58 lines
1012 B
ArmAsm
58 lines
1012 B
ArmAsm
/*
|
|
* Written by J.T. Conklin <jtc@NetBSD.org>.
|
|
* Public domain.
|
|
* Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl@wasabisystems.com>
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
#if defined(LIBC_SCCS)
|
|
RCSID("$NetBSD: strcpy.S,v 1.2 2003/07/26 19:24:40 salo 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)
|
|
movq %rdi,%r11
|
|
|
|
L1: movb (%rsi),%al /* unroll loop, but not too much */
|
|
movb %al,(%rdi)
|
|
testb %al,%al
|
|
jz L2
|
|
movb 1(%rsi),%al
|
|
movb %al,1(%rdi)
|
|
testb %al,%al
|
|
jz L2
|
|
movb 2(%rsi),%al
|
|
movb %al,2(%rdi)
|
|
testb %al,%al
|
|
jz L2
|
|
movb 3(%rsi),%al
|
|
movb %al,3(%rdi)
|
|
testb %al,%al
|
|
jz L2
|
|
movb 4(%rsi),%al
|
|
movb %al,4(%rdi)
|
|
testb %al,%al
|
|
jz L2
|
|
movb 5(%rsi),%al
|
|
movb %al,5(%rdi)
|
|
testb %al,%al
|
|
jz L2
|
|
movb 6(%rsi),%al
|
|
movb %al,6(%rdi)
|
|
testb %al,%al
|
|
jz L2
|
|
movb 7(%rsi),%al
|
|
movb %al,7(%rdi)
|
|
addq $8,%rsi
|
|
addq $8,%rdi
|
|
testb %al,%al
|
|
jnz L1
|
|
L2: movq %r11,%rax
|
|
ret
|