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Annotation of sys/arch/m68k/fpsp/MONADIC.R3V6, Revision 1.1

1.1     ! nbrk        1: *      $OpenBSD: MONADIC.R3V6,v 1.2 1996/05/29 21:05:23 niklas Exp $
        !             2: *      $NetBSD: MONADIC.R3V6,v 1.2 1994/10/26 07:48:44 cgd Exp $
        !             3:
        !             4: *      MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
        !             5: *      M68000 Hi-Performance Microprocessor Division
        !             6: *      M68040 Software Package
        !             7: *
        !             8: *      M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
        !             9: *      All rights reserved.
        !            10: *
        !            11: *      THE SOFTWARE is provided on an "AS IS" basis and without warranty.
        !            12: *      To the maximum extent permitted by applicable law,
        !            13: *      MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
        !            14: *      INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
        !            15: *      PARTICULAR PURPOSE and any warranty against infringement with
        !            16: *      regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
        !            17: *      and any accompanying written materials.
        !            18: *
        !            19: *      To the maximum extent permitted by applicable law,
        !            20: *      IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
        !            21: *      (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
        !            22: *      PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
        !            23: *      OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
        !            24: *      SOFTWARE.  Motorola assumes no responsibility for the maintenance
        !            25: *      and support of the SOFTWARE.
        !            26: *
        !            27: *      You are hereby granted a copyright license to use, modify, and
        !            28: *      distribute the SOFTWARE so long as this entire notice is retained
        !            29: *      without alteration in any modified and/or redistributed versions,
        !            30: *      and that such modified versions are clearly identified as such.
        !            31: *      No licenses are granted by implication, estoppel or otherwise
        !            32: *      under any patents or trademarks of Motorola, Inc.
        !            33:
        !            34: *
        !            35: *      MONADIC.R3V6 1.3 4/30/91
        !            36: *
        !            37: *      MONADIC.R3V6 --- MONADIC template for MCD R3V6 native C compiler
        !            38: *
        !            39: *      The MCD compiler is old.  It returns float and double values
        !            40: *      as a double stored in d0/d1.  There is no support for single or extended
        !            41: *      precision operations.  It's not clear whether the float registers
        !            42: *      should be preserved, so for speed, they're not.
        !            43: *
        !            44:
        !            45:        xref    tag
        !            46:        xref    _OPr_
        !            47:        xref    _OPz_
        !            48:        xref    _OPi_
        !            49:        xref    _OPn_
        !            50:        xref    _OPm_
        !            51:
        !            52:        xdef    _OPd_
        !            53: _OPd_:
        !            54:        link    a6,#-LOCAL_SIZE
        !            55:        fmove.l fpcr,d1         ; user's rounding mode/precision
        !            56:        fmove.l #0,fpcr         ; force rounding mode/prec to extended,rn
        !            57: *
        !            58: *      copy, convert and tag input argument
        !            59: *
        !            60:        fmove.d 8(a6),fp0
        !            61:        fmove.x fp0,ETEMP(a6)
        !            62:        lea     ETEMP(a6),a0
        !            63:        bsr     tag
        !            64:        move.b  d0,STAG(a6)
        !            65:        tst.b   d0
        !            66:        bne.b   _TMP_2
        !            67:        bsr     _OPr_           ; normalized (regular) number
        !            68:        bra.b   _TMP_6
        !            69: _TMP_2:
        !            70:        cmp.b   #$20,d0         ; zero?
        !            71:        bne.b   _TMP_3
        !            72:        bsr     _OPz_
        !            73:        bra.b   _TMP_6
        !            74: _TMP_3:
        !            75:        cmp.b   #$40,d0         ; infinity?
        !            76:        bne.b   _TMP_4
        !            77:        bsr     _OPi_
        !            78:        bra.b   _TMP_6
        !            79: _TMP_4:
        !            80:        cmp.b   #$60,d0         ; NaN?
        !            81:        bne.b   _TMP_5
        !            82:        bsr     _OPn_
        !            83:        bra.b   _TMP_6
        !            84: _TMP_5:
        !            85:        bsr     _OPm_           ; assuming a denorm...
        !            86:
        !            87: _TMP_6:
        !            88:        fmove.d fp0,USER_D0(a6) ; result goes into d0/d1 pair
        !            89:        movem.l USER_D0(a6),d0-d1
        !            90:        unlk    a6
        !            91:        rts
        !            92: