diff options
Diffstat (limited to 'sys/lib/libkern/arch/i386/bcmp.S')
| -rw-r--r-- | sys/lib/libkern/arch/i386/bcmp.S | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/sys/lib/libkern/arch/i386/bcmp.S b/sys/lib/libkern/arch/i386/bcmp.S new file mode 100644 index 00000000000..12d344216cc --- /dev/null +++ b/sys/lib/libkern/arch/i386/bcmp.S @@ -0,0 +1,35 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + */ + +#include <machine/asm.h> + +#if defined(LIBC_SCCS) + RCSID("$NetBSD: bcmp.S,v 1.5 1995/10/07 09:27:01 mycroft Exp $") +#endif + +ENTRY(bcmp) + pushl %edi + pushl %esi + movl 12(%esp),%edi + movl 16(%esp),%esi + xorl %eax,%eax /* clear return value */ + cld /* set compare direction forward */ + + movl 20(%esp),%ecx /* compare by words */ + shrl $2,%ecx + repe + cmpsl + jne L1 + + movl 20(%esp),%ecx /* compare remainder by bytes */ + andl $3,%ecx + repe + cmpsb + je L2 + +L1: incl %eax +L2: popl %esi + popl %edi + ret |