Warning: That file was not part of the compilation database. It may have many parsing errors.
1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. |
---|---|
2 | This file is part of the GNU C Library. |
3 | Contributed by Richard Henderson <rth@tamu.edu>, 1996. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ |
18 | |
19 | /* Append a null-terminated string from SRC to DST. */ |
20 | |
21 | #include <sysdep.h> |
22 | |
23 | .text |
24 | |
25 | ENTRY(strcat) |
26 | ldgp gp, 0(pv) |
27 | #ifdef PROF |
28 | .set noat |
29 | lda AT, _mcount |
30 | jsr AT, (AT), _mcount |
31 | .set at |
32 | #endif |
33 | .prologue 1 |
34 | |
35 | mov a0, v0 # set up return value |
36 | |
37 | /* Find the end of the string. */ |
38 | |
39 | ldq_u t0, 0(a0) # load first quadword (a0 may be misaligned) |
40 | lda t1, -1(zero) |
41 | insqh t1, a0, t1 |
42 | andnot a0, 7, a0 |
43 | or t1, t0, t0 |
44 | cmpbge zero, t0, t1 # t1 <- bitmask: bit i == 1 <==> i-th byte == 0 |
45 | bne t1, $found |
46 | |
47 | $loop: ldq t0, 8(a0) |
48 | addq a0, 8, a0 # addr += 8 |
49 | cmpbge zero, t0, t1 |
50 | beq t1, $loop |
51 | |
52 | $found: negq t1, t2 # clear all but least set bit |
53 | and t1, t2, t1 |
54 | |
55 | and t1, 0xf0, t2 # binary search for that set bit |
56 | and t1, 0xcc, t3 |
57 | and t1, 0xaa, t4 |
58 | cmovne t2, 4, t2 |
59 | cmovne t3, 2, t3 |
60 | cmovne t4, 1, t4 |
61 | addq t2, t3, t2 |
62 | addq a0, t4, a0 |
63 | addq a0, t2, a0 |
64 | |
65 | /* Now do the append. */ |
66 | |
67 | mov ra, t9 |
68 | jmp $31, __stxcpy |
69 | |
70 | END(strcat) |
71 | libc_hidden_builtin_def (strcat) |
72 |
Warning: That file was not part of the compilation database. It may have many parsing errors.