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6358490d DM |
1 | /* lrint(), sparc32 v9 version. |
2 | Copyright (C) 2012 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by David S. Miller <davem@davemloft.net>, 2012. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <sysdep.h> | |
33f244f4 | 21 | #include <math_ldbl_opt.h> |
6358490d DM |
22 | |
23 | /* We pop constants into the FPU registers using the incoming | |
24 | argument stack slots, since this avoid having to use any PIC | |
25 | references. We also thus avoid having to allocate a register | |
26 | window. | |
27 | ||
28 | VIS instructions are used to facilitate the formation of | |
29 | easier constants, and the propagation of the sign bit. */ | |
30 | ||
31 | #define TWO_FIFTYTWO 0x43300000 /* 2**52 */ | |
32 | ||
33 | #define ZERO %f10 /* 0.0 */ | |
34 | #define SIGN_BIT %f12 /* -0.0 */ | |
35 | ||
36 | ENTRY (__lrint) | |
37 | sethi %hi(TWO_FIFTYTWO), %o2 | |
38 | sllx %o0, 32, %o0 | |
39 | ||
40 | or %o0, %o1, %o0 | |
41 | fzero ZERO | |
42 | ||
43 | stx %o0, [%sp + 72] | |
44 | sllx %o2, 32, %o2 | |
45 | fnegd ZERO, SIGN_BIT | |
46 | ||
47 | ldd [%sp + 72], %f0 | |
48 | ||
49 | stx %o2, [%sp + 72] | |
50 | fabsd %f0, %f14 | |
51 | ||
52 | ldd [%sp + 72], %f16 | |
53 | fcmpd %fcc3, %f14, %f16 | |
54 | ||
55 | fmovduge %fcc3, ZERO, %f16 | |
56 | fand %f0, SIGN_BIT, SIGN_BIT | |
57 | ||
58 | for %f16, SIGN_BIT, %f16 | |
59 | faddd %f0, %f16, %f6 | |
60 | fsubd %f6, %f16, %f0 | |
61 | fabsd %f0, %f0 | |
62 | for %f0, SIGN_BIT, %f0 | |
63 | fdtoi %f0, %f3 | |
64 | st %f3, [%sp + 72] | |
65 | retl | |
66 | ld [%sp + 72], %o0 | |
67 | END (__lrint) | |
68 | weak_alias (__lrint, lrint) | |
33f244f4 DM |
69 | |
70 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1) | |
71 | compat_symbol (libm, __lrint, lrintl, GLIBC_2_1) | |
72 | #endif |