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Annotation of Net2/arch/tahoe/math/kcmpf.s, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1985 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Computer Consoles Inc.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)Kcmpf.s     7.1 (Berkeley) 12/6/90
        !            37:  */
        !            38: 
        !            39: #include "../tahoe/SYS.h"
        !            40: 
        !            41: /*
        !            42:  * cmpf(o1, o2)
        !            43:  *     register o1, o2;
        !            44:  *{
        !            45:  *     if(o1 < 0) {
        !            46:  *             o1 ^= 0x80000000;
        !            47:  *             o1 = -o1;
        !            48:  *     }
        !            49:  *     if(o2 < 0) {
        !            50:  *             o2 ^= 0x80000000;
        !            51:  *             o2 = -o2;
        !            52:  *     }
        !            53:  *     if(o1 != o2)
        !            54:  *             return(o1>o2 ? 1 : -1);
        !            55:  *     return(0);
        !            56:  *}
        !            57:  */
        !            58:        .text
        !            59: ENTRY(Kcmpf, 0)
        !            60:        movl    4(fp),r12
        !            61:        jgeq    1f
        !            62:        xorl2   $0x80000000,r12
        !            63:        mnegl   r12,r12
        !            64: 1:
        !            65:        movl    12(fp),r11
        !            66:        jgeq    1f
        !            67:        xorl2   $0x80000000,r11
        !            68:        mnegl   r11,r11
        !            69: 1:
        !            70:        cmpl    r12,r11
        !            71:        jneq    1f
        !            72:        clr     r0; ret
        !            73: 1:
        !            74:        jleq    1f
        !            75:        movl    $1,r0; ret
        !            76: 1:
        !            77:        mnegl   $1,r0; ret

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