Warning: That file was not part of the compilation database. It may have many parsing errors.

1/* Copyright (C) 2000-2019 Free Software Foundation, Inc.
2 Contributed by Richard Henderson <rth@tamu.edu>, 1996.
3 EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>.
4 This file is part of the GNU C Library.
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
17 License along with the GNU C Library. If not, see
18 <http://www.gnu.org/licenses/>. */
19
20/* Return the address of a given character within a null-terminated
21 string, or null if it is not found. */
22
23#include <sysdep.h>
24
25 .arch ev6
26 .set noreorder
27 .set noat
28
29ENTRY(strchr)
30#ifdef PROF
31 ldgp gp, 0(pv)
32 lda AT, _mcount
33 jsr AT, (AT), _mcount
34 .prologue 1
35#else
36 .prologue 0
37#endif
38
39 ldq_u t0, 0(a0) # L : load first quadword Latency=3
40 and a1, 0xff, t3 # E : 00000000000000ch
41 insbl a1, 1, t5 # U : 000000000000ch00
42 insbl a1, 7, a2 # U : ch00000000000000
43
44 insbl t3, 6, a3 # U : 00ch000000000000
45 or t5, t3, a1 # E : 000000000000chch
46 andnot a0, 7, v0 # E : align our loop pointer
47 lda t4, -1 # E : build garbage mask
48
49 mskqh t4, a0, t4 # U : only want relevant part of first quad
50 or a2, a3, a2 # E : chch000000000000
51 inswl a1, 2, t5 # E : 00000000chch0000
52 inswl a1, 4, a3 # E : 0000chch00000000
53
54 or a1, a2, a1 # E : chch00000000chch
55 or a3, t5, t5 # E : 0000chchchch0000
56 cmpbge zero, t0, t2 # E : bits set iff byte == zero
57 cmpbge zero, t4, t4 # E : bits set iff byte is garbage
58
59 /* This quad is _very_ serialized. Lots of stalling happens */
60 or t5, a1, a1 # E : chchchchchchchch
61 xor t0, a1, t1 # E : make bytes == c zero
62 cmpbge zero, t1, t3 # E : bits set iff byte == c
63 or t2, t3, t0 # E : bits set iff char match or zero match
64
65 andnot t0, t4, t0 # E : clear garbage bits
66 cttz t0, a2 # U0 : speculative (in case we get a match)
67 nop # E :
68 bne t0, $found # U :
69
70 /*
71 * Yuk. This loop is going to stall like crazy waiting for the
72 * data to be loaded. Not much can be done about it unless it's
73 * unrolled multiple times, which is generally unsafe.
74 */
75$loop:
76 ldq t0, 8(v0) # L : Latency=3
77 addq v0, 8, v0 # E :
78 xor t0, a1, t1 # E :
79 cmpbge zero, t0, t2 # E : bits set iff byte == 0
80
81 cmpbge zero, t1, t3 # E : bits set iff byte == c
82 or t2, t3, t0 # E :
83 cttz t3, a2 # U0 : speculative (in case we get a match)
84 beq t0, $loop # U :
85
86$found:
87 negq t0, t1 # E : clear all but least set bit
88 and t0, t1, t0 # E :
89 and t0, t3, t1 # E : bit set iff byte was the char
90 addq v0, a2, v0 # E : Add in the bit number from above
91
92 cmoveq t1, $31, v0 # E : Two mapping slots, latency = 2
93 nop
94 nop
95 ret # L0 :
96
97 END(strchr)
98
99weak_alias (strchr, index)
100libc_hidden_builtin_def (strchr)
101

Warning: That file was not part of the compilation database. It may have many parsing errors.