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63724a6d | 1 | /* Vector optimized 32/64 bit S/390 version of wcscmp. |
581c785b | 2 | Copyright (C) 2015-2022 Free Software Foundation, Inc. |
63724a6d 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/>. */ |
63724a6d | 18 | |
3459e23d SL |
19 | #include <ifunc-wcscmp.h> |
20 | #if HAVE_WCSCMP_Z13 | |
63724a6d SL |
21 | |
22 | # include "sysdep.h" | |
23 | # include "asm-syntax.h" | |
24 | ||
25 | .text | |
26 | ||
27 | /* int wcscmp (const wchar_t *s1, const wchar_t *s2) | |
28 | Compare two strings | |
29 | ||
30 | Register usage: | |
31 | -r1=loaded byte count s1 | |
32 | -r2=s1 | |
33 | -r3=s2 | |
34 | -r4=loaded byte coutn s2, tmp | |
35 | -r5=current_len | |
36 | -v16=part of s1 | |
37 | -v17=part of s2 | |
38 | -v18=index of unequal | |
39 | */ | |
3459e23d | 40 | ENTRY(WCSCMP_Z13) |
63724a6d SL |
41 | .machine "z13" |
42 | .machinemode "zarch_nohighgprs" | |
43 | ||
44 | lghi %r5,0 /* current_len = 0. */ | |
45 | ||
46 | .Lloop: | |
47 | vlbb %v16,0(%r5,%r2),6 /* Load s1 to block boundary. */ | |
48 | vlbb %v17,0(%r5,%r3),6 /* Load s2 to block boundary. */ | |
49 | lcbb %r1,0(%r5,%r2),6 /* Get loaded byte count of s1. */ | |
50 | jo .Llt16_1 /* Jump away if vr is not fully loaded. */ | |
51 | lcbb %r4,0(%r5,%r3),6 | |
52 | jo .Llt16_2 /* Jump away if vr is not fully loaded. */ | |
53 | /* Both vrs are fully loaded. */ | |
54 | aghi %r5,16 | |
55 | vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */ | |
56 | jno .Lfound | |
57 | ||
58 | vlbb %v16,0(%r5,%r2),6 | |
59 | vlbb %v17,0(%r5,%r3),6 | |
60 | lcbb %r1,0(%r5,%r2),6 | |
61 | jo .Llt16_1 | |
62 | lcbb %r4,0(%r5,%r3),6 | |
63 | jo .Llt16_2 | |
64 | aghi %r5,16 | |
65 | vfenezfs %v18,%v16,%v17 | |
66 | jno .Lfound | |
67 | ||
68 | vlbb %v16,0(%r5,%r2),6 | |
69 | vlbb %v17,0(%r5,%r3),6 | |
70 | lcbb %r1,0(%r5,%r2),6 | |
71 | jo .Llt16_1 | |
72 | lcbb %r4,0(%r5,%r3),6 | |
73 | jo .Llt16_2 | |
74 | aghi %r5,16 | |
75 | vfenezfs %v18,%v16,%v17 | |
76 | jno .Lfound | |
77 | ||
78 | vlbb %v16,0(%r5,%r2),6 | |
79 | vlbb %v17,0(%r5,%r3),6 | |
80 | lcbb %r1,0(%r5,%r2),6 | |
81 | jo .Llt16_1 | |
82 | lcbb %r4,0(%r5,%r3),6 | |
83 | jo .Llt16_2 | |
84 | aghi %r5,16 | |
85 | vfenezfs %v18,%v16,%v17 | |
86 | jno .Lfound | |
87 | j .Lloop | |
88 | ||
89 | .Lcmp_one_char: | |
90 | /* At least one of both strings is not 4-byte aligned | |
91 | and there is no full character before next block-boundary. | |
92 | Compare one character to get over the boundary and | |
93 | proceed with normal loop! */ | |
94 | vlef %v16,0(%r5,%r2),0 /* Load one character. */ | |
95 | vlef %v17,0(%r5,%r3),0 | |
96 | lghi %r1,4 /* Loaded byte count is 4. */ | |
97 | j .Llt_cmp /* Proceed with comparision. */ | |
98 | ||
99 | .Llt16_1: | |
100 | lcbb %r4,0(%r5,%r3),6 /* Get loaded byte count of s2. */ | |
101 | .Llt16_2: | |
102 | clr %r1,%r4 | |
103 | locrh %r1,%r4 /* Get minimum of bytes loaded in s1/2. */ | |
104 | nill %r1,65532 /* Align bytes loaded to full characters. */ | |
105 | jz .Lcmp_one_char /* Jump away if no full char is available. */ | |
106 | .Llt_cmp: | |
107 | algfr %r5,%r1 /* Add smallest loaded bytes to current_len. */ | |
108 | vfenezfs %v18,%v16,%v17 /* Compare not equal with zero search. */ | |
109 | vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */ | |
110 | clrjl %r4,%r1,.Lfound /* Jump away if miscompare is within loaded | |
111 | bytes. */ | |
112 | j .Lloop | |
113 | ||
114 | .Lfound: | |
115 | /* vfenezf found an unequal element or zero. | |
116 | This instruction compares unsigned words, but wchar_t is signed. | |
117 | Thus we have to compare the found element again. */ | |
118 | vlgvb %r4,%v18,7 /* Extract not equal byte-index, */ | |
119 | srl %r4,2 /* Convert it to character-index. */ | |
120 | vlgvf %r3,%v16,0(%r4) /* Load character-values. */ | |
121 | vlgvf %r4,%v17,0(%r4) | |
122 | cr %r3,%r4 | |
123 | je .Lend_equal | |
124 | lghi %r2,1 | |
125 | lghi %r1,-1 | |
126 | locgrl %r2,%r1 | |
127 | br %r14 | |
128 | .Lend_equal: | |
129 | lghi %r2,0 | |
130 | br %r14 | |
3459e23d SL |
131 | END(WCSCMP_Z13) |
132 | ||
133 | # if ! HAVE_WCSCMP_IFUNC | |
134 | strong_alias (WCSCMP_Z13, __wcscmp) | |
135 | weak_alias (__wcscmp, wcscmp) | |
136 | # endif | |
137 | ||
138 | # if ! HAVE_WCSCMP_C && defined SHARED && IS_IN (libc) | |
139 | strong_alias (WCSCMP_Z13, __GI___wcscmp) | |
140 | # endif | |
141 | #endif |