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:
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