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688903eb | 1 | /* Copyright (C) 2000-2018 Free Software Foundation, Inc. |
5f5831be | 2 | EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>. |
5f5831be UD |
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 | |
3214b89b AJ |
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. | |
5f5831be UD |
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 | |
3214b89b | 13 | Lesser General Public License for more details. |
5f5831be | 14 | |
3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
5f5831be UD |
18 | |
19 | /* Return the address of the last occurrence of a given character | |
20 | within a null-terminated string, or null if it is not found. */ | |
21 | ||
22 | #include <sysdep.h> | |
23 | ||
24 | .arch ev6 | |
25 | .set noreorder | |
26 | .set noat | |
27 | ||
28 | ENTRY(strrchr) | |
29 | #ifdef PROF | |
30 | ldgp gp, 0(pv) | |
31 | lda AT, _mcount | |
32 | jsr AT, (AT), _mcount | |
33 | .prologue 1 | |
34 | #else | |
35 | .prologue 0 | |
36 | #endif | |
37 | ||
38 | and a1, 0xff, t2 # E : 00000000000000ch | |
39 | insbl a1, 1, t4 # U : 000000000000ch00 | |
40 | insbl a1, 2, t5 # U : 0000000000ch0000 | |
41 | ldq_u t0, 0(a0) # L : load first quadword Latency=3 | |
42 | ||
43 | mov zero, t6 # E : t6 is last match aligned addr | |
44 | or t2, t4, a1 # E : 000000000000chch | |
45 | sll t5, 8, t3 # U : 00000000ch000000 | |
46 | mov zero, t8 # E : t8 is last match byte compare mask | |
47 | ||
48 | andnot a0, 7, v0 # E : align source addr | |
49 | or t5, t3, t3 # E : 00000000chch0000 | |
50 | sll a1, 32, t2 # U : 0000chch00000000 | |
51 | sll a1, 48, t4 # U : chch000000000000 | |
52 | ||
53 | or t4, a1, a1 # E : chch00000000chch | |
54 | or t2, t3, t2 # E : 0000chchchch0000 | |
55 | or a1, t2, a1 # E : chchchchchchchch | |
56 | lda t5, -1 # E : build garbage mask | |
57 | ||
58 | cmpbge zero, t0, t1 # E : bits set iff byte == zero | |
59 | mskqh t5, a0, t4 # E : Complete garbage mask | |
60 | xor t0, a1, t2 # E : make bytes == c zero | |
61 | cmpbge zero, t4, t4 # E : bits set iff byte is garbage | |
62 | ||
63 | cmpbge zero, t2, t3 # E : bits set iff byte == c | |
64 | andnot t1, t4, t1 # E : clear garbage from null test | |
65 | andnot t3, t4, t3 # E : clear garbage from char test | |
66 | bne t1, $eos # U : did we already hit the terminator? | |
67 | ||
68 | /* Character search main loop */ | |
69 | $loop: | |
70 | ldq t0, 8(v0) # L : load next quadword | |
71 | cmovne t3, v0, t6 # E : save previous comparisons match | |
72 | nop # : Latency=2, extra map slot (keep nop with cmov) | |
73 | nop | |
74 | ||
75 | cmovne t3, t3, t8 # E : Latency=2, extra map slot | |
76 | nop # : keep with cmovne | |
77 | addq v0, 8, v0 # E : | |
78 | xor t0, a1, t2 # E : | |
79 | ||
80 | cmpbge zero, t0, t1 # E : bits set iff byte == zero | |
81 | cmpbge zero, t2, t3 # E : bits set iff byte == c | |
82 | beq t1, $loop # U : if we havnt seen a null, loop | |
83 | nop | |
84 | ||
85 | /* Mask out character matches after terminator */ | |
86 | $eos: | |
87 | negq t1, t4 # E : isolate first null byte match | |
88 | and t1, t4, t4 # E : | |
89 | subq t4, 1, t5 # E : build a mask of the bytes upto... | |
90 | or t4, t5, t4 # E : ... and including the null | |
91 | ||
92 | and t3, t4, t3 # E : mask out char matches after null | |
93 | cmovne t3, t3, t8 # E : save it, if match found Latency=2, extra map slot | |
94 | nop # : Keep with cmovne | |
95 | nop | |
96 | ||
97 | cmovne t3, v0, t6 # E : | |
98 | nop # : Keep with cmovne | |
99 | /* Locate the address of the last matched character */ | |
100 | ctlz t8, t2 # U0 : Latency=3 (0x40 for t8=0) | |
101 | nop | |
102 | ||
103 | cmoveq t8, 0x3f, t2 # E : Compensate for case when no match is seen | |
104 | nop # E : hide the cmov latency (2) behind ctlz latency | |
105 | lda t5, 0x3f($31) # E : | |
106 | subq t5, t2, t5 # E : Normalize leading zero count | |
107 | ||
108 | addq t6, t5, v0 # E : and add to quadword address | |
109 | ret # L0 : Latency=3 | |
110 | nop | |
111 | nop | |
112 | ||
113 | END(strrchr) | |
114 | ||
115 | weak_alias (strrchr, rindex) | |
79b7c863 | 116 | libc_hidden_builtin_def (strrchr) |