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e1fe9118 | 1 | /* Vector optimized 32/64 bit S/390 version of wcsncat. |
d614a753 | 2 | Copyright (C) 2015-2020 Free Software Foundation, Inc. |
e1fe9118 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/>. */ |
e1fe9118 | 18 | |
814a76e1 SL |
19 | #include <ifunc-wcsncat.h> |
20 | #if HAVE_WCSNCAT_Z13 | |
e1fe9118 SL |
21 | |
22 | # include "sysdep.h" | |
23 | # include "asm-syntax.h" | |
24 | ||
25 | .text | |
26 | ||
27 | /* wchar_t * wcsncat (wchar_t *dest, const wchar_t *src, size_t n) | |
28 | Concatenate two strings - at most n characters of src. | |
29 | ||
30 | Register usage: | |
31 | -r0=saved dest pointer for return | |
32 | -r1=tmp | |
33 | -r2=dest | |
34 | -r3=src | |
35 | -r4=n | |
36 | -r5=current_len | |
37 | -r6=tmp | |
38 | -r7=tmp | |
39 | -v16=part of src | |
40 | -v17=index of zero | |
41 | -v18=part of src | |
42 | -v31=register save area for r6, r7 | |
43 | */ | |
814a76e1 | 44 | ENTRY(WCSNCAT_Z13) |
e1fe9118 SL |
45 | .machine "z13" |
46 | .machinemode "zarch_nohighgprs" | |
47 | ||
48 | # if !defined __s390x__ | |
49 | llgfr %r4,%r4 | |
50 | # endif /* !defined __s390x__ */ | |
51 | ||
52 | clgfi %r4,0 | |
53 | ber %r14 /* Nothing to do, if n == 0. */ | |
54 | ||
55 | vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ | |
56 | lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ | |
57 | ||
58 | /* If either src or dest is not 4byte aligned, use __wcsncat_c. */ | |
59 | tmll %r2,3 /* Test if s is 4-byte aligned? */ | |
60 | jne .Lfallback /* And use common-code variant if not. */ | |
61 | tmll %r3,3 /* Test if src is 4-byte aligned? */ | |
62 | jne .Lfallback /* And use common-code variant if not. */ | |
63 | ||
64 | lgr %r0,%r2 /* Save destination pointer for return. */ | |
65 | vlvgp %v31,%r6,%r7 /* Save registers. */ | |
66 | ||
67 | /* WCSLEN | |
68 | %r1 = loaded bytes (tmp) | |
69 | %r6 = zero byte index (tmp) | |
70 | %r2 = dst | |
71 | */ | |
72 | vfenezf %v16,%v16,%v16 /* Find element not equal with zero search. */ | |
73 | vlgvb %r5,%v16,7 /* Load zero index or 16 if not found. */ | |
74 | clrjl %r5,%r1,.Llen_end /* Found zero within loaded bytes, end. */ | |
75 | ||
76 | /* Align s to 16 byte. */ | |
77 | risbgn %r1,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ | |
78 | lghi %r5,16 /* current_len = 16. */ | |
79 | slr %r5,%r1 /* Compute bytes to 16bytes boundary. */ | |
80 | ||
81 | /* Find zero in 16byte aligned loop. */ | |
82 | .Llen_loop: | |
83 | vl %v16,0(%r5,%r2) /* Load s. */ | |
84 | vfenezfs %v16,%v16,%v16 /* Find element not equal with zero search. */ | |
85 | je .Llen_found /* Jump away if zero was found. */ | |
86 | vl %v16,16(%r5,%r2) | |
87 | vfenezfs %v16,%v16,%v16 | |
88 | je .Llen_found16 | |
89 | vl %v16,32(%r5,%r2) | |
90 | vfenezfs %v16,%v16,%v16 | |
91 | je .Llen_found32 | |
92 | vl %v16,48(%r5,%r2) | |
93 | vfenezfs %v16,%v16,%v16 | |
94 | je .Llen_found48 | |
95 | ||
96 | aghi %r5,64 | |
97 | j .Llen_loop /* No zero -> loop. */ | |
98 | ||
99 | .Llen_found48: | |
100 | aghi %r5,16 | |
101 | .Llen_found32: | |
102 | aghi %r5,16 | |
103 | .Llen_found16: | |
104 | aghi %r5,16 | |
105 | .Llen_found: | |
106 | vlgvb %r1,%v16,7 /* Load byte index of zero. */ | |
107 | algr %r5,%r1 | |
108 | ||
109 | .Llen_end: | |
110 | /* WCSNCPY | |
111 | %r1 = zero byte index (tmp) | |
112 | %r6 = loaded bytes (tmp) | |
113 | %r3 = curr src pointer | |
114 | %r2 = curr dst pointer | |
115 | %r7 = border, tmp | |
116 | */ | |
117 | la %r2,0(%r5,%r2) /* strcpy at end of dst-string. */ | |
118 | ||
119 | vlbb %v16,0(%r3),6 /* Load s until next 4k-byte boundary. */ | |
120 | lcbb %r6,0(%r3),6 /* Get bytes to 4k-byte boundary or 16. */ | |
121 | llgfr %r6,%r6 /* Convert 32bit to 64bit. */ | |
122 | ||
123 | lghi %r5,0 /* current_len = 0. */ | |
124 | ||
125 | /* Check range of maxlen and convert to byte-count. */ | |
126 | # ifdef __s390x__ | |
127 | tmhh %r4,49152 /* Test bit 0 or 1 of maxlen. */ | |
128 | lghi %r1,-4 /* Max byte-count is 18446744073709551612. */ | |
129 | # else | |
130 | tmlh %r4,49152 /* Test bit 0 or 1 of maxlen. */ | |
131 | llilf %r1,4294967292 /* Max byte-count is 4294967292. */ | |
132 | # endif /* !__s390x__ */ | |
133 | sllg %r4,%r4,2 /* Convert character-count to byte-count. */ | |
134 | locgrne %r4,%r1 /* Use max byte-count, if bit 0/1 was one. */ | |
135 | ||
136 | clgrjle %r4,%r6,.Lcpy_remaining_v16 /* If n <= loaded-bytes | |
137 | -> process remaining. */ | |
138 | ||
139 | /* n > loaded-byte-count. */ | |
140 | vfenezf %v17,%v16,%v16 /* Find element not equal with zero search. */ | |
141 | vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */ | |
142 | clrjl %r1,%r6,.Lcpy_found_v16_store /* Found zero within loaded bytes, | |
143 | copy and return. */ | |
144 | ||
145 | /* Align s to 16 byte. */ | |
146 | risbgn %r1,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ | |
147 | lghi %r5,15 /* current_len = 15. */ | |
148 | slr %r5,%r1 /* Compute highest index to 16byte boundary. * | |
149 | ||
150 | /* Zero not found and maxlen > loaded-byte-count. */ | |
151 | vstl %v16,%r5,0(%r2) /* Copy loaded characters - no zero. */ | |
152 | ahi %r5,1 /* Start loop at next character. */ | |
153 | ||
154 | /* | |
155 | Now we are 16byte aligned, so we can load a full vreg | |
156 | without page fault. | |
157 | */ | |
158 | lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */ | |
159 | aghi %r1,64 | |
160 | clgrjl %r1,%r4,.Lcpy_loop64 | |
161 | ||
162 | vl %v16,0(%r5,%r3) /* Load s. */ | |
163 | clgijl %r4,17,.Lcpy_remaining_v16 /* If n <=16, | |
164 | process remaining bytes. */ | |
165 | .Lcpy_lt64: | |
166 | lgr %r7,%r4 | |
167 | slgfi %r7,16 /* border_len = n - 16. */ | |
168 | ||
169 | clgrjhe %r5,%r7,.Lcpy_remaining_v16 | |
170 | vfenezfs %v17,%v16,%v16 /* Find element not equal with zero search. */ | |
171 | je .Lcpy_found_v16 /* Jump away if zero was found. */ | |
172 | vl %v18,16(%r5,%r3) /* Load next part of s. */ | |
173 | vst %v16,0(%r5,%r2) /* Save previous part without zero to dst. */ | |
174 | aghi %r5,16 | |
175 | ||
176 | clgrjhe %r5,%r7,.Lcpy_remaining_v18 | |
177 | vfenezfs %v17,%v18,%v18 | |
178 | je .Lcpy_found_v18 | |
179 | vl %v16,16(%r5,%r3) | |
180 | vst %v18,0(%r5,%r2) | |
181 | aghi %r5,16 | |
182 | ||
183 | clgrjhe %r5,%r7,.Lcpy_remaining_v16 | |
184 | vfenezfs %v17,%v16,%v16 | |
185 | je .Lcpy_found_v16 | |
186 | vl %v18,16(%r5,%r3) | |
187 | vst %v16,0(%r5,%r2) | |
188 | aghi %r5,16 | |
189 | ||
190 | .Lcpy_remaining_v18: | |
191 | vlr %v16,%v18 | |
192 | .Lcpy_remaining_v16: | |
193 | /* v16 contains the remaining bytes [1...16]. | |
194 | Store remaining bytes and append string-termination. */ | |
195 | vfenezf %v17,%v16,%v16 /* Find element not equal with zero search. */ | |
196 | slgrk %r7,%r4,%r5 /* Remaining bytes = maxlen - current_len. */ | |
197 | aghi %r7,-1 /* vstl needs highest index. */ | |
198 | vlgvb %r1,%v17,7 /* Load zero index or 16 if not found. */ | |
199 | la %r2,0(%r5,%r2) /* vstl has no index register. */ | |
200 | /* Zero-index within remaining-bytes, store up to zero and end. */ | |
201 | clgrjle %r1,%r7,.Lcpy_found_v16_store | |
202 | vstl %v16,%r7,0(%r2) /* Store remaining bytes. */ | |
203 | lghi %r1,0 | |
204 | st %r1,1(%r7,%r2) /* Store string-null-termination beyond n. */ | |
205 | .Lcpy_end: | |
206 | /* Restore saved registers. */ | |
207 | vlgvg %r6,%v31,0 | |
208 | vlgvg %r7,%v31,1 | |
209 | lgr %r2,%r0 /* Load saved dest-ptr. */ | |
210 | br %r14 | |
211 | ||
212 | .Lcpy_found_v16_32: | |
213 | aghi %r5,32 | |
214 | j .Lcpy_found_v16 | |
215 | .Lcpy_found_v18_48: | |
216 | aghi %r5,32 | |
217 | .Lcpy_found_v18_16: | |
218 | aghi %r5,16 | |
219 | .Lcpy_found_v18: | |
220 | vlr %v16,%v18 | |
221 | .Lcpy_found_v16: | |
222 | /* v16 contains a zero. Store remaining bytes to zero. current_len | |
223 | has not reached border, thus checking for n is not needed! */ | |
224 | vlgvb %r1,%v17,7 /* Load byte index of zero. */ | |
225 | la %r2,0(%r5,%r2) | |
226 | .Lcpy_found_v16_store: | |
227 | aghi %r1,3 /* Also copy remaining bytes of zero. */ | |
228 | vstl %v16,%r1,0(%r2) /* Copy characters including zero. */ | |
229 | j .Lcpy_end | |
230 | ||
231 | /* Find zero in 16byte aligned loop. */ | |
232 | .Lcpy_loop2: | |
233 | vl %v16,16(%r5,%r3) | |
234 | vst %v18,0(%r5,%r2) | |
235 | aghi %r5,16 | |
236 | ||
237 | .Lcpy_loop64: | |
238 | vl %v16,0(%r5,%r3) | |
239 | vfenezfs %v17,%v16,%v16 /* Find element not equal with zero search. */ | |
240 | je .Lcpy_found_v16 /* Jump away if zero was found. */ | |
241 | vl %v18,16(%r5,%r3) /* Load next part of s. */ | |
242 | vst %v16,0(%r5,%r2) /* Save previous part without zero to dst. */ | |
243 | vfenezfs %v17,%v18,%v18 | |
244 | je .Lcpy_found_v18_16 | |
245 | vl %v16,32(%r5,%r3) | |
246 | vst %v18,16(%r5,%r2) | |
247 | vfenezfs %v17,%v16,%v16 | |
248 | je .Lcpy_found_v16_32 | |
249 | vl %v18,48(%r5,%r3) | |
250 | vst %v16,32(%r5,%r2) | |
251 | vfenezfs %v17,%v18,%v18 | |
252 | je .Lcpy_found_v18_48 | |
253 | vst %v18,48(%r5,%r2) | |
254 | ||
255 | aghi %r5,64 | |
256 | lgr %r1,%r5 /* If %r5 + 64 < maxlen? -> loop64. */ | |
257 | aghi %r1,64 | |
258 | clgrjl %r1,%r4,.Lcpy_loop64 | |
259 | ||
260 | vl %v16,0(%r5,%r3) /* Load s. */ | |
261 | j .Lcpy_lt64 | |
262 | ||
263 | .Lfallback: | |
814a76e1 SL |
264 | jg WCSNCAT_C |
265 | END(WCSNCAT_Z13) | |
266 | ||
267 | # if ! HAVE_WCSNCAT_IFUNC | |
268 | strong_alias (WCSNCAT_Z13, wcsncat) | |
269 | # endif | |
270 | #endif |