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/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <machine/asm.h>
#if defined(LIBC_SCCS)
.text
.asciz "$OpenBSD: strcpy.S,v 1.2 1996/08/19 08:13:17 tholo Exp $"
#endif
/*
* NOTE: I've unrolled the loop eight times: large enough to make a
* significant difference, and small enough not to totally trash the
* cache.
*/
ENTRY(strcpy)
movl 4(%esp),%ecx /* dst address */
movl 8(%esp),%edx /* src address */
pushl %ecx /* push dst address */
.align 2,0x90
L1: movb (%edx),%al /* unroll loop, but not too much */
movb %al,(%ecx)
testb %al,%al
jz L2
movb 1(%edx),%al
movb %al,1(%ecx)
testb %al,%al
jz L2
movb 2(%edx),%al
movb %al,2(%ecx)
testb %al,%al
jz L2
movb 3(%edx),%al
movb %al,3(%ecx)
testb %al,%al
jz L2
movb 4(%edx),%al
movb %al,4(%ecx)
testb %al,%al
jz L2
movb 5(%edx),%al
movb %al,5(%ecx)
testb %al,%al
jz L2
movb 6(%edx),%al
movb %al,6(%ecx)
testb %al,%al
jz L2
movb 7(%edx),%al
movb %al,7(%ecx)
addl $8,%edx
addl $8,%ecx
testb %al,%al
jnz L1
L2: popl %eax /* pop dst address */
ret
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