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BB-H138F-BM_1988
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7-sources/arith.mac
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TITLE ARITH - MULTIPLE PRECISION ARITHMETIC FOR EDT
; IDENT 1-001
;AUTHOR : GRAHAM BEECH CREATION DATE : 28-JAN-1983
;******************************************************************************
;* *
;* COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATIO 1978, 1988 ALL RIGHTS RESERVED.*
;* *
;* THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED *
;* ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE *
;* INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR ANY OTHER *
;* COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY *
;* OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY *
;* TRANSFERRED. *
;* *
;* THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE *
;* AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT *
;* CORPORATION. *
;* *
;* DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS *
;* SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL. *
;* *
;******************************************************************************
;
;FACILITY: EDT VERSION 3
;
;FUNCTIONAL DESCRIPTION:
;
; THIS MODULE CONTAINS 54-BIT ARITHMETIC ROUTINES TO HANDLE THE LINE
; NUMBERS USED BY EDT VERSION 3.
;
;MODIFIED BY:
;
; 1-001 ORIGINAL. GB 28-Jan-1983
;--
; ALL ROUTINES ARE CALLED BY THE SAME INTERFACE, TWO SOURCE PARAMETERS
; AND A DESTINATION PARAMETER, EACH OF WHICH IS THE ADDRESS OF A 54-BIT
; UNSIGNED INTEGER.
;
SALL
TWOSEG
RELOC 400000
;
; TABLE OF CONTENTS:
;
INTERN A54%AD,A54%SU,A54%MU,MOVELI
;
; INCLUDE FILES:
;
SEARCH MACSYM
SEARCH MONSYM
; DEFINITIONS
T1=1
T2=2
T3=3
T4=4
P=17
; A54%AD - MULTIPLE PRECISION ADDITION
;
; ADD TWO 54-BIT NUMBERS USING 2-WORD ARITHMETIC, AND RETURN THE CARRY-BIT
;
; FORMAL PARAMTERS
;
; P1 POINTER TO SOURCE1
; P2 POINTER TO SOURCE2
; P3 POINTER TO DESTINATION (RESULT)
;-
A54%AD::
DMOVE T1,@-2(P) ;GET SOURCE1 INTO T1,T2
HRRZS T2 ;54 BITS ONLY
EXCH T1,T2 ;SWAP ROUND FOR ARITHMETIC
DMOVE T3,@-3(P) ;GET SOURCE2 INTO T3,T4
HRRZS T4 ;ZERO UNUSED BITS
EXCH T3,T4 ;SWAP ROUND FOR ARITHMETIC
DADD T1,T3 ;ADD THEM
MOVE T3,-1(P) ;GET DESTINATION ADDRESS
MOVEM T2,(T3) ;STORE RESULT
HRRM T1,1(T3) ;...
TLNN T1,-1 ;LOOK FOR OVERFLOW
TDZA T1,T1 ;NO OVERFLOW.
MOVEI T1,1 ;RETURN OVERFLOW
RET
; A54%SU - MULTIPLE PRECISION SUBTRACTION
;
; SUBTRACT TWO 54-BIT NUMBERS USING 2-WORD ARITHMETIC
;
; FORMAL PARAMTERS
;
; P1 POINTER TO SOURCE1
; P2 POINTER TO SOURCE2
; P3 POINTER TO DESTINATION (RESULT)
;-
A54%SU::
DMOVE T1,@-2(P) ;GET SOURCE1 INTO T1,T2
HRRZS T2 ;54 BITS ONLY
EXCH T1,T2 ;SWAP ROUND FOR ARITHMETIC
DMOVE T3,@-3(P) ;GET SOURCE2 INTO T3,T4
HRRZS T4 ;ZERO UNUSED BITS
EXCH T3,T4 ;SWAP ROUND FOR ARITHMETIC
DSUB T1,T3 ;SUBTRACT SOURCE2 FROM SOURCE1
MOVE T3,-1(P) ;GET DESTINATION ADDRESS
MOVEM T2,(T3) ;STORE RESULT
HRRM T1,1(T3) ;...
;
; EDT DOES NOT ALLOW RESULT TO GO NEGATIVE SO JUST RETURN
;
RET
; A54%MU - MULTIPLE PRECISION MULTIPLICATION
;
; MULTIPLY TWO 54-BIT NUMBERS USING 2-WORD ARITHMETIC.
;
; FORMAL PARAMTERS
;
; P1 POINTER TO SOURCE1
; P2 POINTER TO SOURCE2
; P3 POINTER TO DESTINATION (RESULT)
;-
A54%MU::
DMOVE T1,@-2(P) ;GET SOURCE1 INTO T1,T2
HRRZS T2 ;54 BITS ONLY
EXCH T1,T2 ;SWAP ROUND FOR ARITHMETIC
DMOVE T3,@-3(P) ;GET SOURCE2 INTO T3,T4
HRRZS T4 ;ZERO UNUSED BITS
EXCH T3,T4 ;SWAP ROUND FOR ARITHMETIC
DMUL T1,T3 ;ADD THEM
MOVE T1,-1(P) ;GET DESTINATION ADDRESS
MOVEM T4,(T1) ;STORE RESULT
HRRM T3,1(T1) ;...
;
; NO CHECK FOR OVERFLOW EDT SHOULD NOT LET IT HAPPEN ??!
;
RET
;
; MOVELINE - COPY A 54 BIT LINE NUMBER
;
; FORMAL PARAMETERS:
;
; SOURCE - LINE NO. TO COPY
; DESTINATION - WHERE TO COPY IT TO
;
MOVELI::
DMOVE T1,@-2(P) ;GET LINE # TO COPY
MOVE T3,-1(P) ;WHERE TO PUT IT
MOVEM T1,(T3) ;STORE LO & MD
HRRM T2,1(T3) ;STORE HI
RET
END