Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2039 insertions, 0 deletions

diff --git a/arch/m68k/fpsp040/res_func.S b/arch/m68k/fpsp040/res_func.S
new file mode 100644
index 000000000..d9cdf4383
--- /dev/null
+++ b/arch/m68k/fpsp040/res_func.S
@@ -0,0 +1,2039 @@
+|
+|	res_func.sa 3.9 7/29/91
+|
+| Normalizes denormalized numbers if necessary and updates the
+| stack frame.  The function is then restored back into the
+| machine and the 040 completes the operation.  This routine
+| is only used by the unsupported data type/format handler.
+| (Exception vector 55).
+|
+| For packed move out (fmove.p fpm,<ea>) the operation is
+| completed here; data is packed and moved to user memory.
+| The stack is restored to the 040 only in the case of a
+| reportable exception in the conversion.
+|
+|
+|		Copyright (C) Motorola, Inc. 1990
+|			All Rights Reserved
+|
+|       For details on the license for this file, please see the
+|       file, README, in this same directory.
+
+RES_FUNC:    |idnt    2,1 | Motorola 040 Floating Point Software Package
+
+	|section	8
+
+#include "fpsp.h"
+
+sp_bnds:	.short	0x3f81,0x407e
+		.short	0x3f6a,0x0000
+dp_bnds:	.short	0x3c01,0x43fe
+		.short	0x3bcd,0x0000
+
+	|xref	mem_write
+	|xref	bindec
+	|xref	get_fline
+	|xref	round
+	|xref	denorm
+	|xref	dest_ext
+	|xref	dest_dbl
+	|xref	dest_sgl
+	|xref	unf_sub
+	|xref	nrm_set
+	|xref	dnrm_lp
+	|xref	ovf_res
+	|xref	reg_dest
+	|xref	t_ovfl
+	|xref	t_unfl
+
+	.global	res_func
+	.global	p_move
+
+res_func:
+	clrb	DNRM_FLG(%a6)
+	clrb	RES_FLG(%a6)
+	clrb	CU_ONLY(%a6)
+	tstb	DY_MO_FLG(%a6)
+	beqs	monadic
+dyadic:
+	btstb	#7,DTAG(%a6)	|if dop = norm=000, zero=001,
+|				;inf=010 or nan=011
+	beqs	monadic		|then branch
+|				;else denorm
+| HANDLE DESTINATION DENORM HERE
+|				;set dtag to norm
+|				;write the tag & fpte15 to the fstack
+	leal	FPTEMP(%a6),%a0
+
+	bclrb	#sign_bit,LOCAL_EX(%a0)
+	sne	LOCAL_SGN(%a0)
+
+	bsr	nrm_set		|normalize number (exp will go negative)
+	bclrb	#sign_bit,LOCAL_EX(%a0) |get rid of false sign
+	bfclr	LOCAL_SGN(%a0){#0:#8}	|change back to IEEE ext format
+	beqs	dpos
+	bsetb	#sign_bit,LOCAL_EX(%a0)
+dpos:
+	bfclr	DTAG(%a6){#0:#4}	|set tag to normalized, FPTE15 = 0
+	bsetb	#4,DTAG(%a6)	|set FPTE15
+	orb	#0x0f,DNRM_FLG(%a6)
+monadic:
+	leal	ETEMP(%a6),%a0
+	btstb	#direction_bit,CMDREG1B(%a6)	|check direction
+	bne	opclass3			|it is a mv out
+|
+| At this point, only opclass 0 and 2 possible
+|
+	btstb	#7,STAG(%a6)	|if sop = norm=000, zero=001,
+|				;inf=010 or nan=011
+	bne	mon_dnrm	|else denorm
+	tstb	DY_MO_FLG(%a6)	|all cases of dyadic instructions would
+	bne	normal		|require normalization of denorm
+
+| At this point:
+|	monadic instructions:	fabs  = $18  fneg   = $1a  ftst   = $3a
+|				fmove = $00  fsmove = $40  fdmove = $44
+|				fsqrt = $05* fssqrt = $41  fdsqrt = $45
+|				(*fsqrt reencoded to $05)
+|
+	movew	CMDREG1B(%a6),%d0	|get command register
+	andil	#0x7f,%d0			|strip to only command word
+|
+| At this point, fabs, fneg, fsmove, fdmove, ftst, fsqrt, fssqrt, and
+| fdsqrt are possible.
+| For cases fabs, fneg, fsmove, and fdmove goto spos (do not normalize)
+| For cases fsqrt, fssqrt, and fdsqrt goto nrm_src (do normalize)
+|
+	btstl	#0,%d0
+	bne	normal			|weed out fsqrt instructions
+|
+| cu_norm handles fmove in instructions with normalized inputs.
+| The routine round is used to correctly round the input for the
+| destination precision and mode.
+|
+cu_norm:
+	st	CU_ONLY(%a6)		|set cu-only inst flag
+	movew	CMDREG1B(%a6),%d0
+	andib	#0x3b,%d0		|isolate bits to select inst
+	tstb	%d0
+	beql	cu_nmove	|if zero, it is an fmove
+	cmpib	#0x18,%d0
+	beql	cu_nabs		|if $18, it is fabs
+	cmpib	#0x1a,%d0
+	beql	cu_nneg		|if $1a, it is fneg
+|
+| Inst is ftst.  Check the source operand and set the cc's accordingly.
+| No write is done, so simply rts.
+|
+cu_ntst:
+	movew	LOCAL_EX(%a0),%d0
+	bclrl	#15,%d0
+	sne	LOCAL_SGN(%a0)
+	beqs	cu_ntpo
+	orl	#neg_mask,USER_FPSR(%a6) |set N
+cu_ntpo:
+	cmpiw	#0x7fff,%d0	|test for inf/nan
+	bnes	cu_ntcz
+	tstl	LOCAL_HI(%a0)
+	bnes	cu_ntn
+	tstl	LOCAL_LO(%a0)
+	bnes	cu_ntn
+	orl	#inf_mask,USER_FPSR(%a6)
+	rts
+cu_ntn:
+	orl	#nan_mask,USER_FPSR(%a6)
+	movel	ETEMP_EX(%a6),FPTEMP_EX(%a6)	|set up fptemp sign for
+|						;snan handler
+
+	rts
+cu_ntcz:
+	tstl	LOCAL_HI(%a0)
+	bnel	cu_ntsx
+	tstl	LOCAL_LO(%a0)
+	bnel	cu_ntsx
+	orl	#z_mask,USER_FPSR(%a6)
+cu_ntsx:
+	rts
+|
+| Inst is fabs.  Execute the absolute value function on the input.
+| Branch to the fmove code.  If the operand is NaN, do nothing.
+|
+cu_nabs:
+	moveb	STAG(%a6),%d0
+	btstl	#5,%d0			|test for NaN or zero
+	bne	wr_etemp		|if either, simply write it
+	bclrb	#7,LOCAL_EX(%a0)		|do abs
+	bras	cu_nmove		|fmove code will finish
+|
+| Inst is fneg.  Execute the negate value function on the input.
+| Fall though to the fmove code.  If the operand is NaN, do nothing.
+|
+cu_nneg:
+	moveb	STAG(%a6),%d0
+	btstl	#5,%d0			|test for NaN or zero
+	bne	wr_etemp		|if either, simply write it
+	bchgb	#7,LOCAL_EX(%a0)		|do neg
+|
+| Inst is fmove.  This code also handles all result writes.
+| If bit 2 is set, round is forced to double.  If it is clear,
+| and bit 6 is set, round is forced to single.  If both are clear,
+| the round precision is found in the fpcr.  If the rounding precision
+| is double or single, round the result before the write.
+|
+cu_nmove:
+	moveb	STAG(%a6),%d0
+	andib	#0xe0,%d0			|isolate stag bits
+	bne	wr_etemp		|if not norm, simply write it
+	btstb	#2,CMDREG1B+1(%a6)	|check for rd
+	bne	cu_nmrd
+	btstb	#6,CMDREG1B+1(%a6)	|check for rs
+	bne	cu_nmrs
+|
+| The move or operation is not with forced precision.  Test for
+| nan or inf as the input; if so, simply write it to FPn.  Use the
+| FPCR_MODE byte to get rounding on norms and zeros.
+|
+cu_nmnr:
+	bfextu	FPCR_MODE(%a6){#0:#2},%d0
+	tstb	%d0			|check for extended
+	beq	cu_wrexn		|if so, just write result
+	cmpib	#1,%d0			|check for single
+	beq	cu_nmrs			|fall through to double
+|
+| The move is fdmove or round precision is double.
+|
+cu_nmrd:
+	movel	#2,%d0			|set up the size for denorm
+	movew	LOCAL_EX(%a0),%d1		|compare exponent to double threshold
+	andw	#0x7fff,%d1
+	cmpw	#0x3c01,%d1
+	bls	cu_nunfl
+	bfextu	FPCR_MODE(%a6){#2:#2},%d1	|get rmode
+	orl	#0x00020000,%d1		|or in rprec (double)
+	clrl	%d0			|clear g,r,s for round
+	bclrb	#sign_bit,LOCAL_EX(%a0)	|convert to internal format
+	sne	LOCAL_SGN(%a0)
+	bsrl	round
+	bfclr	LOCAL_SGN(%a0){#0:#8}
+	beqs	cu_nmrdc
+	bsetb	#sign_bit,LOCAL_EX(%a0)
+cu_nmrdc:
+	movew	LOCAL_EX(%a0),%d1		|check for overflow
+	andw	#0x7fff,%d1
+	cmpw	#0x43ff,%d1
+	bge	cu_novfl		|take care of overflow case
+	bra	cu_wrexn
+|
+| The move is fsmove or round precision is single.
+|
+cu_nmrs:
+	movel	#1,%d0
+	movew	LOCAL_EX(%a0),%d1
+	andw	#0x7fff,%d1
+	cmpw	#0x3f81,%d1
+	bls	cu_nunfl
+	bfextu	FPCR_MODE(%a6){#2:#2},%d1
+	orl	#0x00010000,%d1
+	clrl	%d0
+	bclrb	#sign_bit,LOCAL_EX(%a0)
+	sne	LOCAL_SGN(%a0)
+	bsrl	round
+	bfclr	LOCAL_SGN(%a0){#0:#8}
+	beqs	cu_nmrsc
+	bsetb	#sign_bit,LOCAL_EX(%a0)
+cu_nmrsc:
+	movew	LOCAL_EX(%a0),%d1
+	andw	#0x7FFF,%d1
+	cmpw	#0x407f,%d1
+	blt	cu_wrexn
+|
+| The operand is above precision boundaries.  Use t_ovfl to
+| generate the correct value.
+|
+cu_novfl:
+	bsr	t_ovfl
+	bra	cu_wrexn
+|
+| The operand is below precision boundaries.  Use denorm to
+| generate the correct value.
+|
+cu_nunfl:
+	bclrb	#sign_bit,LOCAL_EX(%a0)
+	sne	LOCAL_SGN(%a0)
+	bsr	denorm
+	bfclr	LOCAL_SGN(%a0){#0:#8}	|change back to IEEE ext format
+	beqs	cu_nucont
+	bsetb	#sign_bit,LOCAL_EX(%a0)
+cu_nucont:
+	bfextu	FPCR_MODE(%a6){#2:#2},%d1
+	btstb	#2,CMDREG1B+1(%a6)	|check for rd
+	bne	inst_d
+	btstb	#6,CMDREG1B+1(%a6)	|check for rs
+	bne	inst_s
+	swap	%d1
+	moveb	FPCR_MODE(%a6),%d1
+	lsrb	#6,%d1
+	swap	%d1
+	bra	inst_sd
+inst_d:
+	orl	#0x00020000,%d1
+	bra	inst_sd
+inst_s:
+	orl	#0x00010000,%d1
+inst_sd:
+	bclrb	#sign_bit,LOCAL_EX(%a0)
+	sne	LOCAL_SGN(%a0)
+	bsrl	round
+	bfclr	LOCAL_SGN(%a0){#0:#8}
+	beqs	cu_nuflp
+	bsetb	#sign_bit,LOCAL_EX(%a0)
+cu_nuflp:
+	btstb	#inex2_bit,FPSR_EXCEPT(%a6)
+	beqs	cu_nuninx
+	orl	#aunfl_mask,USER_FPSR(%a6) |if the round was inex, set AUNFL
+cu_nuninx:
+	tstl	LOCAL_HI(%a0)		|test for zero
+	bnes	cu_nunzro
+	tstl	LOCAL_LO(%a0)
+	bnes	cu_nunzro
+|
+| The mantissa is zero from the denorm loop.  Check sign and rmode
+| to see if rounding should have occurred which would leave the lsb.
+|
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0		|isolate rmode
+	cmpil	#0x20,%d0
+	blts	cu_nzro
+	bnes	cu_nrp
+cu_nrm:
+	tstw	LOCAL_EX(%a0)	|if positive, set lsb
+	bges	cu_nzro
+	btstb	#7,FPCR_MODE(%a6) |check for double
+	beqs	cu_nincs
+	bras	cu_nincd
+cu_nrp:
+	tstw	LOCAL_EX(%a0)	|if positive, set lsb
+	blts	cu_nzro
+	btstb	#7,FPCR_MODE(%a6) |check for double
+	beqs	cu_nincs
+cu_nincd:
+	orl	#0x800,LOCAL_LO(%a0) |inc for double
+	bra	cu_nunzro
+cu_nincs:
+	orl	#0x100,LOCAL_HI(%a0) |inc for single
+	bra	cu_nunzro
+cu_nzro:
+	orl	#z_mask,USER_FPSR(%a6)
+	moveb	STAG(%a6),%d0
+	andib	#0xe0,%d0
+	cmpib	#0x40,%d0		|check if input was tagged zero
+	beqs	cu_numv
+cu_nunzro:
+	orl	#unfl_mask,USER_FPSR(%a6) |set unfl
+cu_numv:
+	movel	(%a0),ETEMP(%a6)
+	movel	4(%a0),ETEMP_HI(%a6)
+	movel	8(%a0),ETEMP_LO(%a6)
+|
+| Write the result to memory, setting the fpsr cc bits.  NaN and Inf
+| bypass cu_wrexn.
+|
+cu_wrexn:
+	tstw	LOCAL_EX(%a0)		|test for zero
+	beqs	cu_wrzero
+	cmpw	#0x8000,LOCAL_EX(%a0)	|test for zero
+	bnes	cu_wreon
+cu_wrzero:
+	orl	#z_mask,USER_FPSR(%a6)	|set Z bit
+cu_wreon:
+	tstw	LOCAL_EX(%a0)
+	bpl	wr_etemp
+	orl	#neg_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+
+|
+| HANDLE SOURCE DENORM HERE
+|
+|				;clear denorm stag to norm
+|				;write the new tag & ete15 to the fstack
+mon_dnrm:
+|
+| At this point, check for the cases in which normalizing the
+| denorm produces incorrect results.
+|
+	tstb	DY_MO_FLG(%a6)	|all cases of dyadic instructions would
+	bnes	nrm_src		|require normalization of denorm
+
+| At this point:
+|	monadic instructions:	fabs  = $18  fneg   = $1a  ftst   = $3a
+|				fmove = $00  fsmove = $40  fdmove = $44
+|				fsqrt = $05* fssqrt = $41  fdsqrt = $45
+|				(*fsqrt reencoded to $05)
+|
+	movew	CMDREG1B(%a6),%d0	|get command register
+	andil	#0x7f,%d0			|strip to only command word
+|
+| At this point, fabs, fneg, fsmove, fdmove, ftst, fsqrt, fssqrt, and
+| fdsqrt are possible.
+| For cases fabs, fneg, fsmove, and fdmove goto spos (do not normalize)
+| For cases fsqrt, fssqrt, and fdsqrt goto nrm_src (do normalize)
+|
+	btstl	#0,%d0
+	bnes	nrm_src		|weed out fsqrt instructions
+	st	CU_ONLY(%a6)	|set cu-only inst flag
+	bra	cu_dnrm		|fmove, fabs, fneg, ftst
+|				;cases go to cu_dnrm
+nrm_src:
+	bclrb	#sign_bit,LOCAL_EX(%a0)
+	sne	LOCAL_SGN(%a0)
+	bsr	nrm_set		|normalize number (exponent will go
+|				; negative)
+	bclrb	#sign_bit,LOCAL_EX(%a0) |get rid of false sign
+
+	bfclr	LOCAL_SGN(%a0){#0:#8}	|change back to IEEE ext format
+	beqs	spos
+	bsetb	#sign_bit,LOCAL_EX(%a0)
+spos:
+	bfclr	STAG(%a6){#0:#4}	|set tag to normalized, FPTE15 = 0
+	bsetb	#4,STAG(%a6)	|set ETE15
+	orb	#0xf0,DNRM_FLG(%a6)
+normal:
+	tstb	DNRM_FLG(%a6)	|check if any of the ops were denorms
+	bne	ck_wrap		|if so, check if it is a potential
+|				;wrap-around case
+fix_stk:
+	moveb	#0xfe,CU_SAVEPC(%a6)
+	bclrb	#E1,E_BYTE(%a6)
+
+	clrw	NMNEXC(%a6)
+
+	st	RES_FLG(%a6)	|indicate that a restore is needed
+	rts
+
+|
+| cu_dnrm handles all cu-only instructions (fmove, fabs, fneg, and
+| ftst) completely in software without an frestore to the 040.
+|
+cu_dnrm:
+	st	CU_ONLY(%a6)
+	movew	CMDREG1B(%a6),%d0
+	andib	#0x3b,%d0		|isolate bits to select inst
+	tstb	%d0
+	beql	cu_dmove	|if zero, it is an fmove
+	cmpib	#0x18,%d0
+	beql	cu_dabs		|if $18, it is fabs
+	cmpib	#0x1a,%d0
+	beql	cu_dneg		|if $1a, it is fneg
+|
+| Inst is ftst.  Check the source operand and set the cc's accordingly.
+| No write is done, so simply rts.
+|
+cu_dtst:
+	movew	LOCAL_EX(%a0),%d0
+	bclrl	#15,%d0
+	sne	LOCAL_SGN(%a0)
+	beqs	cu_dtpo
+	orl	#neg_mask,USER_FPSR(%a6) |set N
+cu_dtpo:
+	cmpiw	#0x7fff,%d0	|test for inf/nan
+	bnes	cu_dtcz
+	tstl	LOCAL_HI(%a0)
+	bnes	cu_dtn
+	tstl	LOCAL_LO(%a0)
+	bnes	cu_dtn
+	orl	#inf_mask,USER_FPSR(%a6)
+	rts
+cu_dtn:
+	orl	#nan_mask,USER_FPSR(%a6)
+	movel	ETEMP_EX(%a6),FPTEMP_EX(%a6)	|set up fptemp sign for
+|						;snan handler
+	rts
+cu_dtcz:
+	tstl	LOCAL_HI(%a0)
+	bnel	cu_dtsx
+	tstl	LOCAL_LO(%a0)
+	bnel	cu_dtsx
+	orl	#z_mask,USER_FPSR(%a6)
+cu_dtsx:
+	rts
+|
+| Inst is fabs.  Execute the absolute value function on the input.
+| Branch to the fmove code.
+|
+cu_dabs:
+	bclrb	#7,LOCAL_EX(%a0)		|do abs
+	bras	cu_dmove		|fmove code will finish
+|
+| Inst is fneg.  Execute the negate value function on the input.
+| Fall though to the fmove code.
+|
+cu_dneg:
+	bchgb	#7,LOCAL_EX(%a0)		|do neg
+|
+| Inst is fmove.  This code also handles all result writes.
+| If bit 2 is set, round is forced to double.  If it is clear,
+| and bit 6 is set, round is forced to single.  If both are clear,
+| the round precision is found in the fpcr.  If the rounding precision
+| is double or single, the result is zero, and the mode is checked
+| to determine if the lsb of the result should be set.
+|
+cu_dmove:
+	btstb	#2,CMDREG1B+1(%a6)	|check for rd
+	bne	cu_dmrd
+	btstb	#6,CMDREG1B+1(%a6)	|check for rs
+	bne	cu_dmrs
+|
+| The move or operation is not with forced precision.  Use the
+| FPCR_MODE byte to get rounding.
+|
+cu_dmnr:
+	bfextu	FPCR_MODE(%a6){#0:#2},%d0
+	tstb	%d0			|check for extended
+	beq	cu_wrexd		|if so, just write result
+	cmpib	#1,%d0			|check for single
+	beq	cu_dmrs			|fall through to double
+|
+| The move is fdmove or round precision is double.  Result is zero.
+| Check rmode for rp or rm and set lsb accordingly.
+|
+cu_dmrd:
+	bfextu	FPCR_MODE(%a6){#2:#2},%d1	|get rmode
+	tstw	LOCAL_EX(%a0)		|check sign
+	blts	cu_dmdn
+	cmpib	#3,%d1			|check for rp
+	bne	cu_dpd			|load double pos zero
+	bra	cu_dpdr			|load double pos zero w/lsb
+cu_dmdn:
+	cmpib	#2,%d1			|check for rm
+	bne	cu_dnd			|load double neg zero
+	bra	cu_dndr			|load double neg zero w/lsb
+|
+| The move is fsmove or round precision is single.  Result is zero.
+| Check for rp or rm and set lsb accordingly.
+|
+cu_dmrs:
+	bfextu	FPCR_MODE(%a6){#2:#2},%d1	|get rmode
+	tstw	LOCAL_EX(%a0)		|check sign
+	blts	cu_dmsn
+	cmpib	#3,%d1			|check for rp
+	bne	cu_spd			|load single pos zero
+	bra	cu_spdr			|load single pos zero w/lsb
+cu_dmsn:
+	cmpib	#2,%d1			|check for rm
+	bne	cu_snd			|load single neg zero
+	bra	cu_sndr			|load single neg zero w/lsb
+|
+| The precision is extended, so the result in etemp is correct.
+| Simply set unfl (not inex2 or aunfl) and write the result to
+| the correct fp register.
+cu_wrexd:
+	orl	#unfl_mask,USER_FPSR(%a6)
+	tstw	LOCAL_EX(%a0)
+	beq	wr_etemp
+	orl	#neg_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+|
+| These routines write +/- zero in double format.  The routines
+| cu_dpdr and cu_dndr set the double lsb.
+|
+cu_dpd:
+	movel	#0x3c010000,LOCAL_EX(%a0)	|force pos double zero
+	clrl	LOCAL_HI(%a0)
+	clrl	LOCAL_LO(%a0)
+	orl	#z_mask,USER_FPSR(%a6)
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+cu_dpdr:
+	movel	#0x3c010000,LOCAL_EX(%a0)	|force pos double zero
+	clrl	LOCAL_HI(%a0)
+	movel	#0x800,LOCAL_LO(%a0)	|with lsb set
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+cu_dnd:
+	movel	#0xbc010000,LOCAL_EX(%a0)	|force pos double zero
+	clrl	LOCAL_HI(%a0)
+	clrl	LOCAL_LO(%a0)
+	orl	#z_mask,USER_FPSR(%a6)
+	orl	#neg_mask,USER_FPSR(%a6)
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+cu_dndr:
+	movel	#0xbc010000,LOCAL_EX(%a0)	|force pos double zero
+	clrl	LOCAL_HI(%a0)
+	movel	#0x800,LOCAL_LO(%a0)	|with lsb set
+	orl	#neg_mask,USER_FPSR(%a6)
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+|
+| These routines write +/- zero in single format.  The routines
+| cu_dpdr and cu_dndr set the single lsb.
+|
+cu_spd:
+	movel	#0x3f810000,LOCAL_EX(%a0)	|force pos single zero
+	clrl	LOCAL_HI(%a0)
+	clrl	LOCAL_LO(%a0)
+	orl	#z_mask,USER_FPSR(%a6)
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+cu_spdr:
+	movel	#0x3f810000,LOCAL_EX(%a0)	|force pos single zero
+	movel	#0x100,LOCAL_HI(%a0)	|with lsb set
+	clrl	LOCAL_LO(%a0)
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+cu_snd:
+	movel	#0xbf810000,LOCAL_EX(%a0)	|force pos single zero
+	clrl	LOCAL_HI(%a0)
+	clrl	LOCAL_LO(%a0)
+	orl	#z_mask,USER_FPSR(%a6)
+	orl	#neg_mask,USER_FPSR(%a6)
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+cu_sndr:
+	movel	#0xbf810000,LOCAL_EX(%a0)	|force pos single zero
+	movel	#0x100,LOCAL_HI(%a0)	|with lsb set
+	clrl	LOCAL_LO(%a0)
+	orl	#neg_mask,USER_FPSR(%a6)
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	bra	wr_etemp
+
+|
+| This code checks for 16-bit overflow conditions on dyadic
+| operations which are not restorable into the floating-point
+| unit and must be completed in software.  Basically, this
+| condition exists with a very large norm and a denorm.  One
+| of the operands must be denormalized to enter this code.
+|
+| Flags used:
+|	DY_MO_FLG contains 0 for monadic op, $ff for dyadic
+|	DNRM_FLG contains $00 for neither op denormalized
+|	                  $0f for the destination op denormalized
+|	                  $f0 for the source op denormalized
+|	                  $ff for both ops denormalized
+|
+| The wrap-around condition occurs for add, sub, div, and cmp
+| when
+|
+|	abs(dest_exp - src_exp) >= $8000
+|
+| and for mul when
+|
+|	(dest_exp + src_exp) < $0
+|
+| we must process the operation here if this case is true.
+|
+| The rts following the frcfpn routine is the exit from res_func
+| for this condition.  The restore flag (RES_FLG) is left clear.
+| No frestore is done unless an exception is to be reported.
+|
+| For fadd:
+|	if(sign_of(dest) != sign_of(src))
+|		replace exponent of src with $3fff (keep sign)
+|		use fpu to perform dest+new_src (user's rmode and X)
+|		clr sticky
+|	else
+|		set sticky
+|	call round with user's precision and mode
+|	move result to fpn and wbtemp
+|
+| For fsub:
+|	if(sign_of(dest) == sign_of(src))
+|		replace exponent of src with $3fff (keep sign)
+|		use fpu to perform dest+new_src (user's rmode and X)
+|		clr sticky
+|	else
+|		set sticky
+|	call round with user's precision and mode
+|	move result to fpn and wbtemp
+|
+| For fdiv/fsgldiv:
+|	if(both operands are denorm)
+|		restore_to_fpu;
+|	if(dest is norm)
+|		force_ovf;
+|	else(dest is denorm)
+|		force_unf:
+|
+| For fcmp:
+|	if(dest is norm)
+|		N = sign_of(dest);
+|	else(dest is denorm)
+|		N = sign_of(src);
+|
+| For fmul:
+|	if(both operands are denorm)
+|		force_unf;
+|	if((dest_exp + src_exp) < 0)
+|		force_unf:
+|	else
+|		restore_to_fpu;
+|
+| local equates:
+	.set	addcode,0x22
+	.set	subcode,0x28
+	.set	mulcode,0x23
+	.set	divcode,0x20
+	.set	cmpcode,0x38
+ck_wrap:
+	| tstb	DY_MO_FLG(%a6)	;check for fsqrt
+	beq	fix_stk		|if zero, it is fsqrt
+	movew	CMDREG1B(%a6),%d0
+	andiw	#0x3b,%d0		|strip to command bits
+	cmpiw	#addcode,%d0
+	beq	wrap_add
+	cmpiw	#subcode,%d0
+	beq	wrap_sub
+	cmpiw	#mulcode,%d0
+	beq	wrap_mul
+	cmpiw	#cmpcode,%d0
+	beq	wrap_cmp
+|
+| Inst is fdiv.
+|
+wrap_div:
+	cmpb	#0xff,DNRM_FLG(%a6) |if both ops denorm,
+	beq	fix_stk		 |restore to fpu
+|
+| One of the ops is denormalized.  Test for wrap condition
+| and force the result.
+|
+	cmpb	#0x0f,DNRM_FLG(%a6) |check for dest denorm
+	bnes	div_srcd
+div_destd:
+	bsrl	ckinf_ns
+	bne	fix_stk
+	bfextu	ETEMP_EX(%a6){#1:#15},%d0	|get src exp (always pos)
+	bfexts	FPTEMP_EX(%a6){#1:#15},%d1	|get dest exp (always neg)
+	subl	%d1,%d0			|subtract dest from src
+	cmpl	#0x7fff,%d0
+	blt	fix_stk			|if less, not wrap case
+	clrb	WBTEMP_SGN(%a6)
+	movew	ETEMP_EX(%a6),%d0		|find the sign of the result
+	movew	FPTEMP_EX(%a6),%d1
+	eorw	%d1,%d0
+	andiw	#0x8000,%d0
+	beq	force_unf
+	st	WBTEMP_SGN(%a6)
+	bra	force_unf
+
+ckinf_ns:
+	moveb	STAG(%a6),%d0		|check source tag for inf or nan
+	bra	ck_in_com
+ckinf_nd:
+	moveb	DTAG(%a6),%d0		|check destination tag for inf or nan
+ck_in_com:
+	andib	#0x60,%d0			|isolate tag bits
+	cmpb	#0x40,%d0			|is it inf?
+	beq	nan_or_inf		|not wrap case
+	cmpb	#0x60,%d0			|is it nan?
+	beq	nan_or_inf		|yes, not wrap case?
+	cmpb	#0x20,%d0			|is it a zero?
+	beq	nan_or_inf		|yes
+	clrl	%d0
+	rts				|then ; it is either a zero of norm,
+|					;check wrap case
+nan_or_inf:
+	moveql	#-1,%d0
+	rts
+
+
+
+div_srcd:
+	bsrl	ckinf_nd
+	bne	fix_stk
+	bfextu	FPTEMP_EX(%a6){#1:#15},%d0	|get dest exp (always pos)
+	bfexts	ETEMP_EX(%a6){#1:#15},%d1	|get src exp (always neg)
+	subl	%d1,%d0			|subtract src from dest
+	cmpl	#0x8000,%d0
+	blt	fix_stk			|if less, not wrap case
+	clrb	WBTEMP_SGN(%a6)
+	movew	ETEMP_EX(%a6),%d0		|find the sign of the result
+	movew	FPTEMP_EX(%a6),%d1
+	eorw	%d1,%d0
+	andiw	#0x8000,%d0
+	beqs	force_ovf
+	st	WBTEMP_SGN(%a6)
+|
+| This code handles the case of the instruction resulting in
+| an overflow condition.
+|
+force_ovf:
+	bclrb	#E1,E_BYTE(%a6)
+	orl	#ovfl_inx_mask,USER_FPSR(%a6)
+	clrw	NMNEXC(%a6)
+	leal	WBTEMP(%a6),%a0		|point a0 to memory location
+	movew	CMDREG1B(%a6),%d0
+	btstl	#6,%d0			|test for forced precision
+	beqs	frcovf_fpcr
+	btstl	#2,%d0			|check for double
+	bnes	frcovf_dbl
+	movel	#0x1,%d0			|inst is forced single
+	bras	frcovf_rnd
+frcovf_dbl:
+	movel	#0x2,%d0			|inst is forced double
+	bras	frcovf_rnd
+frcovf_fpcr:
+	bfextu	FPCR_MODE(%a6){#0:#2},%d0	|inst not forced - use fpcr prec
+frcovf_rnd:
+
+| The 881/882 does not set inex2 for the following case, so the
+| line is commented out to be compatible with 881/882
+|	tst.b	%d0
+|	beq.b	frcovf_x
+|	or.l	#inex2_mask,USER_FPSR(%a6) ;if prec is s or d, set inex2
+
+|frcovf_x:
+	bsrl	ovf_res			|get correct result based on
+|					;round precision/mode.  This
+|					;sets FPSR_CC correctly
+|					;returns in external format
+	bfclr	WBTEMP_SGN(%a6){#0:#8}
+	beq	frcfpn
+	bsetb	#sign_bit,WBTEMP_EX(%a6)
+	bra	frcfpn
+|
+| Inst is fadd.
+|
+wrap_add:
+	cmpb	#0xff,DNRM_FLG(%a6) |if both ops denorm,
+	beq	fix_stk		 |restore to fpu
+|
+| One of the ops is denormalized.  Test for wrap condition
+| and complete the instruction.
+|
+	cmpb	#0x0f,DNRM_FLG(%a6) |check for dest denorm
+	bnes	add_srcd
+add_destd:
+	bsrl	ckinf_ns
+	bne	fix_stk
+	bfextu	ETEMP_EX(%a6){#1:#15},%d0	|get src exp (always pos)
+	bfexts	FPTEMP_EX(%a6){#1:#15},%d1	|get dest exp (always neg)
+	subl	%d1,%d0			|subtract dest from src
+	cmpl	#0x8000,%d0
+	blt	fix_stk			|if less, not wrap case
+	bra	add_wrap
+add_srcd:
+	bsrl	ckinf_nd
+	bne	fix_stk
+	bfextu	FPTEMP_EX(%a6){#1:#15},%d0	|get dest exp (always pos)
+	bfexts	ETEMP_EX(%a6){#1:#15},%d1	|get src exp (always neg)
+	subl	%d1,%d0			|subtract src from dest
+	cmpl	#0x8000,%d0
+	blt	fix_stk			|if less, not wrap case
+|
+| Check the signs of the operands.  If they are unlike, the fpu
+| can be used to add the norm and 1.0 with the sign of the
+| denorm and it will correctly generate the result in extended
+| precision.  We can then call round with no sticky and the result
+| will be correct for the user's rounding mode and precision.  If
+| the signs are the same, we call round with the sticky bit set
+| and the result will be correct for the user's rounding mode and
+| precision.
+|
+add_wrap:
+	movew	ETEMP_EX(%a6),%d0
+	movew	FPTEMP_EX(%a6),%d1
+	eorw	%d1,%d0
+	andiw	#0x8000,%d0
+	beq	add_same
+|
+| The signs are unlike.
+|
+	cmpb	#0x0f,DNRM_FLG(%a6) |is dest the denorm?
+	bnes	add_u_srcd
+	movew	FPTEMP_EX(%a6),%d0
+	andiw	#0x8000,%d0
+	orw	#0x3fff,%d0	|force the exponent to +/- 1
+	movew	%d0,FPTEMP_EX(%a6) |in the denorm
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0
+	fmovel	%d0,%fpcr		|set up users rmode and X
+	fmovex	ETEMP(%a6),%fp0
+	faddx	FPTEMP(%a6),%fp0
+	leal	WBTEMP(%a6),%a0	|point a0 to wbtemp in frame
+	fmovel	%fpsr,%d1
+	orl	%d1,USER_FPSR(%a6) |capture cc's and inex from fadd
+	fmovex	%fp0,WBTEMP(%a6)	|write result to memory
+	lsrl	#4,%d0		|put rmode in lower 2 bits
+	movel	USER_FPCR(%a6),%d1
+	andil	#0xc0,%d1
+	lsrl	#6,%d1		|put precision in upper word
+	swap	%d1
+	orl	%d0,%d1		|set up for round call
+	clrl	%d0		|force sticky to zero
+	bclrb	#sign_bit,WBTEMP_EX(%a6)
+	sne	WBTEMP_SGN(%a6)
+	bsrl	round		|round result to users rmode & prec
+	bfclr	WBTEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beq	frcfpnr
+	bsetb	#sign_bit,WBTEMP_EX(%a6)
+	bra	frcfpnr
+add_u_srcd:
+	movew	ETEMP_EX(%a6),%d0
+	andiw	#0x8000,%d0
+	orw	#0x3fff,%d0	|force the exponent to +/- 1
+	movew	%d0,ETEMP_EX(%a6) |in the denorm
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0
+	fmovel	%d0,%fpcr		|set up users rmode and X
+	fmovex	ETEMP(%a6),%fp0
+	faddx	FPTEMP(%a6),%fp0
+	fmovel	%fpsr,%d1
+	orl	%d1,USER_FPSR(%a6) |capture cc's and inex from fadd
+	leal	WBTEMP(%a6),%a0	|point a0 to wbtemp in frame
+	fmovex	%fp0,WBTEMP(%a6)	|write result to memory
+	lsrl	#4,%d0		|put rmode in lower 2 bits
+	movel	USER_FPCR(%a6),%d1
+	andil	#0xc0,%d1
+	lsrl	#6,%d1		|put precision in upper word
+	swap	%d1
+	orl	%d0,%d1		|set up for round call
+	clrl	%d0		|force sticky to zero
+	bclrb	#sign_bit,WBTEMP_EX(%a6)
+	sne	WBTEMP_SGN(%a6)	|use internal format for round
+	bsrl	round		|round result to users rmode & prec
+	bfclr	WBTEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beq	frcfpnr
+	bsetb	#sign_bit,WBTEMP_EX(%a6)
+	bra	frcfpnr
+|
+| Signs are alike:
+|
+add_same:
+	cmpb	#0x0f,DNRM_FLG(%a6) |is dest the denorm?
+	bnes	add_s_srcd
+add_s_destd:
+	leal	ETEMP(%a6),%a0
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0
+	lsrl	#4,%d0		|put rmode in lower 2 bits
+	movel	USER_FPCR(%a6),%d1
+	andil	#0xc0,%d1
+	lsrl	#6,%d1		|put precision in upper word
+	swap	%d1
+	orl	%d0,%d1		|set up for round call
+	movel	#0x20000000,%d0	|set sticky for round
+	bclrb	#sign_bit,ETEMP_EX(%a6)
+	sne	ETEMP_SGN(%a6)
+	bsrl	round		|round result to users rmode & prec
+	bfclr	ETEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beqs	add_s_dclr
+	bsetb	#sign_bit,ETEMP_EX(%a6)
+add_s_dclr:
+	leal	WBTEMP(%a6),%a0
+	movel	ETEMP(%a6),(%a0)	|write result to wbtemp
+	movel	ETEMP_HI(%a6),4(%a0)
+	movel	ETEMP_LO(%a6),8(%a0)
+	tstw	ETEMP_EX(%a6)
+	bgt	add_ckovf
+	orl	#neg_mask,USER_FPSR(%a6)
+	bra	add_ckovf
+add_s_srcd:
+	leal	FPTEMP(%a6),%a0
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0
+	lsrl	#4,%d0		|put rmode in lower 2 bits
+	movel	USER_FPCR(%a6),%d1
+	andil	#0xc0,%d1
+	lsrl	#6,%d1		|put precision in upper word
+	swap	%d1
+	orl	%d0,%d1		|set up for round call
+	movel	#0x20000000,%d0	|set sticky for round
+	bclrb	#sign_bit,FPTEMP_EX(%a6)
+	sne	FPTEMP_SGN(%a6)
+	bsrl	round		|round result to users rmode & prec
+	bfclr	FPTEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beqs	add_s_sclr
+	bsetb	#sign_bit,FPTEMP_EX(%a6)
+add_s_sclr:
+	leal	WBTEMP(%a6),%a0
+	movel	FPTEMP(%a6),(%a0)	|write result to wbtemp
+	movel	FPTEMP_HI(%a6),4(%a0)
+	movel	FPTEMP_LO(%a6),8(%a0)
+	tstw	FPTEMP_EX(%a6)
+	bgt	add_ckovf
+	orl	#neg_mask,USER_FPSR(%a6)
+add_ckovf:
+	movew	WBTEMP_EX(%a6),%d0
+	andiw	#0x7fff,%d0
+	cmpiw	#0x7fff,%d0
+	bne	frcfpnr
+|
+| The result has overflowed to $7fff exponent.  Set I, ovfl,
+| and aovfl, and clr the mantissa (incorrectly set by the
+| round routine.)
+|
+	orl	#inf_mask+ovfl_inx_mask,USER_FPSR(%a6)
+	clrl	4(%a0)
+	bra	frcfpnr
+|
+| Inst is fsub.
+|
+wrap_sub:
+	cmpb	#0xff,DNRM_FLG(%a6) |if both ops denorm,
+	beq	fix_stk		 |restore to fpu
+|
+| One of the ops is denormalized.  Test for wrap condition
+| and complete the instruction.
+|
+	cmpb	#0x0f,DNRM_FLG(%a6) |check for dest denorm
+	bnes	sub_srcd
+sub_destd:
+	bsrl	ckinf_ns
+	bne	fix_stk
+	bfextu	ETEMP_EX(%a6){#1:#15},%d0	|get src exp (always pos)
+	bfexts	FPTEMP_EX(%a6){#1:#15},%d1	|get dest exp (always neg)
+	subl	%d1,%d0			|subtract src from dest
+	cmpl	#0x8000,%d0
+	blt	fix_stk			|if less, not wrap case
+	bra	sub_wrap
+sub_srcd:
+	bsrl	ckinf_nd
+	bne	fix_stk
+	bfextu	FPTEMP_EX(%a6){#1:#15},%d0	|get dest exp (always pos)
+	bfexts	ETEMP_EX(%a6){#1:#15},%d1	|get src exp (always neg)
+	subl	%d1,%d0			|subtract dest from src
+	cmpl	#0x8000,%d0
+	blt	fix_stk			|if less, not wrap case
+|
+| Check the signs of the operands.  If they are alike, the fpu
+| can be used to subtract from the norm 1.0 with the sign of the
+| denorm and it will correctly generate the result in extended
+| precision.  We can then call round with no sticky and the result
+| will be correct for the user's rounding mode and precision.  If
+| the signs are unlike, we call round with the sticky bit set
+| and the result will be correct for the user's rounding mode and
+| precision.
+|
+sub_wrap:
+	movew	ETEMP_EX(%a6),%d0
+	movew	FPTEMP_EX(%a6),%d1
+	eorw	%d1,%d0
+	andiw	#0x8000,%d0
+	bne	sub_diff
+|
+| The signs are alike.
+|
+	cmpb	#0x0f,DNRM_FLG(%a6) |is dest the denorm?
+	bnes	sub_u_srcd
+	movew	FPTEMP_EX(%a6),%d0
+	andiw	#0x8000,%d0
+	orw	#0x3fff,%d0	|force the exponent to +/- 1
+	movew	%d0,FPTEMP_EX(%a6) |in the denorm
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0
+	fmovel	%d0,%fpcr		|set up users rmode and X
+	fmovex	FPTEMP(%a6),%fp0
+	fsubx	ETEMP(%a6),%fp0
+	fmovel	%fpsr,%d1
+	orl	%d1,USER_FPSR(%a6) |capture cc's and inex from fadd
+	leal	WBTEMP(%a6),%a0	|point a0 to wbtemp in frame
+	fmovex	%fp0,WBTEMP(%a6)	|write result to memory
+	lsrl	#4,%d0		|put rmode in lower 2 bits
+	movel	USER_FPCR(%a6),%d1
+	andil	#0xc0,%d1
+	lsrl	#6,%d1		|put precision in upper word
+	swap	%d1
+	orl	%d0,%d1		|set up for round call
+	clrl	%d0		|force sticky to zero
+	bclrb	#sign_bit,WBTEMP_EX(%a6)
+	sne	WBTEMP_SGN(%a6)
+	bsrl	round		|round result to users rmode & prec
+	bfclr	WBTEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beq	frcfpnr
+	bsetb	#sign_bit,WBTEMP_EX(%a6)
+	bra	frcfpnr
+sub_u_srcd:
+	movew	ETEMP_EX(%a6),%d0
+	andiw	#0x8000,%d0
+	orw	#0x3fff,%d0	|force the exponent to +/- 1
+	movew	%d0,ETEMP_EX(%a6) |in the denorm
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0
+	fmovel	%d0,%fpcr		|set up users rmode and X
+	fmovex	FPTEMP(%a6),%fp0
+	fsubx	ETEMP(%a6),%fp0
+	fmovel	%fpsr,%d1
+	orl	%d1,USER_FPSR(%a6) |capture cc's and inex from fadd
+	leal	WBTEMP(%a6),%a0	|point a0 to wbtemp in frame
+	fmovex	%fp0,WBTEMP(%a6)	|write result to memory
+	lsrl	#4,%d0		|put rmode in lower 2 bits
+	movel	USER_FPCR(%a6),%d1
+	andil	#0xc0,%d1
+	lsrl	#6,%d1		|put precision in upper word
+	swap	%d1
+	orl	%d0,%d1		|set up for round call
+	clrl	%d0		|force sticky to zero
+	bclrb	#sign_bit,WBTEMP_EX(%a6)
+	sne	WBTEMP_SGN(%a6)
+	bsrl	round		|round result to users rmode & prec
+	bfclr	WBTEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beq	frcfpnr
+	bsetb	#sign_bit,WBTEMP_EX(%a6)
+	bra	frcfpnr
+|
+| Signs are unlike:
+|
+sub_diff:
+	cmpb	#0x0f,DNRM_FLG(%a6) |is dest the denorm?
+	bnes	sub_s_srcd
+sub_s_destd:
+	leal	ETEMP(%a6),%a0
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0
+	lsrl	#4,%d0		|put rmode in lower 2 bits
+	movel	USER_FPCR(%a6),%d1
+	andil	#0xc0,%d1
+	lsrl	#6,%d1		|put precision in upper word
+	swap	%d1
+	orl	%d0,%d1		|set up for round call
+	movel	#0x20000000,%d0	|set sticky for round
+|
+| Since the dest is the denorm, the sign is the opposite of the
+| norm sign.
+|
+	eoriw	#0x8000,ETEMP_EX(%a6)	|flip sign on result
+	tstw	ETEMP_EX(%a6)
+	bgts	sub_s_dwr
+	orl	#neg_mask,USER_FPSR(%a6)
+sub_s_dwr:
+	bclrb	#sign_bit,ETEMP_EX(%a6)
+	sne	ETEMP_SGN(%a6)
+	bsrl	round		|round result to users rmode & prec
+	bfclr	ETEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beqs	sub_s_dclr
+	bsetb	#sign_bit,ETEMP_EX(%a6)
+sub_s_dclr:
+	leal	WBTEMP(%a6),%a0
+	movel	ETEMP(%a6),(%a0)	|write result to wbtemp
+	movel	ETEMP_HI(%a6),4(%a0)
+	movel	ETEMP_LO(%a6),8(%a0)
+	bra	sub_ckovf
+sub_s_srcd:
+	leal	FPTEMP(%a6),%a0
+	movel	USER_FPCR(%a6),%d0
+	andil	#0x30,%d0
+	lsrl	#4,%d0		|put rmode in lower 2 bits
+	movel	USER_FPCR(%a6),%d1
+	andil	#0xc0,%d1
+	lsrl	#6,%d1		|put precision in upper word
+	swap	%d1
+	orl	%d0,%d1		|set up for round call
+	movel	#0x20000000,%d0	|set sticky for round
+	bclrb	#sign_bit,FPTEMP_EX(%a6)
+	sne	FPTEMP_SGN(%a6)
+	bsrl	round		|round result to users rmode & prec
+	bfclr	FPTEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beqs	sub_s_sclr
+	bsetb	#sign_bit,FPTEMP_EX(%a6)
+sub_s_sclr:
+	leal	WBTEMP(%a6),%a0
+	movel	FPTEMP(%a6),(%a0)	|write result to wbtemp
+	movel	FPTEMP_HI(%a6),4(%a0)
+	movel	FPTEMP_LO(%a6),8(%a0)
+	tstw	FPTEMP_EX(%a6)
+	bgt	sub_ckovf
+	orl	#neg_mask,USER_FPSR(%a6)
+sub_ckovf:
+	movew	WBTEMP_EX(%a6),%d0
+	andiw	#0x7fff,%d0
+	cmpiw	#0x7fff,%d0
+	bne	frcfpnr
+|
+| The result has overflowed to $7fff exponent.  Set I, ovfl,
+| and aovfl, and clr the mantissa (incorrectly set by the
+| round routine.)
+|
+	orl	#inf_mask+ovfl_inx_mask,USER_FPSR(%a6)
+	clrl	4(%a0)
+	bra	frcfpnr
+|
+| Inst is fcmp.
+|
+wrap_cmp:
+	cmpb	#0xff,DNRM_FLG(%a6) |if both ops denorm,
+	beq	fix_stk		 |restore to fpu
+|
+| One of the ops is denormalized.  Test for wrap condition
+| and complete the instruction.
+|
+	cmpb	#0x0f,DNRM_FLG(%a6) |check for dest denorm
+	bnes	cmp_srcd
+cmp_destd:
+	bsrl	ckinf_ns
+	bne	fix_stk
+	bfextu	ETEMP_EX(%a6){#1:#15},%d0	|get src exp (always pos)
+	bfexts	FPTEMP_EX(%a6){#1:#15},%d1	|get dest exp (always neg)
+	subl	%d1,%d0			|subtract dest from src
+	cmpl	#0x8000,%d0
+	blt	fix_stk			|if less, not wrap case
+	tstw	ETEMP_EX(%a6)		|set N to ~sign_of(src)
+	bge	cmp_setn
+	rts
+cmp_srcd:
+	bsrl	ckinf_nd
+	bne	fix_stk
+	bfextu	FPTEMP_EX(%a6){#1:#15},%d0	|get dest exp (always pos)
+	bfexts	ETEMP_EX(%a6){#1:#15},%d1	|get src exp (always neg)
+	subl	%d1,%d0			|subtract src from dest
+	cmpl	#0x8000,%d0
+	blt	fix_stk			|if less, not wrap case
+	tstw	FPTEMP_EX(%a6)		|set N to sign_of(dest)
+	blt	cmp_setn
+	rts
+cmp_setn:
+	orl	#neg_mask,USER_FPSR(%a6)
+	rts
+
+|
+| Inst is fmul.
+|
+wrap_mul:
+	cmpb	#0xff,DNRM_FLG(%a6) |if both ops denorm,
+	beq	force_unf	|force an underflow (really!)
+|
+| One of the ops is denormalized.  Test for wrap condition
+| and complete the instruction.
+|
+	cmpb	#0x0f,DNRM_FLG(%a6) |check for dest denorm
+	bnes	mul_srcd
+mul_destd:
+	bsrl	ckinf_ns
+	bne	fix_stk
+	bfextu	ETEMP_EX(%a6){#1:#15},%d0	|get src exp (always pos)
+	bfexts	FPTEMP_EX(%a6){#1:#15},%d1	|get dest exp (always neg)
+	addl	%d1,%d0			|subtract dest from src
+	bgt	fix_stk
+	bra	force_unf
+mul_srcd:
+	bsrl	ckinf_nd
+	bne	fix_stk
+	bfextu	FPTEMP_EX(%a6){#1:#15},%d0	|get dest exp (always pos)
+	bfexts	ETEMP_EX(%a6){#1:#15},%d1	|get src exp (always neg)
+	addl	%d1,%d0			|subtract src from dest
+	bgt	fix_stk
+
+|
+| This code handles the case of the instruction resulting in
+| an underflow condition.
+|
+force_unf:
+	bclrb	#E1,E_BYTE(%a6)
+	orl	#unfinx_mask,USER_FPSR(%a6)
+	clrw	NMNEXC(%a6)
+	clrb	WBTEMP_SGN(%a6)
+	movew	ETEMP_EX(%a6),%d0		|find the sign of the result
+	movew	FPTEMP_EX(%a6),%d1
+	eorw	%d1,%d0
+	andiw	#0x8000,%d0
+	beqs	frcunfcont
+	st	WBTEMP_SGN(%a6)
+frcunfcont:
+	lea	WBTEMP(%a6),%a0		|point a0 to memory location
+	movew	CMDREG1B(%a6),%d0
+	btstl	#6,%d0			|test for forced precision
+	beqs	frcunf_fpcr
+	btstl	#2,%d0			|check for double
+	bnes	frcunf_dbl
+	movel	#0x1,%d0			|inst is forced single
+	bras	frcunf_rnd
+frcunf_dbl:
+	movel	#0x2,%d0			|inst is forced double
+	bras	frcunf_rnd
+frcunf_fpcr:
+	bfextu	FPCR_MODE(%a6){#0:#2},%d0	|inst not forced - use fpcr prec
+frcunf_rnd:
+	bsrl	unf_sub			|get correct result based on
+|					;round precision/mode.  This
+|					;sets FPSR_CC correctly
+	bfclr	WBTEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beqs	frcfpn
+	bsetb	#sign_bit,WBTEMP_EX(%a6)
+	bra	frcfpn
+
+|
+| Write the result to the user's fpn.  All results must be HUGE to be
+| written; otherwise the results would have overflowed or underflowed.
+| If the rounding precision is single or double, the ovf_res routine
+| is needed to correctly supply the max value.
+|
+frcfpnr:
+	movew	CMDREG1B(%a6),%d0
+	btstl	#6,%d0			|test for forced precision
+	beqs	frcfpn_fpcr
+	btstl	#2,%d0			|check for double
+	bnes	frcfpn_dbl
+	movel	#0x1,%d0			|inst is forced single
+	bras	frcfpn_rnd
+frcfpn_dbl:
+	movel	#0x2,%d0			|inst is forced double
+	bras	frcfpn_rnd
+frcfpn_fpcr:
+	bfextu	FPCR_MODE(%a6){#0:#2},%d0	|inst not forced - use fpcr prec
+	tstb	%d0
+	beqs	frcfpn			|if extended, write what you got
+frcfpn_rnd:
+	bclrb	#sign_bit,WBTEMP_EX(%a6)
+	sne	WBTEMP_SGN(%a6)
+	bsrl	ovf_res			|get correct result based on
+|					;round precision/mode.  This
+|					;sets FPSR_CC correctly
+	bfclr	WBTEMP_SGN(%a6){#0:#8}	|convert back to IEEE ext format
+	beqs	frcfpn_clr
+	bsetb	#sign_bit,WBTEMP_EX(%a6)
+frcfpn_clr:
+	orl	#ovfinx_mask,USER_FPSR(%a6)
+|
+| Perform the write.
+|
+frcfpn:
+	bfextu	CMDREG1B(%a6){#6:#3},%d0	|extract fp destination register
+	cmpib	#3,%d0
+	bles	frc0123			|check if dest is fp0-fp3
+	movel	#7,%d1
+	subl	%d0,%d1
+	clrl	%d0
+	bsetl	%d1,%d0
+	fmovemx WBTEMP(%a6),%d0
+	rts
+frc0123:
+	cmpib	#0,%d0
+	beqs	frc0_dst
+	cmpib	#1,%d0
+	beqs	frc1_dst
+	cmpib	#2,%d0
+	beqs	frc2_dst
+frc3_dst:
+	movel	WBTEMP_EX(%a6),USER_FP3(%a6)
+	movel	WBTEMP_HI(%a6),USER_FP3+4(%a6)
+	movel	WBTEMP_LO(%a6),USER_FP3+8(%a6)
+	rts
+frc2_dst:
+	movel	WBTEMP_EX(%a6),USER_FP2(%a6)
+	movel	WBTEMP_HI(%a6),USER_FP2+4(%a6)
+	movel	WBTEMP_LO(%a6),USER_FP2+8(%a6)
+	rts
+frc1_dst:
+	movel	WBTEMP_EX(%a6),USER_FP1(%a6)
+	movel	WBTEMP_HI(%a6),USER_FP1+4(%a6)
+	movel	WBTEMP_LO(%a6),USER_FP1+8(%a6)
+	rts
+frc0_dst:
+	movel	WBTEMP_EX(%a6),USER_FP0(%a6)
+	movel	WBTEMP_HI(%a6),USER_FP0+4(%a6)
+	movel	WBTEMP_LO(%a6),USER_FP0+8(%a6)
+	rts
+
+|
+| Write etemp to fpn.
+| A check is made on enabled and signalled snan exceptions,
+| and the destination is not overwritten if this condition exists.
+| This code is designed to make fmoveins of unsupported data types
+| faster.
+|
+wr_etemp:
+	btstb	#snan_bit,FPSR_EXCEPT(%a6)	|if snan is set, and
+	beqs	fmoveinc		|enabled, force restore
+	btstb	#snan_bit,FPCR_ENABLE(%a6) |and don't overwrite
+	beqs	fmoveinc		|the dest
+	movel	ETEMP_EX(%a6),FPTEMP_EX(%a6)	|set up fptemp sign for
+|						;snan handler
+	tstb	ETEMP(%a6)		|check for negative
+	blts	snan_neg
+	rts
+snan_neg:
+	orl	#neg_bit,USER_FPSR(%a6)	|snan is negative; set N
+	rts
+fmoveinc:
+	clrw	NMNEXC(%a6)
+	bclrb	#E1,E_BYTE(%a6)
+	moveb	STAG(%a6),%d0		|check if stag is inf
+	andib	#0xe0,%d0
+	cmpib	#0x40,%d0
+	bnes	fminc_cnan
+	orl	#inf_mask,USER_FPSR(%a6) |if inf, nothing yet has set I
+	tstw	LOCAL_EX(%a0)		|check sign
+	bges	fminc_con
+	orl	#neg_mask,USER_FPSR(%a6)
+	bra	fminc_con
+fminc_cnan:
+	cmpib	#0x60,%d0			|check if stag is NaN
+	bnes	fminc_czero
+	orl	#nan_mask,USER_FPSR(%a6) |if nan, nothing yet has set NaN
+	movel	ETEMP_EX(%a6),FPTEMP_EX(%a6)	|set up fptemp sign for
+|						;snan handler
+	tstw	LOCAL_EX(%a0)		|check sign
+	bges	fminc_con
+	orl	#neg_mask,USER_FPSR(%a6)
+	bra	fminc_con
+fminc_czero:
+	cmpib	#0x20,%d0			|check if zero
+	bnes	fminc_con
+	orl	#z_mask,USER_FPSR(%a6)	|if zero, set Z
+	tstw	LOCAL_EX(%a0)		|check sign
+	bges	fminc_con
+	orl	#neg_mask,USER_FPSR(%a6)
+fminc_con:
+	bfextu	CMDREG1B(%a6){#6:#3},%d0	|extract fp destination register
+	cmpib	#3,%d0
+	bles	fp0123			|check if dest is fp0-fp3
+	movel	#7,%d1
+	subl	%d0,%d1
+	clrl	%d0
+	bsetl	%d1,%d0
+	fmovemx ETEMP(%a6),%d0
+	rts
+
+fp0123:
+	cmpib	#0,%d0
+	beqs	fp0_dst
+	cmpib	#1,%d0
+	beqs	fp1_dst
+	cmpib	#2,%d0
+	beqs	fp2_dst
+fp3_dst:
+	movel	ETEMP_EX(%a6),USER_FP3(%a6)
+	movel	ETEMP_HI(%a6),USER_FP3+4(%a6)
+	movel	ETEMP_LO(%a6),USER_FP3+8(%a6)
+	rts
+fp2_dst:
+	movel	ETEMP_EX(%a6),USER_FP2(%a6)
+	movel	ETEMP_HI(%a6),USER_FP2+4(%a6)
+	movel	ETEMP_LO(%a6),USER_FP2+8(%a6)
+	rts
+fp1_dst:
+	movel	ETEMP_EX(%a6),USER_FP1(%a6)
+	movel	ETEMP_HI(%a6),USER_FP1+4(%a6)
+	movel	ETEMP_LO(%a6),USER_FP1+8(%a6)
+	rts
+fp0_dst:
+	movel	ETEMP_EX(%a6),USER_FP0(%a6)
+	movel	ETEMP_HI(%a6),USER_FP0+4(%a6)
+	movel	ETEMP_LO(%a6),USER_FP0+8(%a6)
+	rts
+
+opclass3:
+	st	CU_ONLY(%a6)
+	movew	CMDREG1B(%a6),%d0	|check if packed moveout
+	andiw	#0x0c00,%d0	|isolate last 2 bits of size field
+	cmpiw	#0x0c00,%d0	|if size is 011 or 111, it is packed
+	beq	pack_out	|else it is norm or denorm
+	bra	mv_out
+
+
+|
+|	MOVE OUT
+|
+
+mv_tbl:
+	.long	li
+	.long	sgp
+	.long	xp
+	.long	mvout_end	|should never be taken
+	.long	wi
+	.long	dp
+	.long	bi
+	.long	mvout_end	|should never be taken
+mv_out:
+	bfextu	CMDREG1B(%a6){#3:#3},%d1	|put source specifier in d1
+	leal	mv_tbl,%a0
+	movel	%a0@(%d1:l:4),%a0
+	jmp	(%a0)
+
+|
+| This exit is for move-out to memory.  The aunfl bit is
+| set if the result is inex and unfl is signalled.
+|
+mvout_end:
+	btstb	#inex2_bit,FPSR_EXCEPT(%a6)
+	beqs	no_aufl
+	btstb	#unfl_bit,FPSR_EXCEPT(%a6)
+	beqs	no_aufl
+	bsetb	#aunfl_bit,FPSR_AEXCEPT(%a6)
+no_aufl:
+	clrw	NMNEXC(%a6)
+	bclrb	#E1,E_BYTE(%a6)
+	fmovel	#0,%FPSR			|clear any cc bits from res_func
+|
+| Return ETEMP to extended format from internal extended format so
+| that gen_except will have a correctly signed value for ovfl/unfl
+| handlers.
+|
+	bfclr	ETEMP_SGN(%a6){#0:#8}
+	beqs	mvout_con
+	bsetb	#sign_bit,ETEMP_EX(%a6)
+mvout_con:
+	rts
+|
+| This exit is for move-out to int register.  The aunfl bit is
+| not set in any case for this move.
+|
+mvouti_end:
+	clrw	NMNEXC(%a6)
+	bclrb	#E1,E_BYTE(%a6)
+	fmovel	#0,%FPSR			|clear any cc bits from res_func
+|
+| Return ETEMP to extended format from internal extended format so
+| that gen_except will have a correctly signed value for ovfl/unfl
+| handlers.
+|
+	bfclr	ETEMP_SGN(%a6){#0:#8}
+	beqs	mvouti_con
+	bsetb	#sign_bit,ETEMP_EX(%a6)
+mvouti_con:
+	rts
+|
+| li is used to handle a long integer source specifier
+|
+
+li:
+	moveql	#4,%d0		|set byte count
+
+	btstb	#7,STAG(%a6)	|check for extended denorm
+	bne	int_dnrm	|if so, branch
+
+	fmovemx ETEMP(%a6),%fp0-%fp0
+	fcmpd	#0x41dfffffffc00000,%fp0
+| 41dfffffffc00000 in dbl prec = 401d0000fffffffe00000000 in ext prec
+	fbge	lo_plrg
+	fcmpd	#0xc1e0000000000000,%fp0
+| c1e0000000000000 in dbl prec = c01e00008000000000000000 in ext prec
+	fble	lo_nlrg
+|
+| at this point, the answer is between the largest pos and neg values
+|
+	movel	USER_FPCR(%a6),%d1	|use user's rounding mode
+	andil	#0x30,%d1
+	fmovel	%d1,%fpcr
+	fmovel	%fp0,L_SCR1(%a6)	|let the 040 perform conversion
+	fmovel %fpsr,%d1
+	orl	%d1,USER_FPSR(%a6)	|capture inex2/ainex if set
+	bra	int_wrt
+
+
+lo_plrg:
+	movel	#0x7fffffff,L_SCR1(%a6)	|answer is largest positive int
+	fbeq	int_wrt			|exact answer
+	fcmpd	#0x41dfffffffe00000,%fp0
+| 41dfffffffe00000 in dbl prec = 401d0000ffffffff00000000 in ext prec
+	fbge	int_operr		|set operr
+	bra	int_inx			|set inexact
+
+lo_nlrg:
+	movel	#0x80000000,L_SCR1(%a6)
+	fbeq	int_wrt			|exact answer
+	fcmpd	#0xc1e0000000100000,%fp0
+| c1e0000000100000 in dbl prec = c01e00008000000080000000 in ext prec
+	fblt	int_operr		|set operr
+	bra	int_inx			|set inexact
+
+|
+| wi is used to handle a word integer source specifier
+|
+
+wi:
+	moveql	#2,%d0		|set byte count
+
+	btstb	#7,STAG(%a6)	|check for extended denorm
+	bne	int_dnrm	|branch if so
+
+	fmovemx ETEMP(%a6),%fp0-%fp0
+	fcmps	#0x46fffe00,%fp0
+| 46fffe00 in sgl prec = 400d0000fffe000000000000 in ext prec
+	fbge	wo_plrg
+	fcmps	#0xc7000000,%fp0
+| c7000000 in sgl prec = c00e00008000000000000000 in ext prec
+	fble	wo_nlrg
+
+|
+| at this point, the answer is between the largest pos and neg values
+|
+	movel	USER_FPCR(%a6),%d1	|use user's rounding mode
+	andil	#0x30,%d1
+	fmovel	%d1,%fpcr
+	fmovew	%fp0,L_SCR1(%a6)	|let the 040 perform conversion
+	fmovel %fpsr,%d1
+	orl	%d1,USER_FPSR(%a6)	|capture inex2/ainex if set
+	bra	int_wrt
+
+wo_plrg:
+	movew	#0x7fff,L_SCR1(%a6)	|answer is largest positive int
+	fbeq	int_wrt			|exact answer
+	fcmps	#0x46ffff00,%fp0
+| 46ffff00 in sgl prec = 400d0000ffff000000000000 in ext prec
+	fbge	int_operr		|set operr
+	bra	int_inx			|set inexact
+
+wo_nlrg:
+	movew	#0x8000,L_SCR1(%a6)
+	fbeq	int_wrt			|exact answer
+	fcmps	#0xc7000080,%fp0
+| c7000080 in sgl prec = c00e00008000800000000000 in ext prec
+	fblt	int_operr		|set operr
+	bra	int_inx			|set inexact
+
+|
+| bi is used to handle a byte integer source specifier
+|
+
+bi:
+	moveql	#1,%d0		|set byte count
+
+	btstb	#7,STAG(%a6)	|check for extended denorm
+	bne	int_dnrm	|branch if so
+
+	fmovemx ETEMP(%a6),%fp0-%fp0
+	fcmps	#0x42fe0000,%fp0
+| 42fe0000 in sgl prec = 40050000fe00000000000000 in ext prec
+	fbge	by_plrg
+	fcmps	#0xc3000000,%fp0
+| c3000000 in sgl prec = c00600008000000000000000 in ext prec
+	fble	by_nlrg
+
+|
+| at this point, the answer is between the largest pos and neg values
+|
+	movel	USER_FPCR(%a6),%d1	|use user's rounding mode
+	andil	#0x30,%d1
+	fmovel	%d1,%fpcr
+	fmoveb	%fp0,L_SCR1(%a6)	|let the 040 perform conversion
+	fmovel %fpsr,%d1
+	orl	%d1,USER_FPSR(%a6)	|capture inex2/ainex if set
+	bra	int_wrt
+
+by_plrg:
+	moveb	#0x7f,L_SCR1(%a6)		|answer is largest positive int
+	fbeq	int_wrt			|exact answer
+	fcmps	#0x42ff0000,%fp0
+| 42ff0000 in sgl prec = 40050000ff00000000000000 in ext prec
+	fbge	int_operr		|set operr
+	bra	int_inx			|set inexact
+
+by_nlrg:
+	moveb	#0x80,L_SCR1(%a6)
+	fbeq	int_wrt			|exact answer
+	fcmps	#0xc3008000,%fp0
+| c3008000 in sgl prec = c00600008080000000000000 in ext prec
+	fblt	int_operr		|set operr
+	bra	int_inx			|set inexact
+
+|
+| Common integer routines
+|
+| int_drnrm---account for possible nonzero result for round up with positive
+| operand and round down for negative answer.  In the first case (result = 1)
+| byte-width (store in d0) of result must be honored.  In the second case,
+| -1 in L_SCR1(a6) will cover all contingencies (FMOVE.B/W/L out).
+
+int_dnrm:
+	movel	#0,L_SCR1(%a6)	| initialize result to 0
+	bfextu	FPCR_MODE(%a6){#2:#2},%d1	| d1 is the rounding mode
+	cmpb	#2,%d1
+	bmis	int_inx		| if RN or RZ, done
+	bnes	int_rp		| if RP, continue below
+	tstw	ETEMP(%a6)	| RM: store -1 in L_SCR1 if src is negative
+	bpls	int_inx		| otherwise result is 0
+	movel	#-1,L_SCR1(%a6)
+	bras	int_inx
+int_rp:
+	tstw	ETEMP(%a6)	| RP: store +1 of proper width in L_SCR1 if
+|				; source is greater than 0
+	bmis	int_inx		| otherwise, result is 0
+	lea	L_SCR1(%a6),%a1	| a1 is address of L_SCR1
+	addal	%d0,%a1		| offset by destination width -1
+	subal	#1,%a1
+	bsetb	#0,(%a1)		| set low bit at a1 address
+int_inx:
+	oril	#inx2a_mask,USER_FPSR(%a6)
+	bras	int_wrt
+int_operr:
+	fmovemx %fp0-%fp0,FPTEMP(%a6)	|FPTEMP must contain the extended
+|				;precision source that needs to be
+|				;converted to integer this is required
+|				;if the operr exception is enabled.
+|				;set operr/aiop (no inex2 on int ovfl)
+
+	oril	#opaop_mask,USER_FPSR(%a6)
+|				;fall through to perform int_wrt
+int_wrt:
+	movel	EXC_EA(%a6),%a1	|load destination address
+	tstl	%a1		|check to see if it is a dest register
+	beqs	wrt_dn		|write data register
+	lea	L_SCR1(%a6),%a0	|point to supervisor source address
+	bsrl	mem_write
+	bra	mvouti_end
+
+wrt_dn:
+	movel	%d0,-(%sp)	|d0 currently contains the size to write
+	bsrl	get_fline	|get_fline returns Dn in d0
+	andiw	#0x7,%d0		|isolate register
+	movel	(%sp)+,%d1	|get size
+	cmpil	#4,%d1		|most frequent case
+	beqs	sz_long
+	cmpil	#2,%d1
+	bnes	sz_con
+	orl	#8,%d0		|add 'word' size to register#
+	bras	sz_con
+sz_long:
+	orl	#0x10,%d0		|add 'long' size to register#
+sz_con:
+	movel	%d0,%d1		|reg_dest expects size:reg in d1
+	bsrl	reg_dest	|load proper data register
+	bra	mvouti_end
+xp:
+	lea	ETEMP(%a6),%a0
+	bclrb	#sign_bit,LOCAL_EX(%a0)
+	sne	LOCAL_SGN(%a0)
+	btstb	#7,STAG(%a6)	|check for extended denorm
+	bne	xdnrm
+	clrl	%d0
+	bras	do_fp		|do normal case
+sgp:
+	lea	ETEMP(%a6),%a0
+	bclrb	#sign_bit,LOCAL_EX(%a0)
+	sne	LOCAL_SGN(%a0)
+	btstb	#7,STAG(%a6)	|check for extended denorm
+	bne	sp_catas	|branch if so
+	movew	LOCAL_EX(%a0),%d0
+	lea	sp_bnds,%a1
+	cmpw	(%a1),%d0
+	blt	sp_under
+	cmpw	2(%a1),%d0
+	bgt	sp_over
+	movel	#1,%d0		|set destination format to single
+	bras	do_fp		|do normal case
+dp:
+	lea	ETEMP(%a6),%a0
+	bclrb	#sign_bit,LOCAL_EX(%a0)
+	sne	LOCAL_SGN(%a0)
+
+	btstb	#7,STAG(%a6)	|check for extended denorm
+	bne	dp_catas	|branch if so
+
+	movew	LOCAL_EX(%a0),%d0
+	lea	dp_bnds,%a1
+
+	cmpw	(%a1),%d0
+	blt	dp_under
+	cmpw	2(%a1),%d0
+	bgt	dp_over
+
+	movel	#2,%d0		|set destination format to double
+|				;fall through to do_fp
+|
+do_fp:
+	bfextu	FPCR_MODE(%a6){#2:#2},%d1	|rnd mode in d1
+	swap	%d0			|rnd prec in upper word
+	addl	%d0,%d1			|d1 has PREC/MODE info
+
+	clrl	%d0			|clear g,r,s
+
+	bsrl	round			|round
+
+	movel	%a0,%a1
+	movel	EXC_EA(%a6),%a0
+
+	bfextu	CMDREG1B(%a6){#3:#3},%d1	|extract destination format
+|					;at this point only the dest
+|					;formats sgl, dbl, ext are
+|					;possible
+	cmpb	#2,%d1
+	bgts	ddbl			|double=5, extended=2, single=1
+	bnes	dsgl
+|					;fall through to dext
+dext:
+	bsrl	dest_ext
+	bra	mvout_end
+dsgl:
+	bsrl	dest_sgl
+	bra	mvout_end
+ddbl:
+	bsrl	dest_dbl
+	bra	mvout_end
+
+|
+| Handle possible denorm or catastrophic underflow cases here
+|
+xdnrm:
+	bsr	set_xop		|initialize WBTEMP
+	bsetb	#wbtemp15_bit,WB_BYTE(%a6) |set wbtemp15
+
+	movel	%a0,%a1
+	movel	EXC_EA(%a6),%a0	|a0 has the destination pointer
+	bsrl	dest_ext	|store to memory
+	bsetb	#unfl_bit,FPSR_EXCEPT(%a6)
+	bra	mvout_end
+
+sp_under:
+	bsetb	#etemp15_bit,STAG(%a6)
+
+	cmpw	4(%a1),%d0
+	blts	sp_catas	|catastrophic underflow case
+
+	movel	#1,%d0		|load in round precision
+	movel	#sgl_thresh,%d1	|load in single denorm threshold
+	bsrl	dpspdnrm	|expects d1 to have the proper
+|				;denorm threshold
+	bsrl	dest_sgl	|stores value to destination
+	bsetb	#unfl_bit,FPSR_EXCEPT(%a6)
+	bra	mvout_end	|exit
+
+dp_under:
+	bsetb	#etemp15_bit,STAG(%a6)
+
+	cmpw	4(%a1),%d0
+	blts	dp_catas	|catastrophic underflow case
+
+	movel	#dbl_thresh,%d1	|load in double precision threshold
+	movel	#2,%d0
+	bsrl	dpspdnrm	|expects d1 to have proper
+|				;denorm threshold
+|				;expects d0 to have round precision
+	bsrl	dest_dbl	|store value to destination
+	bsetb	#unfl_bit,FPSR_EXCEPT(%a6)
+	bra	mvout_end	|exit
+
+|
+| Handle catastrophic underflow cases here
+|
+sp_catas:
+| Temp fix for z bit set in unf_sub
+	movel	USER_FPSR(%a6),-(%a7)
+
+	movel	#1,%d0		|set round precision to sgl
+
+	bsrl	unf_sub		|a0 points to result
+
+	movel	(%a7)+,USER_FPSR(%a6)
+
+	movel	#1,%d0
+	subw	%d0,LOCAL_EX(%a0) |account for difference between
+|				;denorm/norm bias
+
+	movel	%a0,%a1		|a1 has the operand input
+	movel	EXC_EA(%a6),%a0	|a0 has the destination pointer
+
+	bsrl	dest_sgl	|store the result
+	oril	#unfinx_mask,USER_FPSR(%a6)
+	bra	mvout_end
+
+dp_catas:
+| Temp fix for z bit set in unf_sub
+	movel	USER_FPSR(%a6),-(%a7)
+
+	movel	#2,%d0		|set round precision to dbl
+	bsrl	unf_sub		|a0 points to result
+
+	movel	(%a7)+,USER_FPSR(%a6)
+
+	movel	#1,%d0
+	subw	%d0,LOCAL_EX(%a0) |account for difference between
+|				;denorm/norm bias
+
+	movel	%a0,%a1		|a1 has the operand input
+	movel	EXC_EA(%a6),%a0	|a0 has the destination pointer
+
+	bsrl	dest_dbl	|store the result
+	oril	#unfinx_mask,USER_FPSR(%a6)
+	bra	mvout_end
+
+|
+| Handle catastrophic overflow cases here
+|
+sp_over:
+| Temp fix for z bit set in unf_sub
+	movel	USER_FPSR(%a6),-(%a7)
+
+	movel	#1,%d0
+	leal	FP_SCR1(%a6),%a0	|use FP_SCR1 for creating result
+	movel	ETEMP_EX(%a6),(%a0)
+	movel	ETEMP_HI(%a6),4(%a0)
+	movel	ETEMP_LO(%a6),8(%a0)
+	bsrl	ovf_res
+
+	movel	(%a7)+,USER_FPSR(%a6)
+
+	movel	%a0,%a1
+	movel	EXC_EA(%a6),%a0
+	bsrl	dest_sgl
+	orl	#ovfinx_mask,USER_FPSR(%a6)
+	bra	mvout_end
+
+dp_over:
+| Temp fix for z bit set in ovf_res
+	movel	USER_FPSR(%a6),-(%a7)
+
+	movel	#2,%d0
+	leal	FP_SCR1(%a6),%a0	|use FP_SCR1 for creating result
+	movel	ETEMP_EX(%a6),(%a0)
+	movel	ETEMP_HI(%a6),4(%a0)
+	movel	ETEMP_LO(%a6),8(%a0)
+	bsrl	ovf_res
+
+	movel	(%a7)+,USER_FPSR(%a6)
+
+	movel	%a0,%a1
+	movel	EXC_EA(%a6),%a0
+	bsrl	dest_dbl
+	orl	#ovfinx_mask,USER_FPSR(%a6)
+	bra	mvout_end
+
+|
+|	DPSPDNRM
+|
+| This subroutine takes an extended normalized number and denormalizes
+| it to the given round precision. This subroutine also decrements
+| the input operand's exponent by 1 to account for the fact that
+| dest_sgl or dest_dbl expects a normalized number's bias.
+|
+| Input: a0  points to a normalized number in internal extended format
+|	 d0  is the round precision (=1 for sgl; =2 for dbl)
+|	 d1  is the single precision or double precision
+|	     denorm threshold
+|
+| Output: (In the format for dest_sgl or dest_dbl)
+|	 a0   points to the destination
+|	 a1   points to the operand
+|
+| Exceptions: Reports inexact 2 exception by setting USER_FPSR bits
+|
+dpspdnrm:
+	movel	%d0,-(%a7)	|save round precision
+	clrl	%d0		|clear initial g,r,s
+	bsrl	dnrm_lp		|careful with d0, it's needed by round
+
+	bfextu	FPCR_MODE(%a6){#2:#2},%d1 |get rounding mode
+	swap	%d1
+	movew	2(%a7),%d1	|set rounding precision
+	swap	%d1		|at this point d1 has PREC/MODE info
+	bsrl	round		|round result, sets the inex bit in
+|				;USER_FPSR if needed
+
+	movew	#1,%d0
+	subw	%d0,LOCAL_EX(%a0) |account for difference in denorm
+|				;vs norm bias
+
+	movel	%a0,%a1		|a1 has the operand input
+	movel	EXC_EA(%a6),%a0	|a0 has the destination pointer
+	addw	#4,%a7		|pop stack
+	rts
+|
+| SET_XOP initialized WBTEMP with the value pointed to by a0
+| input: a0 points to input operand in the internal extended format
+|
+set_xop:
+	movel	LOCAL_EX(%a0),WBTEMP_EX(%a6)
+	movel	LOCAL_HI(%a0),WBTEMP_HI(%a6)
+	movel	LOCAL_LO(%a0),WBTEMP_LO(%a6)
+	bfclr	WBTEMP_SGN(%a6){#0:#8}
+	beqs	sxop
+	bsetb	#sign_bit,WBTEMP_EX(%a6)
+sxop:
+	bfclr	STAG(%a6){#5:#4}	|clear wbtm66,wbtm1,wbtm0,sbit
+	rts
+|
+|	P_MOVE
+|
+p_movet:
+	.long	p_move
+	.long	p_movez
+	.long	p_movei
+	.long	p_moven
+	.long	p_move
+p_regd:
+	.long	p_dyd0
+	.long	p_dyd1
+	.long	p_dyd2
+	.long	p_dyd3
+	.long	p_dyd4
+	.long	p_dyd5
+	.long	p_dyd6
+	.long	p_dyd7
+
+pack_out:
+	leal	p_movet,%a0	|load jmp table address
+	movew	STAG(%a6),%d0	|get source tag
+	bfextu	%d0{#16:#3},%d0	|isolate source bits
+	movel	(%a0,%d0.w*4),%a0	|load a0 with routine label for tag
+	jmp	(%a0)		|go to the routine
+
+p_write:
+	movel	#0x0c,%d0	|get byte count
+	movel	EXC_EA(%a6),%a1	|get the destination address
+	bsr	mem_write	|write the user's destination
+	moveb	#0,CU_SAVEPC(%a6) |set the cu save pc to all 0's
+
+|
+| Also note that the dtag must be set to norm here - this is because
+| the 040 uses the dtag to execute the correct microcode.
+|
+        bfclr    DTAG(%a6){#0:#3}  |set dtag to norm
+
+	rts
+
+| Notes on handling of special case (zero, inf, and nan) inputs:
+|	1. Operr is not signalled if the k-factor is greater than 18.
+|	2. Per the manual, status bits are not set.
+|
+
+p_move:
+	movew	CMDREG1B(%a6),%d0
+	btstl	#kfact_bit,%d0	|test for dynamic k-factor
+	beqs	statick		|if clear, k-factor is static
+dynamick:
+	bfextu	%d0{#25:#3},%d0	|isolate register for dynamic k-factor
+	lea	p_regd,%a0
+	movel	%a0@(%d0:l:4),%a0
+	jmp	(%a0)
+statick:
+	andiw	#0x007f,%d0	|get k-factor
+	bfexts	%d0{#25:#7},%d0	|sign extend d0 for bindec
+	leal	ETEMP(%a6),%a0	|a0 will point to the packed decimal
+	bsrl	bindec		|perform the convert; data at a6
+	leal	FP_SCR1(%a6),%a0	|load a0 with result address
+	bral	p_write
+p_movez:
+	leal	ETEMP(%a6),%a0	|a0 will point to the packed decimal
+	clrw	2(%a0)		|clear lower word of exp
+	clrl	4(%a0)		|load second lword of ZERO
+	clrl	8(%a0)		|load third lword of ZERO
+	bra	p_write		|go write results
+p_movei:
+	fmovel	#0,%FPSR		|clear aiop
+	leal	ETEMP(%a6),%a0	|a0 will point to the packed decimal
+	clrw	2(%a0)		|clear lower word of exp
+	bra	p_write		|go write the result
+p_moven:
+	leal	ETEMP(%a6),%a0	|a0 will point to the packed decimal
+	clrw	2(%a0)		|clear lower word of exp
+	bra	p_write		|go write the result
+
+|
+| Routines to read the dynamic k-factor from Dn.
+|
+p_dyd0:
+	movel	USER_D0(%a6),%d0
+	bras	statick
+p_dyd1:
+	movel	USER_D1(%a6),%d0
+	bras	statick
+p_dyd2:
+	movel	%d2,%d0
+	bras	statick
+p_dyd3:
+	movel	%d3,%d0
+	bras	statick
+p_dyd4:
+	movel	%d4,%d0
+	bras	statick
+p_dyd5:
+	movel	%d5,%d0
+	bras	statick
+p_dyd6:
+	movel	%d6,%d0
+	bra	statick
+p_dyd7:
+	movel	%d7,%d0
+	bra	statick
+
+	|end