MONADIC.R3V6 revision 1.1
1 1.1 mycroft * MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP 2 1.1 mycroft * M68000 Hi-Performance Microprocessor Division 3 1.1 mycroft * M68040 Software Package 4 1.1 mycroft * 5 1.1 mycroft * M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc. 6 1.1 mycroft * All rights reserved. 7 1.1 mycroft * 8 1.1 mycroft * THE SOFTWARE is provided on an "AS IS" basis and without warranty. 9 1.1 mycroft * To the maximum extent permitted by applicable law, 10 1.1 mycroft * MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, 11 1.1 mycroft * INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A 12 1.1 mycroft * PARTICULAR PURPOSE and any warranty against infringement with 13 1.1 mycroft * regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF) 14 1.1 mycroft * and any accompanying written materials. 15 1.1 mycroft * 16 1.1 mycroft * To the maximum extent permitted by applicable law, 17 1.1 mycroft * IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER 18 1.1 mycroft * (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS 19 1.1 mycroft * PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR 20 1.1 mycroft * OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE 21 1.1 mycroft * SOFTWARE. Motorola assumes no responsibility for the maintenance 22 1.1 mycroft * and support of the SOFTWARE. 23 1.1 mycroft * 24 1.1 mycroft * You are hereby granted a copyright license to use, modify, and 25 1.1 mycroft * distribute the SOFTWARE so long as this entire notice is retained 26 1.1 mycroft * without alteration in any modified and/or redistributed versions, 27 1.1 mycroft * and that such modified versions are clearly identified as such. 28 1.1 mycroft * No licenses are granted by implication, estoppel or otherwise 29 1.1 mycroft * under any patents or trademarks of Motorola, Inc. 30 1.1 mycroft 31 1.1 mycroft * 32 1.1 mycroft * MONADIC.R3V6 1.3 4/30/91 33 1.1 mycroft * 34 1.1 mycroft * MONADIC.R3V6 --- MONADIC template for MCD R3V6 native C compiler 35 1.1 mycroft * 36 1.1 mycroft * The MCD compiler is old. It returns float and double values 37 1.1 mycroft * as a double stored in d0/d1. There is no support for single or extended 38 1.1 mycroft * precision operations. It's not clear whether the float registers 39 1.1 mycroft * should be preserved, so for speed, they're not. 40 1.1 mycroft * 41 1.1 mycroft 42 1.1 mycroft xref tag 43 1.1 mycroft xref _OPr_ 44 1.1 mycroft xref _OPz_ 45 1.1 mycroft xref _OPi_ 46 1.1 mycroft xref _OPn_ 47 1.1 mycroft xref _OPm_ 48 1.1 mycroft 49 1.1 mycroft xdef _OPd_ 50 1.1 mycroft _OPd_: 51 1.1 mycroft link a6,#-LOCAL_SIZE 52 1.1 mycroft fmove.l fpcr,d1 ; user's rounding mode/precision 53 1.1 mycroft fmove.l #0,fpcr ; force rounding mode/prec to extended,rn 54 1.1 mycroft * 55 1.1 mycroft * copy, convert and tag input argument 56 1.1 mycroft * 57 1.1 mycroft fmove.d 8(a6),fp0 58 1.1 mycroft fmove.x fp0,ETEMP(a6) 59 1.1 mycroft lea ETEMP(a6),a0 60 1.1 mycroft bsr tag 61 1.1 mycroft move.b d0,STAG(a6) 62 1.1 mycroft tst.b d0 63 1.1 mycroft bne.b _TMP_2 64 1.1 mycroft bsr _OPr_ ; normalized (regular) number 65 1.1 mycroft bra.b _TMP_6 66 1.1 mycroft _TMP_2: 67 1.1 mycroft cmp.b #$20,d0 ; zero? 68 1.1 mycroft bne.b _TMP_3 69 1.1 mycroft bsr _OPz_ 70 1.1 mycroft bra.b _TMP_6 71 1.1 mycroft _TMP_3: 72 1.1 mycroft cmp.b #$40,d0 ; infinity? 73 1.1 mycroft bne.b _TMP_4 74 1.1 mycroft bsr _OPi_ 75 1.1 mycroft bra.b _TMP_6 76 1.1 mycroft _TMP_4: 77 1.1 mycroft cmp.b #$60,d0 ; NaN? 78 1.1 mycroft bne.b _TMP_5 79 1.1 mycroft bsr _OPn_ 80 1.1 mycroft bra.b _TMP_6 81 1.1 mycroft _TMP_5: 82 1.1 mycroft bsr _OPm_ ; assuming a denorm... 83 1.1 mycroft 84 1.1 mycroft _TMP_6: 85 1.1 mycroft fmove.d fp0,USER_D0(a6) ; result goes into d0/d1 pair 86 1.1 mycroft movem.l USER_D0(a6),d0-d1 87 1.1 mycroft unlk a6 88 1.1 mycroft rts 89 1.1 mycroft 90
Indexes created Sun Nov 02 07:10:05 GMT 2025