1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * arch/alpha/lib/ev67-strcat.S
4 * 21264 version contributed by Rick Gorton <ri
5 *
6 * Append a null-terminated string from SRC to
7 *
8 * Much of the information about 21264 schedul
9 * Compiler Writer's Guide for the Alpha
10 * abbreviated as 'CWG' in other comments
11 * ftp.digital.com/pub/Digital/info/semic
12 * Scheduling notation:
13 * E - either cluster
14 * U - upper subcluster; U0 - subcl
15 * L - lower subcluster; L0 - subcl
16 * Try not to change the actual algorithm if p
17 * Commentary: It seems bogus to walk the inpu
18 * to determine the length, and then again whi
19 * A significant (future) enhancement would be
20 * string once.
21 */
22
23 #include <linux/export.h>
24 .text
25
26 .align 4
27 .globl strcat
28 .ent strcat
29 strcat:
30 .frame $30, 0, $26
31 .prologue 0
32
33 mov $16, $0 # E : set up r
34 /* Find the end of the string. */
35 ldq_u $1, 0($16) # L : load fir
36 lda $2, -1 # E :
37 insqh $2, $16, $2 # U :
38
39 andnot $16, 7, $16 # E :
40 or $2, $1, $1 # E :
41 cmpbge $31, $1, $2 # E : bits set
42 bne $2, $found # U :
43
44 $loop: ldq $1, 8($16) # L :
45 addq $16, 8, $16 # E :
46 cmpbge $31, $1, $2 # E :
47 beq $2, $loop # U :
48
49 $found: cttz $2, $3 # U0 :
50 addq $16, $3, $16 # E :
51 /* Now do the append. */
52 mov $26, $23 # E :
53 br __stxcpy # L0 :
54
55 .end strcat
56 EXPORT_SYMBOL(strcat)
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