brickos: lib/mint/mulhi3.c Source File

00001 
00006 /*
00007  *  The contents of this file are subject to the Mozilla Public License
00008  *  Version 1.0 (the "License"); you may not use this file except in
00009  *  compliance with the License. You may obtain a copy of the License at
00010  *  http://www.mozilla.org/MPL/
00011  *
00012  *  Software distributed under the License is distributed on an "AS IS"
00013  *  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
00014  *  License for the specific language governing rights and limitations
00015  *  under the License.
00016  *
00017  *  The Original Code is legOS code, released October 17, 1999.
00018  *
00019  *  The Initial Developer of the Original Code is Markus L. Noga.
00020  *  Portions created by Markus L. Noga are Copyright (C) 1999
00021  *  Markus L. Noga. All Rights Reserved.
00022  *
00023  *  Contributor(s): Markus L. Noga <markus@noga.de>
00024  */
00025 
00027 
00031 int __mulhi3(int a,int b);
00032 
00033 __asm__ ("\n\
00034 .section .text\n\
00035 .global ___mulhi3\n\
00036 ___mulhi3:\n\
00037       ; param   r0,r1\n\
00038       ; return  r0\n\
00039       ; clobber r2\n\
00040     \n\
00041       mov.w    r0,r2\n\
00042       mulxu.b  r1h,r2\n\
00043       mov.b    r0h,r2h\n\
00044       mulxu.b  r1l,r0\n\
00045       add.b    r2l,r0h\n\
00046       mulxu.b  r2h,r1\n\
00047       add.b    r1l,r0h\n\
00048       rts\n\
00049 ");