mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 05:02:12 +00:00
fabb626ad6
Cosmetic updates and trivial fixes of m32r arch-dependent files. - Remove RCS ID strings and trailing white lines - Other misc. cosmetic updates Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
2.1 KiB
ArmAsm
118 lines
2.1 KiB
ArmAsm
/*
|
|
* linux/arch/m32r/strlen.S -- strlen code.
|
|
*
|
|
* Copyright (C) 2001 Hirokazu Takata
|
|
*
|
|
* size_t strlen(const char *s);
|
|
*
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <asm/assembler.h>
|
|
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
|
|
|
.text
|
|
ENTRY(strlen)
|
|
mv r6, r0 || ldi r2, #0
|
|
and3 r0, r0, #3
|
|
bnez r0, strlen_byte
|
|
;
|
|
strlen_word:
|
|
ld r0, @r6+
|
|
;
|
|
seth r5, #high(0x01010101)
|
|
or3 r5, r5, #low(0x01010101)
|
|
sll3 r7, r5, #7
|
|
strlen_word_loop:
|
|
ld r1, @r6+ || not r4, r0
|
|
sub r0, r5 || and r4, r7
|
|
and r4, r0
|
|
bnez r4, strlen_last_bytes
|
|
ld r0, @r6+ || not r4, r1
|
|
sub r1, r5 || and r4, r7
|
|
and r4, r1 || addi r2, #4
|
|
bnez r4, strlen_last_bytes
|
|
addi r2, #4 || bra.s strlen_word_loop
|
|
|
|
; NOTE: If a null char. exists, return 0.
|
|
; if ((x - 0x01010101) & ~x & 0x80808080)
|
|
; return 0;
|
|
;
|
|
strlen_byte:
|
|
ldb r1, @r6 || addi r6, #1
|
|
beqz r1, strlen_exit
|
|
addi r2, #1 || bra.s strlen_byte
|
|
;
|
|
strlen_last_bytes:
|
|
ldi r0, #4 || addi r6, #-8
|
|
;
|
|
strlen_byte_loop:
|
|
ldb r1, @r6 || addi r6, #1
|
|
addi r0, #-1 || cmpz r1
|
|
bc.s strlen_exit || cmpz r0
|
|
addi r2, #1 || bnc.s strlen_byte_loop
|
|
;
|
|
strlen_exit:
|
|
mv r0, r2 || jmp r14
|
|
|
|
#else /* not CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
.text
|
|
ENTRY(strlen)
|
|
mv r6, r0
|
|
ldi r2, #0
|
|
and3 r0, r0, #3
|
|
bnez r0, strlen_byte
|
|
;
|
|
strlen_word:
|
|
ld r0, @r6+
|
|
;
|
|
seth r5, #high(0x01010101)
|
|
or3 r5, r5, #low(0x01010101)
|
|
sll3 r7, r5, #7
|
|
strlen_word_loop:
|
|
ld r1, @r6+
|
|
not r4, r0 ; NOTE: If a null char. exists, return 0.
|
|
sub r0, r5 ; if ((x - 0x01010101) & ~x & 0x80808080)
|
|
and r4, r7 ; return 0;
|
|
and r4, r0
|
|
bnez r4, strlen_last_bytes
|
|
addi r2, #4
|
|
;
|
|
ld r0, @r6+
|
|
not r4, r1 ; NOTE: If a null char. exists, return 0.
|
|
sub r1, r5 ; if ((x - 0x01010101) & ~x & 0x80808080)
|
|
and r4, r7 ; return 0;
|
|
and r4, r1
|
|
bnez r4, strlen_last_bytes
|
|
addi r2, #4
|
|
bra strlen_word_loop
|
|
;
|
|
strlen_byte:
|
|
ldb r1, @r6
|
|
addi r6, #1
|
|
beqz r1, strlen_exit
|
|
addi r2, #1
|
|
bra strlen_byte
|
|
;
|
|
strlen_last_bytes:
|
|
ldi r0, #4
|
|
addi r6, #-8
|
|
;
|
|
strlen_byte_loop:
|
|
ldb r1, @r6
|
|
addi r6, #1
|
|
addi r0, #-1
|
|
beqz r1, strlen_exit
|
|
addi r2, #1
|
|
bnez r0, strlen_byte_loop
|
|
;
|
|
strlen_exit:
|
|
mv r0, r2
|
|
jmp r14
|
|
|
|
#endif /* not CONFIG_ISA_DUAL_ISSUE */
|
|
|
|
.end
|