cmpsi2.c

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/*
 *  cmpsi2.c
 *
 *  Implementation of cmpsi2, a 32-bit signed compare: r0r1 <=> r2r3
 *  Returns -1, 0, or 1, which might not be correct.
 *
 *  The contents of this file are subject to the Mozilla Public License
 *  Version 1.0 (the "License"); you may not use this file except in
 *  compliance with the License. You may obtain a copy of the License at
 *  http://www.mozilla.org/MPL/
 *
 *  Software distributed under the License is distributed on an "AS IS"
 *  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 *  License for the specific language governing rights and limitations
 *  under the License.
 *
 *  The Original Code is Librcx code, released February 9, 1999.
 *
 *  The Initial Developer of the Original Code is Kekoa Proudfoot.
 *  Portions created by Kekoa Proudfoot are Copyright (C) 1999
 *  Kekoa Proudfoot. All Rights Reserved.
 *
 *  Contributor(s): Kekoa Proudfoot <kekoa@graphics.stanford.edu>
 */

__asm__ ("\n\
        .section .text\n\
\n\
        .global ___cmpsi2\n\
\n\
___cmpsi2:\n\
\n\
        sub.w   r3,r1\n\
        subx.b  r2l,r0l\n\
        subx.b  r2h,r0h\n\
\n\
        blt             else_0\n\
\n\
                beq             else_1\n\
\n\
                        ; First operand greater than second operand\n\
\n\
                        mov.w   #1,r0\n\
                        rts\n\
\n\
                else_1:\n\
\n\
                        ; First operand equal to second operand\n\
\n\
                        sub.w   r0,r0\n\
                        rts\n\
\n\
                endif_1:\n\
\n\
        else_0:\n\
\n\
                ; First operand less than second operand\n\
\n\
                mov.w   #-1,r0\n\
                rts\n\
\n\
        endif_0:\n\
\n\
        ; Not reached\n\
");

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