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Annotation of Net2/arch/tahoe/math/ksubf.s, revision 1.1.1.1

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:  *     @(#)Ksubf.s     7.1 (Berkeley) 12/6/90
                     37:  */
                     38: 
                     39: #include "../tahoe/SYS.h"
                     40: 
                     41: /*
                     42:  * _Ksubf(acc_most,acc_least,op_most,op_least,hfs)
                     43:  *
                     44:  * subf(d1,d2)
                     45:  * {
                     46:  *     return(d1+(-d2));
                     47:  * }
                     48:  */
                     49:        .text
                     50: ENTRY(Ksubf, 0)
                     51:        tstl    4(fp)   # handle (a-b) where a and/or b = 0.0
                     52:        jneq    next
                     53:        movl    $0,r1
                     54:        movl    12(fp),r0
                     55:        lnd     r0
                     56:        std     r0
                     57:        ret
                     58: next:
                     59:        tstl    12(fp)
                     60:        jneq    doit
                     61:        movl    $0,r1
                     62:        movl    4(fp),r0
                     63:        ret
                     64: doit:
                     65:        lnd     12(fp)  # note: -(0) = 0 by definition!
                     66:        pushl   20(fp)  # hfs
                     67:        pushd   
                     68:        pushl   8(fp)
                     69:        pushl   4(fp)   # acc
                     70:        callf   $24,_Kaddf
                     71:        ret

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