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f1ffad98 | 1 | /* Vector optimized 32/64 bit S/390 version of strspn. |
04277e02 | 2 | Copyright (C) 2015-2019 Free Software Foundation, Inc. |
f1ffad98 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/>. */ |
f1ffad98 | 18 | |
483fc569 SL |
19 | #include <ifunc-strspn.h> |
20 | ||
21 | #if HAVE_STRSPN_Z13 | |
f1ffad98 SL |
22 | |
23 | # include "sysdep.h" | |
24 | # include "asm-syntax.h" | |
25 | ||
26 | .text | |
27 | ||
28 | /* size_t strspn (const char *s, const char * accept) | |
29 | The strspn() function calculates the length of the initial segment | |
30 | of s which consists entirely of characters in accept. | |
31 | ||
32 | This method checks the length of accept string. If it fits entirely | |
33 | in one vector register, a fast algorithm is used, which does not need | |
34 | to check multiple parts of accept-string. Otherwise a slower full | |
35 | check of accept-string is used. | |
36 | ||
37 | register overview: | |
38 | r3: pointer to start of accept-string | |
39 | r2: pointer to start of search-string | |
40 | r4: loaded byte count of vl search-string | |
41 | r0: found byte index | |
42 | r1: current return len of s | |
43 | v16: search-string | |
44 | v17: accept-string | |
45 | v18: temp-vreg | |
46 | ||
47 | ONLY FOR SLOW: | |
48 | v19: first accept-string | |
49 | v20: zero for preparing acc-vector | |
50 | v21: global mask; 1 indicates a match between | |
51 | search-string-vreg and any accept-character | |
52 | v22: current mask; 1 indicates a match between | |
53 | search-string-vreg and any accept-character in current acc-vreg | |
54 | v30, v31: for re-/storing registers r6, r8, r9 | |
55 | r5: current len of accept-string | |
56 | r6: zero-index in search-string or 16 if no zero | |
57 | or min(zero-index, loaded byte count) | |
58 | r8: >0, if former accept-string-part contains a zero, | |
59 | otherwise =0; | |
60 | r9: loaded byte count of vlbb accept-string | |
61 | */ | |
483fc569 | 62 | ENTRY(STRSPN_Z13) |
f1ffad98 SL |
63 | .machine "z13" |
64 | .machinemode "zarch_nohighgprs" | |
65 | ||
66 | /* | |
67 | Check if accept-string fits in one vreg: | |
68 | ---------------------------------------- | |
69 | */ | |
70 | vlbb %v17,0(%r3),6 /* Load accept. */ | |
71 | lcbb %r4,0(%r3),6 | |
72 | jo .Lcheck_onbb /* Special case if accept lays | |
73 | on block-boundary. */ | |
74 | .Lcheck_notonbb: | |
75 | vistrbs %v17,%v17 /* Fill with zeros after first zero. */ | |
76 | je .Lfast /* Zero found -> accept fits in one vreg. */ | |
77 | j .Lslow /* No zero -> accept exceeds one vreg. */ | |
78 | ||
79 | .Lcheck_onbb: | |
80 | /* Accept lays on block-boundary. */ | |
81 | vfenezb %v18,%v17,%v17 /* Search zero in loaded accept bytes. */ | |
82 | vlgvb %r0,%v18,7 /* Get index of zero or 16 if not found. */ | |
83 | clrjl %r0,%r4,.Lcheck_notonbb /* Zero index < loaded bytes count -> | |
84 | Accept fits in one vreg; | |
85 | Fill with zeros and proceed | |
86 | with FAST. */ | |
87 | vl %v17,0(%r3) /* Load accept, which exceeds loaded bytes. */ | |
88 | j .Lcheck_notonbb /* Check if accept fits in one vreg. */ | |
89 | ||
90 | ||
91 | /* | |
92 | Search s for accept in one vreg | |
93 | ------------------------------- | |
94 | */ | |
95 | .Lfast: | |
96 | /* Complete accept-string is in v17 and remaining bytes are zero. */ | |
97 | ||
98 | vlbb %v16,0(%r2),6 /* Load s until next 4k-byte boundary. */ | |
99 | lcbb %r1,0(%r2),6 /* Get bytes to 4k-byte boundary or 16. */ | |
100 | ||
101 | vfaezbs %v16,%v16,%v17,8 /* Find first element in v16 | |
102 | unequal to any in v17 | |
103 | or first zero element. */ | |
104 | vlgvb %r0,%v16,7 /* Load byte index of found element. */ | |
105 | /* If found index is within loaded bytes (%r0 < %r1), | |
106 | return with found element index (=equal count). */ | |
107 | clr %r0,%r1 | |
108 | locgrl %r2,%r0 | |
109 | blr %r14 | |
110 | ||
111 | /* Align s to 16 byte. */ | |
112 | risbgn %r4,%r2,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15. */ | |
113 | lghi %r1,16 /* current_len = 16. */ | |
114 | slr %r1,%r4 /* Compute bytes to 16bytes boundary. */ | |
115 | ||
116 | .Lfast_loop: | |
117 | vl %v16,0(%r1,%r2) /* Load search-string. */ | |
118 | vfaezbs %v16,%v16,%v17,8 /* Find first element in v16 | |
119 | unequal to any in v17 | |
120 | or first zero element. */ | |
121 | jno .Lfast_loop_found | |
122 | vl %v16,16(%r1,%r2) | |
123 | vfaezbs %v16,%v16,%v17,8 | |
124 | jno .Lfast_loop_found16 | |
125 | vl %v16,32(%r1,%r2) | |
126 | vfaezbs %v16,%v16,%v17,8 | |
127 | jno .Lfast_loop_found32 | |
128 | vl %v16,48(%r1,%r2) | |
129 | vfaezbs %v16,%v16,%v17,8 | |
130 | jno .Lfast_loop_found48 | |
131 | ||
132 | aghi %r1,64 | |
133 | j .Lfast_loop /* Loop if no element was unequal to accept | |
134 | and not zero. */ | |
135 | ||
136 | /* Found unequal or zero element. */ | |
137 | .Lfast_loop_found48: | |
138 | aghi %r1,16 | |
139 | .Lfast_loop_found32: | |
140 | aghi %r1,16 | |
141 | .Lfast_loop_found16: | |
142 | aghi %r1,16 | |
143 | .Lfast_loop_found: | |
144 | vlgvb %r0,%v16,7 /* Load byte index of found element. */ | |
145 | algrk %r2,%r1,%r0 /* And add it to current len. */ | |
146 | br %r14 | |
147 | ||
148 | ||
149 | /* | |
150 | Search s for accept in multiple vregs | |
151 | ------------------------------------- | |
152 | */ | |
153 | .Lslow: | |
154 | /* Save registers. */ | |
155 | vlvgg %v30,%r6,0 | |
156 | vlvgp %v31,%r8,%r9 | |
157 | lghi %r1,0 /* current_len = 0. */ | |
158 | ||
159 | /* Accept in v17 without zero. */ | |
160 | vlr %v19,%v17 /* Save first acc-part for a fast reload. */ | |
161 | vzero %v20 /* Zero for preparing acc-vector. */ | |
162 | ||
163 | /* Align s to 16 byte. */ | |
164 | risbg %r0,%r2,60,128+63,0 /* Test if s is aligned and | |
165 | %r0 = bits 60-63 'and' 15 */ | |
166 | je .Lslow_loop_str /* If s is aligned, loop aligned */ | |
167 | lghi %r4,15 | |
168 | slr %r4,%r0 /* Compute highest index to load (15-x). */ | |
169 | vll %v16,%r4,0(%r2) /* Load up to 16byte boundary (vll needs | |
170 | highest index, left bytes are 0). */ | |
171 | ahi %r4,1 /* Work with loaded byte count. */ | |
172 | vzero %v21 /* Zero out global mask. */ | |
173 | lghi %r5,0 /* Set current len of accept-string to zero. */ | |
174 | vfenezb %v18,%v16,%v16 /* Find zero in current string-part. */ | |
175 | lghi %r8,0 /* There is no zero in first accept-part. */ | |
176 | vlgvb %r6,%v18,7 /* Load byte index of zero or 16 | |
177 | if there is no zero. */ | |
178 | clr %r4,%r6 /* cc==1 if loaded byte count < zero-index. */ | |
179 | locrl %r6,%r4 /* Load on cc==1. */ | |
180 | j .Lslow_loop_acc | |
181 | ||
182 | /* Process s in 16byte aligned loop. */ | |
183 | .Lslow_next_str: | |
184 | vlr %v17,%v19 /* Load first part of accept (no zero). */ | |
185 | algfr %r1,%r4 /* Add loaded byte count to current len. */ | |
186 | .Lslow_loop_str: | |
187 | vl %v16,0(%r1,%r2) /* Load search-string. */ | |
188 | lghi %r4,16 /* Loaded byte count is 16. */ | |
189 | vzero %v21 /* Zero out global mask. */ | |
190 | lghi %r5,0 /* Set current len of accept-string to zero. */ | |
191 | vfenezb %v18,%v16,%v16 /* Find zero in current string-part. */ | |
192 | lghi %r8,0 /* There is no zero in first accept-part. */ | |
193 | vlgvb %r6,%v18,7 /* Load byte index of zero or 16 if no zero. */ | |
194 | ||
195 | .Lslow_loop_acc: | |
196 | vfaeb %v22,%v16,%v17,4 /* Create matching-mask (1 in mask -> | |
197 | character matches any accepted character in | |
198 | this accept-string-part) IN=0, RT=1. */ | |
199 | vo %v21,%v21,%v22 /* global-mask = global- | matching-mask. */ | |
200 | vfenezb %v18,%v21,%v21 /* Find first zero in global-mask. */ | |
201 | vlgvb %r0,%v18,7 /* Get first found zero-index | |
202 | (= first mismatch). */ | |
203 | clrjl %r0,%r6,.Lslow_next_acc /* Mismatch-index < min(lbc,zero-index) | |
204 | -> Process this string-part | |
205 | with next acc-part. */ | |
206 | clrjhe %r0,%r4,.Lslow_next_str /* Found-index >= loaded byte count | |
207 | -> All loaded bytes are matching | |
208 | any accept-character | |
209 | and are not zero. */ | |
210 | /* All bytes are matching any characters in accept-string | |
211 | and search-string is fully processed (found-index == zero-index) */ | |
212 | .Lslow_add_lbc_end: | |
213 | algrk %r2,%r1,%r0 /* Add matching characters to current_len. */ | |
214 | /* Restore registers. */ | |
215 | vlgvg %r6,%v30,0 | |
216 | vlgvg %r8,%v31,0 | |
217 | vlgvg %r9,%v31,1 | |
218 | br %r14 | |
219 | ||
220 | ||
221 | ||
222 | .Lslow_next_acc: | |
223 | clijh %r8,0,.Lslow_add_lbc_end /* There was a zero in last acc-part | |
224 | -> Add found index to current len | |
225 | and end. */ | |
226 | vlbb %v17,16(%r5,%r3),6 /* Load next accept part. */ | |
227 | aghi %r5,16 /* Add current_len of accept-string. */ | |
228 | lcbb %r9,0(%r5,%r3),6 /* Get loaded byte count of accept-string. */ | |
229 | jo .Lslow_next_acc_onbb /* Jump away if accept-string is | |
230 | on block-boundary. */ | |
231 | .Lslow_next_acc_notonbb: | |
232 | vistrbs %v17,%v17 /* Fill with zeros after first zero. */ | |
233 | jo .Lslow_loop_acc /* No zero found -> no preparation needed. */ | |
234 | ||
235 | .Lslow_next_acc_prepare_zero: | |
236 | /* Zero in accept-part: fill zeros with first-accept-character. */ | |
237 | vlgvb %r8,%v17,0 /* Load first element of acc-part. */ | |
238 | clije %r8,0,.Lslow_add_lbc_end /* End if zero is first character | |
239 | in this part of accept-string. */ | |
240 | /* r8>0 -> zero found in this acc-part. */ | |
241 | vrepb %v18,%v17,0 /* Replicate first char accross all chars. */ | |
242 | vceqb %v22,%v20,%v17 /* Create a mask (v22) of null chars | |
243 | by comparing with 0 (v20). */ | |
244 | vsel %v17,%v18,%v17,%v22 /* Replace null chars with first char. */ | |
245 | j .Lslow_loop_acc /* Accept part is prepared -> process. */ | |
246 | ||
247 | .Lslow_next_acc_onbb: | |
248 | vfenezb %v18,%v17,%v17 /* Find zero in loaded bytes of accept part. */ | |
249 | vlgvb %r8,%v18,7 /* Load byte index of zero. */ | |
250 | clrjl %r8,%r9,.Lslow_next_acc_notonbb /* Found a zero in loaded bytes | |
251 | -> Prepare vr. */ | |
252 | vl %v17,0(%r5,%r3) /* Load over boundary ... */ | |
253 | lghi %r8,0 /* r8=0 -> no zero in this part of acc, | |
254 | Check for zero is in jump-target. */ | |
255 | j .Lslow_next_acc_notonbb /* ... and search for zero in | |
256 | fully loaded vreg again. */ | |
483fc569 SL |
257 | END(STRSPN_Z13) |
258 | ||
259 | # if ! HAVE_STRSPN_IFUNC | |
260 | strong_alias (STRSPN_Z13, strspn) | |
261 | # endif | |
262 | ||
263 | # if ! HAVE_STRSPN_C && defined SHARED && IS_IN (libc) | |
264 | strong_alias (STRSPN_Z13, __GI_strspn) | |
265 | # endif | |
266 | ||
267 | #endif /* HAVE_STRSPN_Z13 */ |