Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Use movw on armv7 to fill uppper halfword.

Browse Source
This commit is contained in:
matt 2013-01-09 00:01:07 +00:00
parent 3ccf78bfe7
commit 0e293547ab
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
common/lib/libc/arch/arm/string/strlen_arm.S
View File

@ -29,7 +29,7 @@
#include <machine/asm.h>
RCSID("$NetBSD: strlen_arm.S,v 1.1 2013/01/08 13:17:45 matt Exp $")
RCSID("$NetBSD: strlen_arm.S,v 1.2 2013/01/09 00:01:07 matt Exp $")
#ifdef __ARMEL__
#define BYTE0 0x000000ff
@ -55,13 +55,12 @@ ENTRY(strlen)
sub r0, r0, ip /* subtract start */
RET /* return */
.Lpre_main_loop:
#if defined(_ARM_ARCH_6)
#if defined(_ARM_ARCH_7)
movw r1, #0xfefe /* magic constant; 254 in each byte */
#else
movt r1, #0xfefe /* magic constant; 254 in each byte */
#elif defined(_ARM_ARCH_6)
mov r1, #0xfe /* put 254 in low byte */
orr r1, r1, r1, lsl #8 /* move to next byte */
#endif
orr r1, r1, r1, lsl #16 /* move to next halfword */
#endif /* _ARM_ARCH_6 */
.Lmain_loop: