| /*- |
| * Copyright (c) 2003 Peter Wemm. |
| * Copyright (c) 1993 The Regents of the University of California. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 4. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * |
| * $FreeBSD$ |
| */ |
| |
| |
| |
| /* |
| * bcopy(src, dst, cnt) |
| * rdi, rsi, rdx |
| * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 |
| */ |
| .text |
| .align 4 |
| .globl bcopy |
| .type bcopy, @function |
| bcopy: |
| xchgq %rsi,%rdi |
| movq %rdx,%rcx |
| |
| movq %rdi,%rax |
| subq %rsi,%rax |
| cmpq %rcx,%rax /* overlapping && src < dst? */ |
| jb 1f |
| |
| shrq $3,%rcx /* copy by 64-bit words */ |
| cld /* nope, copy forwards */ |
| rep |
| movsq |
| movq %rdx,%rcx |
| andq $7,%rcx /* any bytes left? */ |
| rep |
| movsb |
| ret |
| |
| /* ALIGN_TEXT */ |
| 1: |
| addq %rcx,%rdi /* copy backwards */ |
| addq %rcx,%rsi |
| decq %rdi |
| decq %rsi |
| andq $7,%rcx /* any fractional bytes? */ |
| std |
| rep |
| movsb |
| movq %rdx,%rcx /* copy remainder by 32-bit words */ |
| shrq $3,%rcx |
| subq $7,%rsi |
| subq $7,%rdi |
| rep |
| movsq |
| cld |
| ret |
| .size bcopy,.-bcopy |
| |
| |
