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d5efd131 MF |
1 | /* Optimized version of the memccpy() function. |
2 | This file is part of the GNU C Library. | |
b168057a | 3 | Copyright (C) 2000-2015 Free Software Foundation, Inc. |
d5efd131 MF |
4 | Contributed by Dan Pop <Dan.Pop@cern.ch>. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
75efb018 MF |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
d5efd131 MF |
19 | |
20 | /* Return: a pointer to the next byte after char in dest or NULL | |
21 | ||
22 | Inputs: | |
23 | in0: dest | |
24 | in1: src | |
c70a4b1d | 25 | in2: char |
d5efd131 MF |
26 | in3: byte count |
27 | ||
28 | This implementation assumes little endian mode (UM.be = 0). | |
29 | ||
30 | This implementation assumes that it is safe to do read ahead | |
31 | in the src block, without getting beyond its limit. */ | |
32 | ||
33 | #include <sysdep.h> | |
34 | #undef ret | |
35 | ||
36 | #define OP_T_THRES 16 | |
37 | #define OPSIZ 8 | |
38 | ||
39 | #define saved_pr r17 | |
40 | #define saved_lc r18 | |
41 | #define dest r19 | |
42 | #define src r20 | |
43 | #define len r21 | |
44 | #define asrc r22 | |
45 | #define tmp r23 | |
46 | #define char r24 | |
47 | #define charx8 r25 | |
48 | #define saved_ec r26 | |
49 | #define sh2 r28 | |
50 | #define sh1 r29 | |
51 | #define loopcnt r30 | |
52 | #define value r31 | |
53 | ||
54 | #ifdef GAS_ALIGN_BREAKS_UNWIND_INFO | |
55 | /* Manually force proper loop-alignment. Note: be sure to | |
56 | double-check the code-layout after making any changes to | |
57 | this routine! */ | |
58 | # define ALIGN(n) { nop 0 } | |
59 | #else | |
60 | # define ALIGN(n) .align n | |
61 | #endif | |
62 | ||
63 | ENTRY(memccpy) | |
64 | .prologue | |
65 | alloc r2 = ar.pfs, 4, 40 - 4, 0, 40 | |
66 | ||
67 | #include "softpipe.h" | |
68 | .rotr r[MEMLAT + 7], tmp1[4], tmp2[4], val[4], tmp3[2], pos0[2] | |
69 | .rotp p[MEMLAT + 6 + 1] | |
70 | ||
71 | mov ret0 = r0 // return NULL if no match | |
72 | .save pr, saved_pr | |
73 | mov saved_pr = pr // save the predicate registers | |
74 | mov dest = in0 // dest | |
75 | .save ar.lc, saved_lc | |
76 | mov saved_lc = ar.lc // save the loop counter | |
77 | mov saved_ec = ar.ec // save the loop counter | |
78 | .body | |
79 | mov src = in1 // src | |
80 | extr.u char = in2, 0, 8 // char | |
81 | mov len = in3 // len | |
82 | sub tmp = r0, in0 // tmp = -dest | |
83 | cmp.ne p7, p0 = r0, r0 // clear p7 | |
84 | ;; | |
85 | and loopcnt = 7, tmp // loopcnt = -dest % 8 | |
86 | cmp.ge p6, p0 = OP_T_THRES, len // is len <= OP_T_THRES | |
87 | mov ar.ec = 0 // ec not guaranteed zero on entry | |
88 | (p6) br.cond.spnt .cpyfew // copy byte by byte | |
89 | ;; | |
90 | cmp.eq p6, p0 = loopcnt, r0 | |
91 | mux1 charx8 = char, @brcst | |
92 | (p6) br.cond.sptk .dest_aligned | |
93 | sub len = len, loopcnt // len -= -dest % 8 | |
94 | adds loopcnt = -1, loopcnt // --loopcnt | |
95 | ;; | |
96 | mov ar.lc = loopcnt | |
97 | .l1: // copy -dest % 8 bytes | |
98 | ld1 value = [src], 1 // value = *src++ | |
99 | ;; | |
100 | st1 [dest] = value, 1 // *dest++ = value | |
101 | cmp.eq p6, p0 = value, char | |
102 | (p6) br.cond.spnt .foundit | |
103 | br.cloop.dptk .l1 | |
104 | .dest_aligned: | |
105 | and sh1 = 7, src // sh1 = src % 8 | |
106 | and tmp = -8, len // tmp = len & -OPSIZ | |
107 | and asrc = -8, src // asrc = src & -OPSIZ -- align src | |
108 | shr.u loopcnt = len, 3 // loopcnt = len / 8 | |
109 | and len = 7, len ;; // len = len % 8 | |
110 | shl sh1 = sh1, 3 // sh1 = 8 * (src % 8) | |
111 | adds loopcnt = -1, loopcnt // --loopcnt | |
112 | mov pr.rot = 1 << 16 ;; // set rotating predicates | |
113 | sub sh2 = 64, sh1 // sh2 = 64 - sh1 | |
114 | mov ar.lc = loopcnt // set LC | |
115 | cmp.eq p6, p0 = sh1, r0 // is the src aligned? | |
116 | (p6) br.cond.sptk .src_aligned ;; | |
117 | add src = src, tmp // src += len & -OPSIZ | |
118 | mov ar.ec = MEMLAT + 6 + 1 // six more passes needed | |
119 | ld8 r[1] = [asrc], 8 // r[1] = w0 | |
120 | cmp.ne p6, p0 = r0, r0 ;; // clear p6 | |
121 | ALIGN(32) | |
122 | .l2: | |
123 | (p[0]) ld8.s r[0] = [asrc], 8 // r[0] = w1 | |
124 | (p[MEMLAT]) shr.u tmp1[0] = r[1 + MEMLAT], sh1 // tmp1 = w0 >> sh1 | |
125 | (p[MEMLAT]) shl tmp2[0] = r[0 + MEMLAT], sh2 // tmp2 = w1 << sh2 | |
126 | (p[MEMLAT+4]) xor tmp3[0] = val[1], charx8 | |
127 | (p[MEMLAT+5]) czx1.r pos0[0] = tmp3[1] | |
128 | (p[MEMLAT+6]) chk.s r[6 + MEMLAT], .recovery1 // our data isn't | |
129 | // valid - rollback! | |
130 | (p[MEMLAT+6]) cmp.ne p6, p0 = 8, pos0[1] | |
131 | (p6) br.cond.spnt .gotit | |
132 | (p[MEMLAT+6]) st8 [dest] = val[3], 8 // store val to dest | |
133 | (p[MEMLAT+3]) or val[0] = tmp1[3], tmp2[3] // val = tmp1 | tmp2 | |
134 | br.ctop.sptk .l2 | |
135 | br.cond.sptk .cpyfew | |
136 | ||
137 | .src_aligned: | |
138 | cmp.ne p6, p0 = r0, r0 // clear p6 | |
139 | mov ar.ec = MEMLAT + 2 + 1 ;; // set EC | |
140 | .l3: | |
141 | (p[0]) ld8.s r[0] = [src], 8 | |
142 | (p[MEMLAT]) xor tmp3[0] = r[MEMLAT], charx8 | |
143 | (p[MEMLAT+1]) czx1.r pos0[0] = tmp3[1] | |
144 | (p[MEMLAT+2]) cmp.ne p7, p0 = 8, pos0[1] | |
145 | (p[MEMLAT+2]) chk.s r[MEMLAT+2], .recovery2 | |
146 | (p7) br.cond.spnt .gotit | |
147 | .back2: | |
148 | (p[MEMLAT+2]) st8 [dest] = r[MEMLAT+2], 8 | |
149 | br.ctop.dptk .l3 | |
150 | .cpyfew: | |
151 | cmp.eq p6, p0 = len, r0 // is len == 0 ? | |
152 | adds len = -1, len // --len; | |
153 | (p6) br.cond.spnt .restore_and_exit ;; | |
154 | mov ar.lc = len | |
155 | .l4: | |
156 | ld1 value = [src], 1 | |
157 | ;; | |
158 | st1 [dest] = value, 1 | |
159 | cmp.eq p6, p0 = value, char | |
160 | (p6) br.cond.spnt .foundit | |
161 | br.cloop.dptk .l4 ;; | |
162 | .foundit: | |
163 | (p6) mov ret0 = dest | |
164 | .restore_and_exit: | |
165 | mov pr = saved_pr, -1 // restore the predicate registers | |
166 | mov ar.lc = saved_lc // restore the loop counter | |
167 | mov ar.ec = saved_ec ;; // restore the epilog counter | |
168 | br.ret.sptk.many b0 | |
169 | .gotit: | |
170 | .pred.rel "mutex" p6, p7 | |
171 | (p6) mov value = val[3] // if coming from l2 | |
172 | (p7) mov value = r[MEMLAT+2] // if coming from l3 | |
173 | mov ar.lc = pos0[1] ;; | |
174 | .l5: | |
175 | extr.u tmp = value, 0, 8 ;; | |
176 | st1 [dest] = tmp, 1 | |
177 | shr.u value = value, 8 | |
178 | br.cloop.sptk .l5 ;; | |
179 | mov ret0 = dest | |
180 | mov pr = saved_pr, -1 | |
181 | mov ar.lc = saved_lc | |
182 | br.ret.sptk.many b0 | |
183 | ||
184 | .recovery1: | |
185 | #if MEMLAT != 6 | |
186 | # error "MEMLAT must be 6!" | |
187 | #endif | |
188 | adds src = -8, asrc | |
189 | mov loopcnt = ar.lc | |
190 | mov tmp = ar.ec | |
191 | ;; | |
192 | (p[0]) adds src = -8, src | |
193 | ;; | |
194 | (p[1]) adds src = -8, src | |
195 | sub sh1 = (MEMLAT + 6 + 1), tmp | |
196 | ;; | |
197 | (p[2]) adds src = -8, src | |
198 | ;; | |
199 | (p[3]) adds src = -8, src | |
200 | shl loopcnt = loopcnt, 3 | |
201 | ;; | |
202 | (p[4]) adds src = -8, src | |
203 | ;; | |
204 | (p[5]) adds src = -8, src | |
205 | shl sh1 = sh1, 3 | |
206 | ;; | |
207 | (p[6]) adds src = -8, src | |
208 | ;; | |
209 | (p[7]) adds src = -8, src | |
210 | shl tmp = tmp, 3 | |
211 | ;; | |
212 | (p[8]) adds src = -8, src | |
213 | ;; | |
214 | (p[9]) adds src = -8, src | |
215 | shr.u sh2 = sh2, 3 | |
216 | ;; | |
217 | (p[10]) adds src = -8, src | |
218 | ;; | |
219 | (p[11]) adds src = -8, src | |
220 | add len = len, loopcnt | |
221 | ;; | |
222 | sub src = src, sh2 | |
223 | ;; | |
224 | add len = tmp, len | |
225 | add src = sh1, src | |
226 | br.cond.sptk .cpyfew | |
227 | ||
228 | .recovery2: | |
229 | #if MEMLAT != 6 | |
230 | # error "MEMLAT must be 6!" | |
231 | #endif | |
232 | add tmp = -8, src | |
233 | (p7) br.cond.spnt .gotit | |
234 | ;; | |
235 | (p[0]) add tmp = -8, tmp ;; | |
236 | (p[1]) add tmp = -8, tmp ;; | |
237 | (p[2]) add tmp = -8, tmp ;; | |
238 | (p[3]) add tmp = -8, tmp ;; | |
239 | (p[4]) add tmp = -8, tmp ;; | |
240 | (p[5]) add tmp = -8, tmp ;; | |
241 | (p[6]) add tmp = -8, tmp ;; | |
242 | (p[7]) add tmp = -8, tmp ;; | |
243 | ld8 r[MEMLAT+2] = [tmp] ;; | |
244 | xor pos0[1] = r[MEMLAT+2], charx8 ;; | |
245 | czx1.r pos0[1] = pos0[1] ;; | |
246 | cmp.ne p7, p6 = 8, pos0[1] | |
247 | (p7) br.cond.spnt .gotit | |
248 | br.cond.sptk .back2 | |
249 | END(memccpy) |