1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * arch/alpha/lib/strcat.S
 4 * Contributed by Richard Henderson (rth@tamu.edu)
 5 *
 6 * Append a null-terminated string from SRC to DST.
 7 */
 8#include <linux/export.h>
 9
10	.text
11
12	.align 3
13	.globl strcat
14	.ent strcat
15strcat:
16	.frame $30, 0, $26
17	.prologue 0
18
19	mov	$16, $0		# set up return value
20
21	/* Find the end of the string.  */
22
23	ldq_u   $1, 0($16)	# load first quadword (a0 may be misaligned)
24	lda     $2, -1
25	insqh   $2, $16, $2
26	andnot  $16, 7, $16
27	or      $2, $1, $1
28	cmpbge  $31, $1, $2	# bits set iff byte == 0
29	bne     $2, $found
30
31$loop:	ldq     $1, 8($16)
32	addq    $16, 8, $16
33	cmpbge  $31, $1, $2
34	beq     $2, $loop
35
36$found:	negq    $2, $3		# clear all but least set bit
37	and     $2, $3, $2
38
39	and     $2, 0xf0, $3	# binary search for that set bit
40	and	$2, 0xcc, $4
41	and	$2, 0xaa, $5
42	cmovne	$3, 4, $3
43	cmovne	$4, 2, $4
44	cmovne	$5, 1, $5
45	addq	$3, $4, $3
46	addq	$16, $5, $16
47	addq	$16, $3, $16
48
49	/* Now do the append.  */
50
51	mov	$26, $23
52	br	__stxcpy
53
54	.end strcat
55EXPORT_SYMBOL(strcat);

 
 1/*
 2 * arch/alpha/lib/strcat.S
 3 * Contributed by Richard Henderson (rth@tamu.edu)
 4 *
 5 * Append a null-terminated string from SRC to DST.
 6 */
 
 7
 8	.text
 9
10	.align 3
11	.globl strcat
12	.ent strcat
13strcat:
14	.frame $30, 0, $26
15	.prologue 0
16
17	mov	$16, $0		# set up return value
18
19	/* Find the end of the string.  */
20
21	ldq_u   $1, 0($16)	# load first quadword (a0 may be misaligned)
22	lda     $2, -1
23	insqh   $2, $16, $2
24	andnot  $16, 7, $16
25	or      $2, $1, $1
26	cmpbge  $31, $1, $2	# bits set iff byte == 0
27	bne     $2, $found
28
29$loop:	ldq     $1, 8($16)
30	addq    $16, 8, $16
31	cmpbge  $31, $1, $2
32	beq     $2, $loop
33
34$found:	negq    $2, $3		# clear all but least set bit
35	and     $2, $3, $2
36
37	and     $2, 0xf0, $3	# binary search for that set bit
38	and	$2, 0xcc, $4
39	and	$2, 0xaa, $5
40	cmovne	$3, 4, $3
41	cmovne	$4, 2, $4
42	cmovne	$5, 1, $5
43	addq	$3, $4, $3
44	addq	$16, $5, $16
45	addq	$16, $3, $16
46
47	/* Now do the append.  */
48
49	mov	$26, $23
50	br	__stxcpy
51
52	.end strcat