1 /* Optimized version of the memccpy() function.
2 This file is part of the GNU C Library.
3 Copyright (C) 2000 Free Software Foundation, Inc.
4 Contributed by Dan Pop <Dan.Pop@cern.ch>.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 License, or (at your option) any later version.
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 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Return: a pointer to the next byte after char in dest or NULL
29 This implementation assumes little endian mode (UM.be = 0).
31 This implementation assumes that it is safe to do read ahead
32 in the src block, without getting beyond its limit. */
56 alloc saved_pfs = ar.pfs, 4, 40 - 4, 0, 40
59 .rotr r[MEMLAT + 3], tmp1[4], tmp2[4], val[4], tmp3[2], pos0[2]
60 .rotp p[MEMLAT + 6 + 1]
62 mov ret0 = r0 // return NULL if no match
63 mov saved_pr = pr // save the predicate registers
64 mov saved_lc = ar.lc // save the loop counter
65 mov dest = in0 // dest
67 extr.u char = in2, 0, 8 // char
69 sub tmp = r0, in0 // tmp = -dest
70 cmp.ne p7, p0 = r0, r0 // clear p7
72 and loopcnt = 7, tmp // loopcnt = -dest % 8
73 cmp.ge p6, p0 = OP_T_THRES, len // is len <= OP_T_THRES
74 (p6) br.cond.spnt .cpyfew // copy byte by byte
76 cmp.eq p6, p0 = loopcnt, r0
77 mux1 charx8 = char, @brcst
78 (p6) br.cond.sptk .dest_aligned
79 sub len = len, loopcnt // len -= -dest % 8
80 adds loopcnt = -1, loopcnt // --loopcnt
83 .l1: // copy -dest % 8 bytes
84 ld1 value = [src], 1 // value = *src++
86 st1 [dest] = value, 1 // *dest++ = value
87 cmp.eq p6, p0 = value, char
88 (p6) br.cond.spnt .foundit
91 and sh1 = 7, src // sh1 = src % 8
92 and tmp = -8, len // tmp = len & -OPSIZ
93 and asrc = -8, src // asrc = src & -OPSIZ -- align src
94 shr.u loopcnt = len, 3 // loopcnt = len / 8
95 and len = 7, len ;; // len = len % 8
96 shl sh1 = sh1, 3 // sh1 = 8 * (src % 8)
97 adds loopcnt = -1, loopcnt // --loopcnt
98 mov pr.rot = 1 << 16 ;; // set rotating predicates
99 sub sh2 = 64, sh1 // sh2 = 64 - sh1
100 mov ar.lc = loopcnt // set LC
101 cmp.eq p6, p0 = sh1, r0 // is the src aligned?
102 (p6) br.cond.sptk .src_aligned ;;
103 add src = src, tmp // src += len & -OPSIZ
104 mov ar.ec = MEMLAT + 6 + 1 // six more passes needed
105 ld8 r[1] = [asrc], 8 // r[1] = w0
106 cmp.ne p6, p0 = r0, r0 ;; // clear p6
109 (p[0]) ld8 r[0] = [asrc], 8 // r[0] = w1
110 (p[MEMLAT]) shr.u tmp1[0] = r[1 + MEMLAT], sh1 // tmp1 = w0 >> sh1
111 (p[MEMLAT]) shl tmp2[0] = r[0 + MEMLAT], sh2 // tmp2 = w1 << sh2
112 (p[MEMLAT+4]) xor tmp3[0] = val[1], charx8
113 (p[MEMLAT+5]) czx1.r pos0[0] = tmp3[1]
114 (p[MEMLAT+6]) cmp.ne p6, p0 = 8, pos0[1]
115 (p6) br.cond.spnt .gotit
116 (p[MEMLAT+6]) st8 [dest] = val[3], 8 // store val to dest
117 (p[MEMLAT+3]) or val[0] = tmp1[3], tmp2[3] // val = tmp1 | tmp2
121 cmp.ne p6, p0 = r0, r0 // clear p6
122 mov ar.ec = MEMLAT + 2 + 1 ;; // set EC
124 (p[0]) ld8 r[0] = [src], 8
125 (p[MEMLAT]) xor tmp3[0] = r[MEMLAT], charx8
126 (p[MEMLAT+1]) czx1.r pos0[0] = tmp3[1]
127 (p[MEMLAT+2]) cmp.ne p7, p0 = 8, pos0[1]
128 (p7) br.cond.spnt .gotit
129 (p[MEMLAT+2]) st8 [dest] = r[MEMLAT+2], 8
132 cmp.eq p6, p0 = len, r0 // is len == 0 ?
133 adds len = -1, len // --len;
134 (p6) br.cond.spnt .restore_and_exit ;;
139 st1 [dest] = value, 1
140 cmp.eq p6, p0 = value, char
141 (p6) br.cond.spnt .foundit
146 mov ar.pfs = saved_pfs // restore the PFS
147 mov pr = saved_pr, -1 // restore the predicate registers
148 mov ar.lc = saved_lc // restore the loop counter
151 .pred.rel "mutex" p6, p7
152 (p6) mov value = val[3] // if coming from l2
153 (p7) mov value = r[MEMLAT+2] // if coming from l3
154 mov ar.lc = pos0[1] ;;
156 extr.u tmp = value, 0, 8 ;;
158 shr.u value = value, 8
161 mov ar.pfs = saved_pfs
162 mov pr = saved_pr, -1