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Annotation of sys/arch/m68k/fpsp/MONADIC.R3V6, Revision 1.1.1.1

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: