blkcpy.S revision 1.4
1 1.4 christos /* $NetBSD: blkcpy.S,v 1.4 2005/12/11 12:24:45 christos Exp $ */ 2 1.3 ragge /* 3 1.3 ragge * Copyright (c) 1983, 1993 4 1.3 ragge * The Regents of the University of California. All rights reserved. 5 1.1 thorpej * 6 1.1 thorpej * Redistribution and use in source and binary forms, with or without 7 1.1 thorpej * modification, are permitted provided that the following conditions 8 1.1 thorpej * are met: 9 1.1 thorpej * 1. Redistributions of source code must retain the above copyright 10 1.1 thorpej * notice, this list of conditions and the following disclaimer. 11 1.1 thorpej * 2. Redistributions in binary form must reproduce the above copyright 12 1.1 thorpej * notice, this list of conditions and the following disclaimer in the 13 1.1 thorpej * documentation and/or other materials provided with the distribution. 14 1.3 ragge * 3. Neither the name of the University nor the names of its contributors 15 1.3 ragge * may be used to endorse or promote products derived from this software 16 1.3 ragge * without specific prior written permission. 17 1.1 thorpej * 18 1.3 ragge * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 1.3 ragge * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 1.3 ragge * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 1.3 ragge * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 1.3 ragge * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 1.3 ragge * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 1.3 ragge * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.3 ragge * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 1.3 ragge * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 1.3 ragge * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 1.3 ragge * SUCH DAMAGE. 29 1.1 thorpej */ 30 1.3 ragge #include <machine/asm.h> 31 1.1 thorpej 32 1.3 ragge /* __blkcpy(from, to, size) */ 33 1.1 thorpej 34 1.3 ragge ENTRY(__blkcpy, R6) 35 1.2 matt movl 4(%ap),%r1 36 1.2 matt movl 8(%ap),%r3 37 1.2 matt movl 12(%ap),%r6 38 1.3 ragge cmpl %r1,%r3 39 1.3 ragge bgtr 2f # normal forward case 40 1.3 ragge blss 3f # overlapping, must do backwards 41 1.3 ragge ret # equal, nothing to do 42 1.3 ragge 1: 43 1.3 ragge subl2 %r0,%r6 44 1.2 matt movc3 %r0,(%r1),(%r3) 45 1.3 ragge 2: 46 1.3 ragge movzwl $65535,%r0 47 1.2 matt cmpl %r6,%r0 48 1.1 thorpej jgtr 1b 49 1.3 ragge movc3 %r6,(%r1),(%r3) 50 1.3 ragge ret 51 1.3 ragge 3: 52 1.3 ragge addl2 %r6,%r1 53 1.3 ragge addl2 %r6,%r3 54 1.3 ragge movzwl $65535,%r0 55 1.3 ragge jbr 5f 56 1.3 ragge 4: 57 1.3 ragge subl2 %r0,%r6 58 1.3 ragge subl2 %r0,%r1 59 1.3 ragge subl2 %r0,%r3 60 1.3 ragge movc3 %r0,(%r1),(%r3) 61 1.3 ragge movzwl $65535,%r0 62 1.3 ragge subl2 %r0,%r1 63 1.3 ragge subl2 %r0,%r3 64 1.3 ragge 5: 65 1.3 ragge cmpl %r6,%r0 66 1.3 ragge jgtr 4b 67 1.3 ragge subl2 %r6,%r1 68 1.3 ragge subl2 %r6,%r3 69 1.2 matt movc3 %r6,(%r1),(%r3) 70 1.1 thorpej ret 71
Indexes created Tue Sep 23 02:09:52 GMT 2025