92 lines
2.6 KiB
Plaintext
92 lines
2.6 KiB
Plaintext
* $NetBSD: MONADIC.R3V6,v 1.2 1994/10/26 07:48:44 cgd Exp $
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* MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
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* M68000 Hi-Performance Microprocessor Division
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* M68040 Software Package
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*
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* M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
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* All rights reserved.
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*
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* THE SOFTWARE is provided on an "AS IS" basis and without warranty.
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* To the maximum extent permitted by applicable law,
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* MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
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* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
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* PARTICULAR PURPOSE and any warranty against infringement with
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* regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
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* and any accompanying written materials.
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*
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* To the maximum extent permitted by applicable law,
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* IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
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* (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
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* PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
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* OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
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* SOFTWARE. Motorola assumes no responsibility for the maintenance
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* and support of the SOFTWARE.
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*
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* You are hereby granted a copyright license to use, modify, and
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* distribute the SOFTWARE so long as this entire notice is retained
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* without alteration in any modified and/or redistributed versions,
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* and that such modified versions are clearly identified as such.
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* No licenses are granted by implication, estoppel or otherwise
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* under any patents or trademarks of Motorola, Inc.
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*
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* MONADIC.R3V6 1.3 4/30/91
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*
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* MONADIC.R3V6 --- MONADIC template for MCD R3V6 native C compiler
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*
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* The MCD compiler is old. It returns float and double values
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* as a double stored in d0/d1. There is no support for single or extended
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* precision operations. It's not clear whether the float registers
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* should be preserved, so for speed, they're not.
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*
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xref tag
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xref _OPr_
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xref _OPz_
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xref _OPi_
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xref _OPn_
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xref _OPm_
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xdef _OPd_
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_OPd_:
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link a6,#-LOCAL_SIZE
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fmove.l fpcr,d1 ; user's rounding mode/precision
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fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
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*
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* copy, convert and tag input argument
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*
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fmove.d 8(a6),fp0
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fmove.x fp0,ETEMP(a6)
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lea ETEMP(a6),a0
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bsr tag
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move.b d0,STAG(a6)
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tst.b d0
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bne.b _TMP_2
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bsr _OPr_ ; normalized (regular) number
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bra.b _TMP_6
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_TMP_2:
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cmp.b #$20,d0 ; zero?
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bne.b _TMP_3
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bsr _OPz_
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bra.b _TMP_6
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_TMP_3:
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cmp.b #$40,d0 ; infinity?
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bne.b _TMP_4
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bsr _OPi_
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bra.b _TMP_6
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_TMP_4:
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cmp.b #$60,d0 ; NaN?
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bne.b _TMP_5
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bsr _OPn_
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bra.b _TMP_6
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_TMP_5:
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bsr _OPm_ ; assuming a denorm...
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_TMP_6:
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fmove.d fp0,USER_D0(a6) ; result goes into d0/d1 pair
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movem.l USER_D0(a6),d0-d1
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unlk a6
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rts
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