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Annotation of Net2/arch/tahoe/math/kfrexpd.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:  *     @(#)Kfrexpd.s   7.1 (Berkeley) 12/6/90
                     37:  */
                     38: 
                     39: #include "../tahoe/SYS.h"
                     40: 
                     41:        .text
                     42: ENTRY(Kfrexpd, 0)
                     43:        subl3   $60,fp,sp
                     44:        clrl    -60(fp)
                     45:        clrl    -56(fp)
                     46:        tstl    4(fp)
                     47:        jgeq    1f
                     48:        lnd     4(fp)
                     49:        std     4(fp)
                     50:        movl    $1,-56(fp)
                     51: 1:
                     52:        cmpd2   4(fp),one
                     53:        jleq    1f
                     54: 2:
                     55:        cmpd2   4(fp),one
                     56:        jleq    3f
                     57:        addl2   $1,-60(fp)
                     58:        pushl   16(fp)          # hfs
                     59:        pushl   two+4           # ldd   2.0
                     60:        pushl   two
                     61:        pushl   8(fp)
                     62:        pushl   4(fp)           # acc
                     63:        callf   $24,_Kdivd
                     64:        ldd     r0
                     65:        std     4(fp)
                     66:        jbr     2b
                     67: 1:     cmpd2   4(fp),half
                     68:        jlss    2f
                     69:        jbr     3f
                     70: 0:
                     71:        subl2   $1,-60(fp)
                     72:        pushl   16(fp)          # hfs
                     73:        ldd     two; pushd      # 2.0
                     74:        ldd     4(fp); pushd    # acc
                     75:        callf   $24,_Kmuld
                     76:        ldd     r0
                     77:        std     4(fp)
                     78: 2:
                     79:        cmpd2   4(fp),half
                     80:        jlss    0b
                     81: 3:     movl    -60(fp),*12(fp)
                     82:        tstl    -56(fp)
                     83:        jeql    1f
                     84:        lnd     4(fp)
                     85:        std     4(fp)
                     86: 1:
                     87:        movl    8(fp),r1
                     88:        movl    4(fp),r0
                     89:        ret
                     90:        .data
                     91:        .align 2
                     92: one:   .long   0x40800000, 0x00000000 # .double 1
                     93: two:   .long   0x41000000, 0x00000000 # .double 2
                     94: half:  .long   0x40000000, 0x00000000 # .double 0.5

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