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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_TWENTYTHREE 0x4b000000 /* 2**23 */ | |
33 | ||
34 | #define ZERO %f10 /* 0.0 */ | |
35 | #define SIGN_BIT %f12 /* -0.0 */ | |
36 | ||
37 | ENTRY (__truncf) | |
38 | sethi %hi(TWO_TWENTYTHREE), %o2 | |
39 | fzeros ZERO | |
40 | fnegs ZERO, SIGN_BIT | |
41 | st %o2, [%sp + STACK_BIAS + 128] | |
42 | fabss %f1, %f14 | |
43 | ld [%sp + STACK_BIAS + 128], %f16 | |
44 | fcmps %fcc3, %f14, %f16 | |
45 | fmovsuge %fcc3, ZERO, %f14 | |
46 | fands %f1, SIGN_BIT, SIGN_BIT | |
47 | fstoi %f14, %f14 | |
48 | fitos %f14, %f14 | |
49 | fadds %f1, ZERO, %f18 | |
50 | fmovsuge %fcc3, %f18, %f14 | |
51 | retl | |
52 | fors %f14, SIGN_BIT, %f0 | |
53 | END (__truncf) | |
54 | weak_alias (__truncf, truncf) |