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Annotation of Net2/arch/tahoe/math/kcmpd.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:  *     @(#)Kcmpd.s     7.1 (Berkeley) 12/6/90
        !            37:  */
        !            38: 
        !            39: #include "../tahoe/SYS.h"
        !            40: 
        !            41: /*
        !            42:  * cmpd(hi1, lo1, hi2, lo2)
        !            43:  *     register hi1, hi2;
        !            44:  *     register unsigned lo1, lo2;
        !            45:  *{
        !            46:  *     if(hi1 < 0) {
        !            47:  *             hi1 ^= 0x80000000;
        !            48:  *             if(lo1) {
        !            49:  *                     lo1 = -lo1;
        !            50:  *                     hi1 = ~hi1;
        !            51:  *             } else
        !            52:  *                     hi1 = -hi1;
        !            53:  *     }
        !            54:  *     if(hi2 < 0) {
        !            55:  *             hi2 ^= 0x80000000;
        !            56:  *             if(lo2) {
        !            57:  *                     lo2 = -lo2;
        !            58:  *                     hi2 = ~hi2;
        !            59:  *             } else
        !            60:  *                     hi2 = -hi2;
        !            61:  *     }
        !            62:  *     if(hi1 != hi2)
        !            63:  *             return(hi1>hi2 ? 1 : -1);
        !            64:  *     if(lo1 != lo2)
        !            65:  *             return(lo1>lo2 ? 1 : -1);
        !            66:  *     return(0);
        !            67:  *}
        !            68:  */
        !            69:        .text
        !            70: ENTRY(Kcmpd, 0)
        !            71:        movl    8(fp),r3
        !            72:        movl    12(fp),r4
        !            73:        movl    16(fp),r2
        !            74:        movl    4(fp),r5
        !            75:        jgeq    1f
        !            76:        xorl2   $0x80000000,r5
        !            77:        tstl    r3
        !            78:        jeql    2f
        !            79:        mnegl   r3,r3
        !            80:        mcoml   r5,r5
        !            81:        jbr     1f
        !            82: 2:
        !            83:        mnegl   r5,r5
        !            84: 1:
        !            85:        tstl    r4
        !            86:        jgeq    1f
        !            87:        xorl2   $0x80000000,r4
        !            88:        tstl    r2
        !            89:        jeql    2f
        !            90:        mnegl   r2,r2
        !            91:        mcoml   r4,r4
        !            92:        jbr     1f
        !            93: 2:
        !            94:        mnegl   r4,r4
        !            95: 1:
        !            96:        cmpl    r5,r4
        !            97:        jeql    1f
        !            98:        jleq    2f
        !            99:        movl    $1,r0
        !           100:        ret
        !           101: 2:
        !           102:        mnegl   $1,r0
        !           103:        ret
        !           104: 1:
        !           105:        cmpl    r3,r2
        !           106:        jeql    1f
        !           107:        jlequ   2f
        !           108:        movl    $1,r0
        !           109:        ret
        !           110: 2:
        !           111:        mnegl   $1,r0
        !           112:        ret
        !           113: 1:
        !           114:        clrl    r0
        !           115:        ret

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