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d23d4ef1 | 1 | /* Vector optimized 32/64 bit S/390 version of wcschrnul. |
6d7e8eda | 2 | Copyright (C) 2015-2023 Free Software Foundation, Inc. |
d23d4ef1 SL |
3 | This file is part of the GNU C Library. |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
d23d4ef1 | 18 | |
c09c1b6f SL |
19 | #include <ifunc-wcschrnul.h> |
20 | #if HAVE_WCSCHRNUL_Z13 | |
d23d4ef1 SL |
21 | |
22 | # include "sysdep.h" | |
23 | # include "asm-syntax.h" | |
24 | ||
25 | .text | |
26 | ||
27 | /* wchar_t* wcschrnul (const wchar_t *s, wchar_t c) | |
28 | Returns pointer to first c or to \0 if c not found. | |
29 | ||
30 | Register usage: | |
31 | -r1=tmp | |
32 | -r2=s and return pointer | |
33 | -r3=c | |
34 | -r4=tmp | |
35 | -r5=current_len | |
36 | -v16=part of s | |
37 | -v18=vector with c replicated in every byte | |
38 | */ | |
c09c1b6f | 39 | ENTRY(WCSCHRNUL_Z13) |
d23d4ef1 SL |
40 | .machine "z13" |
41 | .machinemode "zarch_nohighgprs" | |
42 | ||
43 | vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ | |
44 | lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ | |
45 | ||
46 | tmll %r2,3 /* Test if s is 4-byte aligned? */ | |
47 | jne .Lfallback /* And use common-code variant if not. */ | |
48 | ||
49 | lghi %r5,0 /* current_len = 0. */ | |
50 | ||
51 | vlvgf %v18,%r3,0 /* Generate vector which elements are all c. */ | |
52 | vrepf %v18,%v18,0 | |
53 | ||
54 | vfeezfs %v16,%v16,%v18 /* Find element equal with zero search. */ | |
55 | vlgvb %r4,%v16,7 /* Load byte index of character or zero. */ | |
56 | clrjl %r4,%r1,.Lfound /* Return if c/zero is in loaded bytes. */ | |
57 | ||
58 | /* Align s to 16 byte. */ | |
59 | risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ | |
60 | lghi %r5,16 /* current_len = 16. */ | |
61 | slr %r5,%r4 /* Compute bytes to 16bytes boundary. */ | |
62 | ||
63 | /* Find c/zero in 16byte aligned loop */ | |
64 | .Lloop: | |
65 | vl %v16,0(%r5,%r2) /* Load s. */ | |
66 | vfeezfs %v16,%v16,%v18 /* Find element equal with zero search. */ | |
67 | jno .Lfound /* Found c/zero (cc=0|1|2). */ | |
68 | vl %v16,16(%r5,%r2) | |
69 | vfeezfs %v16,%v16,%v18 | |
70 | jno .Lfound16 | |
71 | vl %v16,32(%r5,%r2) | |
72 | vfeezfs %v16,%v16,%v18 | |
73 | jno .Lfound32 | |
74 | vl %v16,48(%r5,%r2) | |
75 | vfeezfs %v16,%v16,%v18 | |
76 | jno .Lfound48 | |
77 | ||
78 | aghi %r5,64 | |
79 | j .Lloop /* No character and no zero -> loop. */ | |
80 | ||
81 | /* Found character or zero */ | |
82 | .Lfound48: | |
83 | aghi %r5,16 | |
84 | .Lfound32: | |
85 | aghi %r5,16 | |
86 | .Lfound16: | |
87 | aghi %r5,16 | |
88 | .Lfound: | |
89 | vlgvb %r1,%v16,7 /* Load byte index of character. */ | |
90 | algr %r5,%r1 | |
91 | la %r2,0(%r5,%r2) /* Return pointer to character. */ | |
92 | ||
93 | .Lend: | |
94 | br %r14 | |
95 | .Lfallback: | |
c09c1b6f SL |
96 | jg WCSCHRNUL_C |
97 | END(WCSCHRNUL_Z13) | |
98 | ||
99 | # if ! HAVE_WCSCHRNUL_IFUNC | |
100 | strong_alias (WCSCHRNUL_Z13, __wcschrnul) | |
101 | weak_alias (__wcschrnul, wcschrnul) | |
102 | # endif | |
103 | #endif |