10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7298SMark.J.Nelson@Sun.COM * Common Development and Distribution License (the "License"). 6*7298SMark.J.Nelson@Sun.COM * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 210Sstevel@tonic-gate/* 220Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 230Sstevel@tonic-gate * Use is subject to license terms. 240Sstevel@tonic-gate */ 250Sstevel@tonic-gate 26*7298SMark.J.Nelson@Sun.COM .file "_mul64.s" 270Sstevel@tonic-gate 280Sstevel@tonic-gate/ 290Sstevel@tonic-gate/ function __mul64(A,B:Longint):Longint; 300Sstevel@tonic-gate/ {Overflow is not checked} 310Sstevel@tonic-gate/ 320Sstevel@tonic-gate/ We essentially do multiply by longhand, using base 2**32 digits. 330Sstevel@tonic-gate/ a b parameter A 340Sstevel@tonic-gate/ x c d parameter B 350Sstevel@tonic-gate/ --------- 360Sstevel@tonic-gate/ ad bd 370Sstevel@tonic-gate/ ac bc 380Sstevel@tonic-gate/ ----------------- 390Sstevel@tonic-gate/ ac ad+bc bd 400Sstevel@tonic-gate/ 410Sstevel@tonic-gate/ We can ignore ac and top 32 bits of ad+bc: if <> 0, overflow happened. 420Sstevel@tonic-gate/ 430Sstevel@tonic-gate 440Sstevel@tonic-gate#include "SYS.h" 450Sstevel@tonic-gate 460Sstevel@tonic-gate ENTRY(__mul64) 470Sstevel@tonic-gate push %ebp 480Sstevel@tonic-gate mov %esp,%ebp 490Sstevel@tonic-gate pushl %esi 500Sstevel@tonic-gate mov 12(%ebp),%eax / A.hi (a) 510Sstevel@tonic-gate mull 16(%ebp) / Multiply A.hi by B.lo (produces ad) 520Sstevel@tonic-gate xchg %ecx,%eax / ecx = bottom half of ad. 530Sstevel@tonic-gate movl 8(%ebp),%eax / A.Lo (b) 540Sstevel@tonic-gate movl %eax,%esi / Save A.lo for later 550Sstevel@tonic-gate mull 16(%ebp) / Multiply A.Lo by B.LO (dx:ax = bd.) 560Sstevel@tonic-gate addl %edx,%ecx / cx is ad 570Sstevel@tonic-gate xchg %eax,%esi / esi is bd, eax = A.lo (d) 580Sstevel@tonic-gate mull 20(%ebp) / Multiply A.lo * B.hi (producing bc) 590Sstevel@tonic-gate addl %ecx,%eax / Produce ad+bc 600Sstevel@tonic-gate movl %esi,%edx 610Sstevel@tonic-gate xchg %eax,%edx 620Sstevel@tonic-gate popl %esi 630Sstevel@tonic-gate movl %ebp,%esp 640Sstevel@tonic-gate popl %ebp 650Sstevel@tonic-gate ret $16 660Sstevel@tonic-gate SET_SIZE(__mul64) 67