blkcpy.S revision 1.2.20.3
1 1.2.20.3 skrll /* $NetBSD: blkcpy.S,v 1.2.20.3 2004/09/21 13:36:13 skrll Exp $ */ 2 1.2.20.1 skrll /* 3 1.2.20.1 skrll * Copyright (c) 1983, 1993 4 1.2.20.1 skrll * 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 1.2.20.1 skrll * 3. Neither the name of the University nor the names of its contributors 15 1.2.20.1 skrll * may be used to endorse or promote products derived from this software 16 1.2.20.1 skrll * without specific prior written permission. 17 1.1 thorpej * 18 1.2.20.1 skrll * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 1.2.20.1 skrll * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 1.2.20.1 skrll * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 1.2.20.1 skrll * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 1.2.20.1 skrll * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 1.2.20.1 skrll * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 1.2.20.1 skrll * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 1.2.20.1 skrll * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 1.2.20.1 skrll * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 1.2.20.1 skrll * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 1.2.20.1 skrll * SUCH DAMAGE. 29 1.1 thorpej */ 30 1.1 thorpej #include <machine/asm.h> 31 1.1 thorpej 32 1.2.20.1 skrll /* __blkcpy(from, to, size) */ 33 1.2.20.1 skrll 34 1.2.20.1 skrll 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 1.2.20.1 skrll cmpl %r1,%r3 39 1.2.20.1 skrll bgtr 2f # normal forward case 40 1.2.20.1 skrll blss 3f # overlapping, must do backwards 41 1.2.20.1 skrll ret # equal, nothing to do 42 1.2.20.1 skrll 1: 43 1.2.20.1 skrll subl2 %r0,%r6 44 1.2 matt movc3 %r0,(%r1),(%r3) 45 1.2.20.1 skrll 2: 46 1.2.20.1 skrll movzwl $65535,%r0 47 1.2 matt cmpl %r6,%r0 48 1.1 thorpej jgtr 1b 49 1.2 matt movc3 %r6,(%r1),(%r3) 50 1.1 thorpej ret 51 1.2.20.1 skrll 3: 52 1.2.20.1 skrll addl2 %r6,%r1 53 1.2.20.1 skrll addl2 %r6,%r3 54 1.2.20.1 skrll movzwl $65535,%r0 55 1.2.20.1 skrll jbr 5f 56 1.2.20.1 skrll 4: 57 1.2.20.1 skrll subl2 %r0,%r6 58 1.2.20.1 skrll subl2 %r0,%r1 59 1.2.20.1 skrll subl2 %r0,%r3 60 1.2.20.1 skrll movc3 %r0,(%r1),(%r3) 61 1.2.20.1 skrll movzwl $65535,%r0 62 1.2.20.1 skrll subl2 %r0,%r1 63 1.2.20.1 skrll subl2 %r0,%r3 64 1.2.20.1 skrll 5: 65 1.2.20.1 skrll cmpl %r6,%r0 66 1.2.20.1 skrll jgtr 4b 67 1.2.20.1 skrll subl2 %r6,%r1 68 1.2.20.1 skrll subl2 %r6,%r3 69 1.2.20.1 skrll movc3 %r6,(%r1),(%r3) 70 1.2.20.1 skrll ret 71
Indexes created Thu Sep 25 08:09:54 GMT 2025