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* $NetBSD: MONADIC.GEN,v 1.3 1994/10/26 07:48:42 cgd Exp $
* MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP
* M68000 Hi-Performance Microprocessor Division
* M68040 Software Package
*
* M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc.
* All rights reserved.
*
* THE SOFTWARE is provided on an "AS IS" basis and without warranty.
* To the maximum extent permitted by applicable law,
* MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED,
* INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
* PARTICULAR PURPOSE and any warranty against infringement with
* regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF)
* and any accompanying written materials.
*
* To the maximum extent permitted by applicable law,
* IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER
* (INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS
* PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR
* OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE
* SOFTWARE. Motorola assumes no responsibility for the maintenance
* and support of the SOFTWARE.
*
* You are hereby granted a copyright license to use, modify, and
* distribute the SOFTWARE so long as this entire notice is retained
* without alteration in any modified and/or redistributed versions,
* and that such modified versions are clearly identified as such.
* No licenses are granted by implication, estoppel or otherwise
* under any patents or trademarks of Motorola, Inc.
*
* MONADIC.GEN 1.5 5/18/92
*
* MONADIC.GEN 1.4 1/16/92
*
* MONADIC.GEN 1.3 4/30/91
*
* MONADIC.GEN --- generic MONADIC template
*
* This version saves all registers that will be used by the emulation
* routines and restores all but FP0 on exit. The FPSR is
* updated to reflect the result of the operation. Return value
* is placed in FP0 for single, double and extended results.
*
* The package subroutines expect the incoming FPCR to be zeroed
* since they need extended precision to work properly. The
* 'final' FPCR is expected in d1 so that the calculated result
* can be properly sized and rounded. Also, if the incoming FPCR
* has enabled any exceptions, the exception will be taken on the
* final fmovem in this template.
*
* Customizations:
* 1. Remove the movem.l at the entry and exit of
* each routine if your compiler treats those
* registers as scratch.
* 2. Likewise, don't save FP0/FP1 if they are scratch
* registers.
* 3. Delete handling of the fpsr if you only care about
* the result.
* 4. Some (most?) C compilers convert all float arguments
* to double, and provide no support at all for extended
* precision so remove the _OPs_ and _OPx_ entry points.
* 5. Move the result to d0/d1 if the compiler is that old.
*
xref tag
xref _OPr_
xref _OPz_
xref _OPi_
xref _OPn_
xref _OPm_
xdef _OPs_
_OPs_:
link a6,#-LOCAL_SIZE
movem.l d0-d1/a0-a1,USER_DA(a6)
fmovem.x fp0-fp3,USER_FP0(a6)
fmove.l fpsr,USER_FPSR(a6)
fmove.l fpcr,USER_FPCR(a6)
fmove.l fpcr,d1 ; user's rounding mode/precision
fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
*
* copy, convert and tag input argument
*
fmove.s 8(a6),fp0
fmove.x fp0,ETEMP(a6)
lea ETEMP(a6),a0
bsr tag
move.b d0,STAG(a6)
tst.b d0
bne.b _TMP_2
bsr _OPr_ ; normalized (regular) number
bra.b _TMP_6
_TMP_2:
cmp.b #$20,d0 ; zero?
bne.b _TMP_3
bsr _OPz_
bra.b _TMP_6
_TMP_3:
cmp.b #$40,d0 ; infinity?
bne.b _TMP_4
bsr _OPi_
bra.b _TMP_6
_TMP_4:
cmp.b #$60,d0 ; NaN?
bne.b _TMP_5
bsr _OPn_
bra.b _TMP_6
_TMP_5:
bsr _OPm_ ; assuming a denorm...
_TMP_6:
fmove.l fpsr,d0 ; update status register
or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
fmove.l d0,fpsr
*
* Result is now in FP0
*
movem.l USER_DA(a6),d0-d1/a0-a1
fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
fmove.l USER_FPCR(a6),fpcr ; fpcr restored
unlk a6
rts
xdef _OPd_
_OPd_:
link a6,#-LOCAL_SIZE
movem.l d0-d1/a0-a1,USER_DA(a6)
fmovem.x fp0-fp3,USER_FP0(a6)
fmove.l fpsr,USER_FPSR(a6)
fmove.l fpcr,USER_FPCR(a6)
fmove.l fpcr,d1 ; user's rounding mode/precision
fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
*
* copy, convert and tag input argument
*
fmove.d 8(a6),fp0
fmove.x fp0,ETEMP(a6)
lea ETEMP(a6),a0
bsr tag
move.b d0,STAG(a6)
tst.b d0
bne.b _TMP_7
bsr _OPr_ ; normalized (regular) number
bra.b _TMP_B
_TMP_7:
cmp.b #$20,d0 ; zero?
bne.b _TMP_8
bsr _OPz_
bra.b _TMP_B
_TMP_8:
cmp.b #$40,d0 ; infinity?
bne.b _TMP_9
bsr _OPi_
bra.b _TMP_B
_TMP_9:
cmp.b #$60,d0 ; NaN?
bne.b _TMP_A
bsr _OPn_
bra.b _TMP_B
_TMP_A:
bsr _OPm_ ; assuming a denorm...
_TMP_B:
fmove.l fpsr,d0 ; update status register
or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
fmove.l d0,fpsr
*
* Result is now in FP0
*
movem.l USER_DA(a6),d0-d1/a0-a1
fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
fmove.l USER_FPCR(a6),fpcr ; fpcr restored
unlk a6
rts
xdef _OPx_
_OPx_:
link a6,#-LOCAL_SIZE
movem.l d0-d1/a0-a1,USER_DA(a6)
fmovem.x fp0-fp3,USER_FP0(a6)
fmove.l fpsr,USER_FPSR(a6)
fmove.l fpcr,USER_FPCR(a6)
fmove.l fpcr,d1 ; user's rounding mode/precision
fmove.l #0,fpcr ; force rounding mode/prec to extended,rn
*
* copy, convert and tag input argument
*
fmove.x 8(a6),fp0
fmove.x fp0,ETEMP(a6)
lea ETEMP(a6),a0
bsr tag
move.b d0,STAG(a6)
tst.b d0
bne.b _TMP_C
bsr _OPr_ ; normalized (regular) number
bra.b _TMP_G
_TMP_C:
cmp.b #$20,d0 ; zero?
bne.b _TMP_D
bsr _OPz_
bra.b _TMP_G
_TMP_D:
cmp.b #$40,d0 ; infinity?
bne.b _TMP_E
bsr _OPi_
bra.b _TMP_G
_TMP_E:
cmp.b #$60,d0 ; NaN?
bne.b _TMP_F
bsr _OPn_
bra.b _TMP_G
_TMP_F:
bsr _OPm_ ; assuming a denorm...
_TMP_G:
fmove.l fpsr,d0 ; update status register
or.b FPSR_AEXCEPT(a6),d0 ;add previously accrued exceptions
fmove.l d0,fpsr
*
* Result is now in FP0
*
movem.l USER_DA(a6),d0-d1/a0-a1
fmovem.x USER_FP1(a6),fp1-fp3 ; note: FP0 not restored
fmove.l USER_FPCR(a6),fpcr ; fpcr restored
unlk a6
rts
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