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teq -> cmp

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ip -> r2
add/sub -> adds/subs
(thumbify part 1)
This commit is contained in:
matt 2013-08-19 02:07:22 +00:00
parent 4373b1a3d8
commit ad93040ca6
1 changed files with 10 additions and 9 deletions
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19
common/lib/libc/arch/arm/string/strlen_naive.S
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@ -28,19 +28,19 @@
*/
#include <machine/asm.h>
RCSID("$NetBSD: strlen_naive.S,v 1.3 2013/01/23 06:59:55 matt Exp $")
RCSID("$NetBSD: strlen_naive.S,v 1.4 2013/08/19 02:07:22 matt Exp $")
#ifdef STRNLEN
/* LINTSTUB: size_t strnlen(const char *, size_t) */
ENTRY(strnlen)
add ip, r0, #1 /* start of src + NUL */
add r2, r0, r1 /* &src[maxlen] */
adds r2, r0, #1 /* start of src + NUL */
adds r2, r0, r1 /* &src[maxlen] */
1: cmp r0, r2 /* is this of string? */
beq 2f /* yes it is */
ldrb r3, [r0], #1 /* read a byte */
teq r3, #0 /* is it a NUL? */
cmp r3, #0 /* is it a NUL? */
bne 1b /* no, get next byte */
sub r0, r0, ip /* get difference between start and end */
subs r0, r0, r2 /* get difference between start and end */
RET /* return */
2: mov r0, r1 /* get maxlen */
RET /* return */
@ -48,11 +48,12 @@ END(strnlen)
#else /* STRNLEN */
/* LINTSTUB: size_t strlen(const char *) */
ENTRY(strlen)
add ip, r0, #1 /* start of src + NUL */
1: ldrb r3, [r0], #1 /* read a byte */
teq r3, #0 /* is it a NUL? */
adds r2, r0, #1 /* start of src + NUL */
1:
ldrb r3, [r0], #1 /* read a byte */
cmp r3, #0 /* is it a NUL? */
bne 1b /* no, get next byte */
sub r0, r0, ip /* return difference between start and end */
subs r0, r0, r2 /* return difference between start and end */
RET
END(strlen)
#endif /* !STRNLEN */