mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-12-29 17:25:38 +00:00
f3c78e949d
Commit ddb5cdbafa ("kbuild: generate KSYMTAB entries by modpost")
deprecated <asm/export.h>, which is now a wrapper of <linux/export.h>.
Replace #include <asm/export.h> with #include <linux/export.h>.
After all the <asm/export.h> lines are converted, <asm/export.h> and
<asm-generic/export.h> will be removed.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
60 lines
1.2 KiB
ArmAsm
60 lines
1.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* strlen.S (c) 1995 David Mosberger (davidm@cs.arizona.edu)
|
|
*
|
|
* Finds length of a 0-terminated string. Optimized for the
|
|
* Alpha architecture:
|
|
*
|
|
* - memory accessed as aligned quadwords only
|
|
* - uses bcmpge to compare 8 bytes in parallel
|
|
* - does binary search to find 0 byte in last
|
|
* quadword (HAKMEM needed 12 instructions to
|
|
* do this instead of the 9 instructions that
|
|
* binary search needs).
|
|
*/
|
|
#include <linux/export.h>
|
|
.set noreorder
|
|
.set noat
|
|
|
|
.align 3
|
|
|
|
.globl strlen
|
|
.ent strlen
|
|
|
|
strlen:
|
|
ldq_u $1, 0($16) # load first quadword ($16 may be misaligned)
|
|
lda $2, -1($31)
|
|
insqh $2, $16, $2
|
|
andnot $16, 7, $0
|
|
or $2, $1, $1
|
|
cmpbge $31, $1, $2 # $2 <- bitmask: bit i == 1 <==> i-th byte == 0
|
|
bne $2, found
|
|
|
|
loop: ldq $1, 8($0)
|
|
addq $0, 8, $0 # addr += 8
|
|
nop # helps dual issue last two insns
|
|
cmpbge $31, $1, $2
|
|
beq $2, loop
|
|
|
|
found: blbs $2, done # make aligned case fast
|
|
negq $2, $3
|
|
and $2, $3, $2
|
|
|
|
and $2, 0x0f, $1
|
|
addq $0, 4, $3
|
|
cmoveq $1, $3, $0
|
|
|
|
and $2, 0x33, $1
|
|
addq $0, 2, $3
|
|
cmoveq $1, $3, $0
|
|
|
|
and $2, 0x55, $1
|
|
addq $0, 1, $3
|
|
cmoveq $1, $3, $0
|
|
|
|
done: subq $0, $16, $0
|
|
ret $31, ($26)
|
|
|
|
.end strlen
|
|
EXPORT_SYMBOL(strlen)
|