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63724a6d | 1 | /* Vector optimized 32/64 bit S/390 version of strcmp. |
2b778ceb | 2 | Copyright (C) 2015-2021 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 | |
cdab85fe SL |
19 | #include <ifunc-strcmp.h> |
20 | #if HAVE_STRCMP_Z13 | |
63724a6d SL |
21 | |
22 | # include "sysdep.h" | |
23 | # include "asm-syntax.h" | |
24 | ||
25 | .text | |
26 | ||
27 | /* int strcmp (const char *s1, const char *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 | */ | |
cdab85fe | 40 | ENTRY(STRCMP_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 | vfenezbs %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 | vfenezbs %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 | vfenezbs %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 | vfenezbs %v18,%v16,%v17 | |
86 | jno .Lfound | |
87 | j .Lloop | |
88 | ||
89 | .Llt16_1: | |
90 | lcbb %r4,0(%r5,%r3),6 /* Get loaded byte count of s2. */ | |
91 | .Llt16_2: | |
92 | clr %r1,%r4 | |
93 | locrh %r1,%r4 /* Get minimum of bytes loaded in s1/2. */ | |
94 | algfr %r5,%r1 /* Add smallest loaded bytes to current_len. */ | |
95 | vfenezbs %v18,%v16,%v17 /* Compare not equal with zero search. */ | |
96 | vlgvb %r4,%v18,7 /* Get not equal index or 16 if all equal. */ | |
97 | clrjl %r4,%r1,.Lfound /* Jump away if miscompare is within loaded | |
98 | bytes. */ | |
99 | j .Lloop | |
100 | ||
101 | .Lfound: | |
102 | je .Lend_equal | |
103 | lghi %r2,1 | |
104 | lghi %r1,-1 | |
105 | locgrl %r2,%r1 | |
106 | br %r14 | |
107 | .Lend_equal: | |
108 | lghi %r2,0 | |
109 | br %r14 | |
cdab85fe | 110 | END(STRCMP_Z13) |
63724a6d | 111 | |
cdab85fe SL |
112 | # if ! HAVE_STRCMP_IFUNC |
113 | strong_alias (STRCMP_Z13, strcmp) | |
114 | # endif | |
63724a6d | 115 | |
cdab85fe SL |
116 | # if ! HAVE_STRCMP_Z900_G5 && defined SHARED && IS_IN (libc) |
117 | strong_alias (STRCMP_Z13, __GI_strcmp) | |
118 | # endif | |
119 | #endif |