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8ade3db7 | 1 | /* Vector optimized 32/64 bit S/390 version of wcpcpy. |
2b778ceb | 2 | Copyright (C) 2015-2021 Free Software Foundation, Inc. |
8ade3db7 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/>. */ |
8ade3db7 | 18 | |
0582e428 SL |
19 | #include <ifunc-wcpcpy.h> |
20 | #if HAVE_WCPCPY_Z13 | |
8ade3db7 SL |
21 | |
22 | # include "sysdep.h" | |
23 | # include "asm-syntax.h" | |
24 | ||
25 | .text | |
26 | ||
27 | /* wchar_t * wcpcpy (const wchar_t *dest, const wchar_t *src) | |
28 | Copy string src to dest returning a pointer to its end. | |
29 | ||
30 | Register usage: | |
31 | -r0=border-len for switching to vector-instructions | |
32 | -r1=tmp | |
33 | -r2=dest and return value | |
34 | -r3=src | |
35 | -r4=tmp | |
36 | -r5=current_len | |
37 | -v16=part of src | |
38 | -v17=index of zero | |
39 | -v18=part of src | |
40 | */ | |
0582e428 | 41 | ENTRY(WCPCPY_Z13) |
8ade3db7 SL |
42 | .machine "z13" |
43 | .machinemode "zarch_nohighgprs" | |
44 | ||
45 | vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */ | |
46 | lcbb %r1,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */ | |
47 | ||
48 | tmll %r3,3 /* Test if s is 4-byte aligned? */ | |
49 | jne .Lfallback /* And use common-code variant if not. */ | |
50 | ||
51 | vfenezf %v17,%v16,%v16 /* Find element not equal with zero search. */ | |
52 | vlgvb %r5,%v17,7 /* Load zero index or 16 if not found. */ | |
53 | clrjl %r5,%r1,.Lfound_align /* If found zero within loaded bytes, | |
54 | copy bytes before and return. */ | |
55 | ||
56 | /* Align s to 16 byte. */ | |
57 | risbgn %r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ | |
58 | lghi %r5,15 /* current_len = 15. */ | |
59 | slr %r5,%r4 /* Compute highest index to 16byte boundary. */ | |
60 | ||
61 | vstl %v16,%r5,0(%r2) /* Copy loaded characters - no zero. */ | |
62 | ahi %r5,1 /* Start loop at next character. */ | |
63 | ||
64 | /* Find zero in 16byte aligned loop. */ | |
65 | .Lloop: | |
66 | vl %v16,0(%r5,%r3) /* Load s. */ | |
67 | vfenezfs %v17,%v16,%v16 /* Find element not equal with zero search. */ | |
68 | je .Lfound_v16_0 /* Jump away if zero was found. */ | |
69 | vl %v18,16(%r5,%r3) /* Load next part of s. */ | |
70 | vst %v16,0(%r5,%r2) /* Store previous part without zero to dst. */ | |
71 | vfenezfs %v17,%v18,%v18 | |
72 | je .Lfound_v18_16 | |
73 | vl %v16,32(%r5,%r3) | |
74 | vst %v18,16(%r5,%r2) | |
75 | vfenezfs %v17,%v16,%v16 | |
76 | je .Lfound_v16_32 | |
77 | vl %v18,48(%r5,%r3) | |
78 | vst %v16,32(%r5,%r2) | |
79 | vfenezfs %v17,%v18,%v18 | |
80 | je .Lfound_v18_48 | |
81 | vst %v18,48(%r5,%r2) | |
82 | ||
83 | aghi %r5,64 | |
84 | j .Lloop /* No zero found -> loop. */ | |
85 | ||
86 | .Lfound_v16_32: | |
87 | aghi %r5,32 | |
88 | .Lfound_v16_0: | |
89 | la %r3,0(%r5,%r2) | |
90 | vlgvb %r1,%v17,7 /* Load byte index of zero. */ | |
91 | aghi %r1,3 /* Also copy remaining bytes of zero. */ | |
92 | vstl %v16,%r1,0(%r3) /* Copy characters including zero. */ | |
93 | lay %r2,-3(%r1,%r3) /* Return pointer to zero. */ | |
94 | br %r14 | |
95 | ||
96 | .Lfound_v18_48: | |
97 | aghi %r5,32 | |
98 | .Lfound_v18_16: | |
99 | la %r3,16(%r5,%r2) | |
100 | vlgvb %r1,%v17,7 /* Load byte index of zero. */ | |
101 | aghi %r1,3 /* Also copy remaining bytes of zero. */ | |
102 | vstl %v18,%r1,0(%r3) /* Copy characters including zero. */ | |
103 | lay %r2,-3(%r1,%r3) /* Return pointer to zero. */ | |
104 | br %r14 | |
105 | ||
106 | .Lfound_align: | |
107 | aghi %r5,3 /* Also copy remaining bytes of zero. */ | |
108 | vstl %v16,%r5,0(%r2) /* Copy characters including zero. */ | |
109 | lay %r2,-3(%r5,%r2) /* Return pointer to zero. */ | |
110 | br %r14 | |
111 | ||
112 | .Lfallback: | |
0582e428 SL |
113 | jg WCPCPY_C |
114 | END(WCPCPY_Z13) | |
115 | ||
116 | # if ! HAVE_WCPCPY_IFUNC | |
117 | strong_alias (WCPCPY_Z13, __wcpcpy) | |
118 | weak_alias (__wcpcpy, wcpcpy) | |
119 | # endif | |
120 | #endif |