usr/src/sys/tahoe/math/Kexpf.s

/*-
 * Copyright (c) 1985 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Computer Consoles Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)Kexpf.s     7.1 (Berkeley) 12/6/90
 */

#include "../tahoe/SYS.h"

        .text
ENTRY(Kexpf, R4|R3)
        subl3   $88,fp,sp
        tstl    4(fp)
        jneq    1f
        movl    one,r0
        ret
1:
        lnd     _maxf
        cmpd    4(fp)
        jleq    1f
        clrl    r0
        ret
1:
        cmpd2   4(fp),_maxf
        jleq    1f
        ldd     _HUGE
        cvdf
        stf     r0
        ret
1:
        pushl   20(fp)          # hfs
        ldd     _log2e; pushd
        ldd     4(fp); pushd
        callf   $24,_Kmuld
        ldd     r0
        std     4(fp)

        pushl   20(fp)          # hfs
        pushl   8(fp)
        pushl   4(fp)
        callf   $16,_Kfloorf
        movl    r0,-88(fp)      # (int)ent from Kfloorf

        cvlf    -88(fp)
        clrl    r1
        stf     r0
        pushl   20(fp)          # hfs
        pushl   r1
        pushl   r0
        ldd     4(fp); pushd
        callf   $24,_Ksubd      # (arg - ent)

        pushl   20(fp)          # hfs
        ldd     half; pushd
        ldd     r0; pushd
        callf   $24,_Ksubd
        ldd     r0; std -60(fp) # fract

        pushl   20(fp)          # hfs
        pushd
        pushd
        callf   $24,_Kmuld
        ldd     r0; std -84(fp) # xsq

        pushl   20(fp)          # hfs
        pushd                   # xsq
        ldd     _p2; pushd
        callf   $24,_Kmuld

        pushl   20(fp)          # hfs
        ldd     _p1; pushd
        ldd     r0; pushd
        callf   $24,_Kaddd

        pushl   20(fp)          # hfs
        ldd     -84(fp); pushd
        ldd     r0; pushd
        callf   $24,_Kmuld

        pushl   20(fp)          # hfs
        ldd     _p0; pushd
        ldd     r0; pushd
        callf   $24,_Kaddd

        pushl   20(fp)          # hfs
        ldd     -60(fp); pushd  # fract
        ldd     r0; pushd
        callf   $24,_Kmuld
        ldd     r0; std -68(fp) # temp1

        pushl   20(fp)          # hfs
        ldd     -84(fp); pushd  # xsq
        ldd     _q2; pushd
        callf   $24,_Kmuld

        pushl   20(fp)          # hfs
        ldd     _q1; pushd
        ldd     r0; pushd
        callf   $24,_Kaddd

        pushl   20(fp)          # hfs
        ldd     -84(fp); pushd
        ldd     r0; pushd
        callf   $24,_Kmuld

        pushl   20(fp)          # hfs
        ldd     _q0; pushd
        ldd     r0; pushd
        callf   $24,_Kaddd
        ldd     r0; std -76(fp) # temp2

        pushl   20(fp)          # hfs for Kldexpf
        pushl   -88(fp)         # ent

        pushl   20(fp)          # hfs tor temp2+temp1
        ldd     -68(fp); pushd  # temp1
        ldd     -76(fp); pushd  # temp2
        callf   $24,_Kaddd

        pushl   20(fp)          # hfs
        ldd     _sqrt2; pushd
        ldd     r0; pushd       # temp2+temp1
        callf   $24,_Kmuld
        ldd     r0; std r2              # sqrt2*(temp2+temp1)

        pushl   20(fp)          # hfs
        ldd     -68(fp)
        pushd
        ldd     -76(fp)
        pushd
        callf   $24,_Ksubd      # temp2-temp1

        pushl   20(fp)          # hfs
        ldd     r0
        pushd                   # temp2-temp1
        ldd     r2
        pushd
        callf   $24,_Kdivd

        ldd     r0
        pushd
        callf   $20,_Kldexpf

        #pushl  20(fp)          # hfs
        #pushl  $0
        #pushl  r0              # cvlf  r0
        #pushl  $0
        #pushl  $0
        #callf  $24,_Kcvtld

        #ldd    r0
        #cvdf
        #stf    r0
        ret

/* file : Kfloorf.x
*/
        .text
        .globl  _Kfloorf
        .data
        .align  2
L19:    .long   0x40800000, 0x00000000 # .double 1
        .text
        .set    L13,0x0
        .data
        .text
_Kfloorf:
        .word   L13
        subl3   $60,fp,sp
        tstl    4(fp)           # if (d<0.0) {
        jgeq    L17
        lnd     4(fp)
        std     4(fp)           # d = -d;
        pushl   12(fp)          # hfs
        addl3   $4,fp,-(sp)     # &d
        pushl   8(fp)
        pushl   4(fp)
        callf   $20,_Kmodf
        clrl    -60+4(fp)
        movl    r0,-60(fp)      # fract = modf(d,&d);
        tstl    r0              # if (fract != 0.0)
        jeql    L18
        pushl   12(fp)          # hfs
        ldd     L19
        pushd
        ldd     4(fp)
        pushd
        callf   $24,_Kaddd
        ldd     r0
        std     4(fp)           # d +=1;
L18:    lnd     4(fp)
        std     4(fp)           # d = -d;
        jbr     L20
L17:
        pushl   12(fp)          # hfs
        addl3   $4,fp,-(sp)
        pushl   8(fp)
        pushl   4(fp)
        callf   $20,_Kmodf
L20:    ldd     4(fp)
        cvdl    r0              # for Kexpf call only!
        ret

        .data
_p0:    .long   0x45BD3D04, 0x7F734DBD # .double 1513.9067990543389
_p1:    .long   0x42A19DD4, 0x989F60DA # .double 20.202065651286927
_p2:    .long   0x3DBD2E42, 0xAB70BDA9 # .double .023093347753750233
_q0:    .long   0x468881B1, 0x7C3A6529 # .double 4368.2116627275583
_q1:    .long   0x44692F28, 0x7AE89541 # .double 233.18421142748162
_q2:    .long   0x40800000, 0x00000000 # .double 1
_log2e: .long   0x40B8AA3B, 0x295C17F0 # .double 1.4426950408889634
_sqrt2: .long   0x40B504F3, 0x33F9DE64 # .double 1.414213562373095
_maxf:  .long   0x471C4000, 0x00000000 # .double 10000
_HUGE:  .long   0x7FFFFFFE, 0xFFFFFFFC # .double 1.701411733192644e+38
one:    .long   0x40800000 # .float 1
half:   .long   0x40000000, 0x00000000 # .double .5