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Trailing-Edge - PDP-10 Archives - BB-D480C-SB_1981 - fordar.unv
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x,5@P I` 
zd9
	XALL

z 
	ENTRY	DFL.A		;
wxENTRY POINT TO DF
wXL.A
	SIXBIT	/DF
{L.A/
DFL.A:	MO
w8VEI	A+1,0		;CLEA
{ R LOW ORDER WORD
{@
	ASHC	A,-8		;MA
{`KE ROOM FOR EXPON
|ENT IN HI WORD
	
| TLC	A,243000	;SE
|@T EXP TO 27+8 DEC
|`IMAL
	DFAD	A,[E
}XP 0,0]	;NORMALIZ

FPE
	POPJ	P,		;RET

FpURN A=THE DOUBLE

G PRECISION RESULT
S0 

GPdq
	XALL


Gp
	ENTRY	IDF.A
	

HSIXBIT	/IDF.A/

H0IDF.A:	PUSH	P,L	

HP	;SAVE THE SCRATC

HpH REG
	HLRE	L,A

I		;GET THE EXPONE

I0NT
	ASH	L,-9		;R

IPIGHT 8 BITS
	JUM

IpPGE	A,IDF.XT	;JU

JMP IF POS.
	DMOV

J0N	A,A		;NEGATE

JP
	TRC	L,-1		;COMP

JpLEMENT THE EXPONE

KNT
IDF.XT:	TLZ	

K0A,777000	;CLEAR T

KPHE EXPONENT
	ASH

KpC	A,-201-^D26(L)

L	;CHANGE FRACTION

L0 TO INTEGER
	TLN

LPE	L,400000	;SKIP 

LpIF POS.
	MOVN	A

M,A		;NEGATE
	PO

M0P	P,L		;RESTORE T

MPHE SCRATCH REG
	

MpPOPJ	P,		;RETURN 

NA=FIXED NUMBER
g:8 

NPeG
	XALL


Np
	ENTRY	SNG.A
	

OSIXBIT	/SNG.A/

O0SNG.A:	JUMPL	A,

OPSNG3		;NEGATIVE A

OpRGUMENT?
	TLNE	

PA+1,(1B1)	;POSITI

P0VE. ROUND REQUIRE

PPD?
	TRON	A,1		;

PpYES, TRY TO ROUND

Q BY SETTING LSB

Q0	  POPJ	P,		;WE W

QPON, FINISHED
	MO

QpVE	A+1,A		;COPY

R HIGH PART OF ARG

R0
	AND	A,[777000

RP,,1]	;MAKE UNNORM

RpALIZED LSB, SAME 

SEXPONENT
	FAD	A

S0,A+1		;ROUND & R

SPENORMALIZE
	POPJ

Sp	P,

;HERE IF A

TRG IS NEGATIVE
S

T0NG3:	DMOVN	A,A	

TP	;MAKE POSITIVE

Tp	TLNE	A+1,(1B1)	

U;NEED ROUNDING?

U0	TRON	A,1		;YES,

UP TRY TO DO IT BY 

UpSETTING LSB
	JRS

VT	SNG4		;DONE
	M

V0OVN	A+1,A		;MAK

VPE RE-NEGATED COPY

Vp OF HIGH PART
	O

WRCA	A,[777,,-1]	

W0;GET UNNORM NEG L

WPSB WITH SAME EXPO

WpNENT
	FADR	A,A

X+1		;ROUND & NORM

X0ALIZE
	POPJ	P,

XP
SNG4:	MOVN	A,

XpA		;RE-NEGATE
	POPJ	P,		;EXIT
>}{woP