__trunc) | |
38 | sethi %hi(TWO_FIFTYTWO), %o2 | |
39 | sllx %o2, 32, %o2 | |
40 | fzero ZERO | |
41 | fnegd ZERO, SIGN_BIT | |
42 | stx %o2, [%sp + STACK_BIAS + 128] | |
43 | fabsd %f0, %f14 | |
44 | ldd [%sp + STACK_BIAS + 128], %f16 | |
45 | fcmpd %fcc3, %f14, %f16 | |
46 | fmovduge %fcc3, ZERO, %f14 | |
47 | fand %f0, SIGN_BIT, SIGN_BIT | |
48 | fdtox %f14, %f14 | |
49 | fxtod %f14, %f14 | |
50 | faddd %f0, ZERO, %f18 | |
51 | fmovduge %fcc3, %f18, %f14 | |
52 | retl | |
53 | for %f14, SIGN_BIT, %f0 | |
54 | END (__trunc) | |
55 | weak_alias (__trunc, trunc) |