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Annotation of sys/arch/m68k/fpsp/MONADIC.CI5, Revision 1.1

1.1     ! nbrk        1: *      $OpenBSD: MONADIC.CI5,v 1.2 1996/05/29 21:05:21 niklas Exp $
        !             2: *      $NetBSD: MONADIC.CI5,v 1.2 1994/10/26 07:48:39 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.CI5 1.3 4/30/91
        !            36: *
        !            37: *      MONADIC.CI5 --- MONADIC template for CI5 compiler
        !            38: *
        !            39:
        !            40:        xref    tag
        !            41:        xref    _OPr_
        !            42:        xref    _OPz_
        !            43:        xref    _OPi_
        !            44:        xref    _OPn_
        !            45:        xref    _OPm_
        !            46:
        !            47:
        !            48:        xdef    _OPd_
        !            49: _OPd_:
        !            50:        link    a6,#-LOCAL_SIZE
        !            51:        fmovem.x fp2-fp3,USER_FP2(a6)
        !            52:        fmove.l fpsr,USER_FPSR(a6)
        !            53:        fmove.l fpcr,d1         ; user's rounding mode/precision
        !            54:        fmove.l #0,fpcr         ; force rounding mode/prec to extended,rn
        !            55: *
        !            56: *      copy, convert and tag input argument
        !            57: *
        !            58:        fmove.d 8(a6),fp0
        !            59:        fmove.x fp0,ETEMP(a6)
        !            60:        lea     ETEMP(a6),a0
        !            61:        bsr     tag
        !            62:        move.b  d0,STAG(a6)
        !            63:        tst.b   d0
        !            64:        bne.b   _TMP_2
        !            65:        bsr     _OPr_           ; normalized (regular) number
        !            66:        bra.b   _TMP_6
        !            67: _TMP_2:
        !            68:        cmp.b   #$20,d0         ; zero?
        !            69:        bne.b   _TMP_3
        !            70:        bsr     _OPz_
        !            71:        bra.b   _TMP_6
        !            72: _TMP_3:
        !            73:        cmp.b   #$40,d0         ; infinity?
        !            74:        bne.b   _TMP_4
        !            75:        bsr     _OPi_
        !            76:        bra.b   _TMP_6
        !            77: _TMP_4:
        !            78:        cmp.b   #$60,d0         ; NaN?
        !            79:        bne.b   _TMP_5
        !            80:        bsr     _OPn_
        !            81:        bra.b   _TMP_6
        !            82: _TMP_5:
        !            83:        bsr     _OPm_           ; assuming a denorm...
        !            84:
        !            85: _TMP_6:
        !            86:        fmove.l fpsr,d0         ; update status register
        !            87:        or.b    USER_FPSR+3(a6),d0      ;add previously accrued exceptions
        !            88:        move.l  d0,USER_FPSR(a6)
        !            89: *
        !            90: *      Result is now in FP0
        !            91: *
        !            92:        fmovem.x USER_FP2(a6),fp2-fp3   ; note: FP1 not restored
        !            93:        unlk    a6
        !            94:        rts