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/ FLOATING POINT MATH PACKAGE *** FLOAT.04 *** / OCTOBER 21, 1970 /COPYRIGHT 1969,1970 DIGITAL EQUIPMENT CORP. / MAYNARD, MASS. / /********** /PATCHED ON 8/16/71 TO FIX AN ERROR WHICH DOES NOT OCCUR WHEN USING /THE 12/2/70 VERSION OF LIB8.RL. THIS INDICATES THAT THIS FILE /(AND PREHAPS OTHERS OF THE LIBRARY SOURCES ON THIS TAPE) IS NOT /THE VERSION USED BY DEC WHEN BUILDING THE 12/2/70 VERSION /OF LIB8.RL!!! SO BEWARE IF YOU REBUILD LIB8.RL!!! /(THE PATCH CONSISTED IN MOVING LABEL FADEX UP 1 LINE) /********** / ENTRIES / ENTRY FAD ENTRY FSB ENTRY FMP ENTRY FDV ENTRY STO ENTRY FLOT ENTRY FLOAT ENTRY FIX ENTRY IFIX ENTRY IFAD ENTRY ISTO ENTRY ABS ENTRY CHS /THE FOLLOWING DEFINITIONS ENABLE LIBRARY OPTIMIZATIONS /WHERE CRITICAL TIMING CONSIDERATIONS EXIST. /THEY SHOULD BE USED WITH EXTREME CAUTION, AND MUST /REFERENCE CURRENT PAGE AND PAGE ZERO SYMBOLS ONLY. OPDEF TADI 1400 OPDEF DCAI 3400 OPDEF JMSI 4400 OPDEF JMPI 5400 SKPDF JMSKP 4000 / / ABSYM HAC 20 ABSYM MAC 21 ABSYM LAC 22 ABSYM SRH 23 ABSYM SRM 24 ABSYM SRL 25 ABSYM ACS 26 ABSYM ACX 27 ABSYM SRS 30 ABSYM SRX 31 ABSYM MQH 30 ABSYM MQM 31 ABSYM MQL 32 // ADDITION AND SUBTRACTION ROUTINE // LAP /LEAVE AUTO PAGING ADSRAD, ADSRAC /SOME INDIRECTS TO SAVE CORE... ARSAB, ARS GTSPLA, GTSPLT NORMAD, NORMAC COMAD, COM FSB, BLOCK 2 /FLOATING POINT SUBTRACT TAD FSB / CALL 1,FSB DCA FAD / ARG <F.P. VARIABLE> TAD FSB# DCA FAD# CLA CLL CML RAR JMP ED1 / ER1, FAD FAD, BLOCK 2 /FLOATING POINT ADD SUBROUTINE ED1, DCA FSB / CALL 1,FAD TAD FAD / ARG <VARIABLE> DCA FAD1 FAD1, NOP /CDF TO PICK UP ARGUMENT TADI FAD# INC FAD# DCA 7 CLA CMA TADI FAD# INC FAD# DCA 10 FADENT, TAD ER1 DCA ER0 TAD ACH /EXAMINE THE FLOATING AC SNA CLA JMP FADLD /IT'S ZERO, DO A LOAD... JMSI GTSPLA JMP FADEND TAD SRS TAD FSB DCA SRS TAD ACX SNA JMP SHFAC CIA TAD SRX SMA JMP SHFAC DCA FSB SHFSR, TAD SRH CLL RAR DCA SRH TAD SRM RAR DCA SRM TAD SRL RAR DCA SRL ISZ FSB JMP SHFSR JMP JD1 / SHFAC, CMA DCA FSB TAD SRX DCA ACX JMP ED3A ED3, JMSI ARSAB ED3A, ISZ FSB JMP ED3 / JD1, TAD ACS SMA CLA JMP ED4 CLA CLL CMA RTL / GENERATE -3 JMSI COMAD ED4, TAD SRS SPA CLA JMSI COMAD JMSI ADSRAD TAD HAC SMA CLA JMP ED5 CLA CLL CMA RTL JMSI COMAD CLA CLL CML RAR ED5, DCA ACS DCA RSW FADEND, JMSI NORMAD JMP FADEX FADLD, TAD 7 /FLOATING LOAD WHEN AC=0 DCA FADSB# JMS FADSB TAD FSB AND ABSSW DCA ACH JMS FADSB DCA ACM JMS FADSB DCA ACL CLA CMA DCA ABSSW /******** /8/16/71 PATCH CONSISTED OF MOVING FADEX UP 1 LINE. FADEX, DCA FSB /FOR IFAD AFTER SUBTRACT CLA STL RTL /=0002 TAD FAD /HIGH SPEED RETURN DCA FAD3 FAD3, NOP JMPI FAD# ABSSW, 7777 /ABSOLUTE VALUE SWITCH FADSB, 0 /TIME SAVING SUBROUTINE NOP /CHANGED TO CDF TADI 10 JMPI FADSB / FLOATING POINT ABSOLUTE VALUE FUNCTION ABS, BLOCK 2 / CALL 1,ABS TAD ABS / ARG <F.P. VARIABLE> DCA FAD TAD ABS# DCA FAD# CLL STA RAR /=3777 DCA ABSSW JMP ED1 /GO INTO ADD ROUTINE... PAGE
/ ROUTINE TO GET OPERAND INTO SR, SEPARATE SIGNS AND / EXPONENTS OF AC AND SR, AND MOVE GLOBAL AC TO LOCAL AC. / GTSPLT, 0 TAD 7 DCA GTS1 GTS1, NOP TADI 10 /PICK UP HIGH ORDER WORD JMS SPLIT /MUST NOT CHANGE DATA FIELD**** DCA SRH TAD ACX SZA INC GTSPLT DCA SRX TAD ACS DCA SRS TADI 10 /PICK UP WORD 2 DCA SRM TADI 10 /PICK UP WORD 3 DCA SRL TAD ACH JMS SPLIT /EXPAND THE FLOATING AC... DCA HAC DCA RSW GTS2, TAD ACM /NEEDS LABEL TO FORCE CDF! DCA MAC TAD ACL DCA LAC JMPI GTSPLT / SPLIT, 0 /BREAK UP SIGN, EXPON, AND HI-ORD BITS DCA TMP /ROUTINE MUST NOT CHANGE DATA FIELD**** TAD TMP RAR RTR AND (377 DCA ACX CLA CLL CML RAR / = 4000 AND TMP DCA ACS TAD TMP AND (7 JMPI SPLIT TMP, 0 / / ALS, 0 /LOCAL AC SHIFT LEFT SUBROUTINE TAD LAC CLL RAL DCA LAC TAD MAC RAL DCA MAC TAD HAC RAL DCA HAC JMPI ALS / / ADD SR TO AC / ADSRAC, 0 /ADD LOCAL SR TO LOCAL AC CLL TAD LAC TAD SRL DCA LAC CLA RAL TAD MAC TAD SRM DCA MAC CLA RAL TAD HAC TAD SRH DCA HAC JMPI ADSRAC / / ROUTINE TO NORMALIZE AND RECOMBINE ACCUMULATOR, / AND PLACE LOCAL ACC. IN GLOBAL ACC. / ARSAD, ARS /SOME CORE SAVING INDIRECTS ERRAD, ERR RSW, 0 /ROUNDING BIT NORMAC, 0 /NORMALIZE AND PACKING SUBROUTINE ED6, TAD HAC TAD (7770 SPA CLA JMP RUND JMSI ARSAD ISZ ACX JMP ED6 / / ROUNDOFF ROUTINE / RUND, TAD RSW SNA CLA JMP LEFTST ISZ LAC JMP LEFTST ISZ MAC JMP LEFTST ISZ HAC DCA RSW JMP ED6 / LEFTST, TAD ACX SNA SPA JMP ZEROUT DCA ACX CLA CLL CMA RTL / = -3 TAD HAC SMA SZA CLA JMP COMBIN JMS ALS CLA CMA JMP LEFTST / COMBIN, TAD ACX CLL RAL RTL SPA JMPI ERRAD TAD HAC TAD ACS ED7, DCA ACH TAD MAC DCA ACM TAD LAC DCA ACL JMPI NORMAC ZEROUT, CLA DCA LAC DCA MAC JMP ED7 PAGE
/ / INDIRECT STORE / ISTO, BLOCK 2 /FLOATING POINT INDIRECT STORE TAD ISTO / CALL 1,ISTO DCA IST1 / ARG <2WORD ADDRESS> IST1, NOP TADI ISTO# INC ISTO# DCA IST2 TADI ISTO# DCA 7 TAD ISTO DCA STO TAD ISTO# DCA STO# IST2, NOP TADI 7 INC 7 DCA ISTO CLA CMA TADI 7 DCA 10 TAD ISTO DCA STOSB# JMP STOX / / / ROUTINE TO STORE CONTENTS OF FL. PT. ACC AND CLEAR IT / STO, BLOCK 2 / CALL 1,STO TAD STO / ARG <F.P. VARIABLE> DCA STO1 STO1, NOP /REPLACED BY CDF TADI STO# INC STO# DCA STOSB# CLA CMA TADI STO# DCA 10 STOX, TAD ACH JMS STOSB DCA ACH TAD ACM JMS STOSB DCA ACM TAD ACL JMS STOSB DCA ACL INC STO# CLA STL RTL /=0002 TAD STO /SOME TIME SAVING CODE... DCA STO3 STO3, NOP /REPLACED BY CIF CDF JMPI STO# STOSB, 0 /TIME SAVING SUBROUTINE NOP /CHANGED TO A CDF DESTINATION DCAI 10 JMPI STOSB / / FLOATING POINT TO FIXED POINT CONVERSION / FXER, 4611 3040 /"FIX" ERROR FIX, BLOCK 2 FIXX, TAD ACH JMS SPLIT DCA HAC TAD ACM DCA MAC TAD ACX TAD (-214 SMA JMP FIXERR TAD (-3 DCA SRM RSH, JMS ARS ISZ SRM JMP RSH TAD ACS RAL TAD MAC SZL CIA FIXRTN, DCA ACS DCA ACH DCA ACM DCA ACL TAD ACS RETRN FIX / IFIX, BLOCK 2 TAD IFIX DCA ADDR TAD IFIX# DCA ADDR# CALL 1,IFAD ADDR, ARG 0 TAD IFIX DCA FIX CLA CLL CML RTL / = 2 TAD IFIX# DCA FIX# JMP FIXX FIXERR, CALL 1,ERROR ARG FXER CLA CLL CMA RAR JMP FIXRTN /RETURN WITH 2047 IN FIXED AC PAGE
/ / FLOATING POINT MULTIPLICATION / ADSRAE, ADSRAC /SOME TIME SAVING INDIRECTS ARSAE, ARS COMAF, COM GTSPLB, GTSPLT NORMAG, NORMAC ER3, FMP FMP, BLOCK 2 TAD ER3 DCA ER0 TAD FMP DCA FMP1 FMP1, NOP /CDF TO FIELD OF CALLING PROGRAM TADI FMP# INC FMP# DCA 7 CLA CMA TADI FMP# INC FMP# DCA 10 JMSI GTSPLB /WARNING ***THIS INSTRUCTION SKIPS*** JMP MULZRO TAD ACS TAD SRS DCA ACS TAD ACX TAD SRX MULZRO, TAD (-201 DCA ACX TAD HAC DCA MQH TAD MAC DCA MQM TAD LAC DCA MQL DCA HAC TAD (-33 DCA CTR / MULT, JMSI ARSAE TAD MQH RAR DCA MQH TAD MQM RAR DCA MQM TAD MQL RAR DCA MQL SZL JMSI ADSRAE ISZ CTR JMP MULT JMSI NORMAG RETRN FMP / CTR, 0 / / FLOATING POINT DIVISION / DIVZ, 4411 2632 FDV, BLOCK 2 TAD FDV DCA FDV0 FDV0, NOP /CDF TO FIELD OF CALLING PROGRAM TADI FDV# INC FDV# DCA 7 CLA CMA TADI FDV# INC FDV# DCA 10 JMSI GTSPLB JMP DIVERR TAD ACS TAD SRS DCA ACS TAD SRX CIA TAD ACX TAD (177 DCA ACX DCA MQL TAD (-35 DCA CTR DVID, CLA CLL CML RAR / = 4000 AND SRH TAD HAC SPA CLA JMP FDV1 JMSI COMAF FDV1, JMSI ADSRAE TAD MQL RAL DCA MQL TAD MQM RAL DCA MQM TAD MQH RAL DCA MQH JMS ALS ISZ CTR JMP DVID / TAD MQH DCA HAC TAD MQM DCA MAC TAD MQL DCA LAC JMS NORMAC FDVRET, RETRN FDV DIVERR, CALL 1,ERROR ARG DIVZ CLA CLL CMA RAR DCA ACH JMP FDVRET PAGE
/ / ROUTINE TO GET TWO'S COMPLEMENT OF TRIPLE WORD NUMBER / IF NO ADDRESS IN AC UPON ENTRY, SR IS ASSUMED. / COM, 0 TAD (25 /ADDRESS OF SRL DCA PTR2 CLA CLL CMA RTL / = -3 DCA CTR2 ED8, TAD I PTR2 CMA SZL CLL IAC DCA I PTR2 CLA CMA CML TAD PTR2 DCA PTR2 ISZ CTR2 JMP ED8 JMP I COM PTR2, 0 CTR2, 0 / / CONVERT FIXED POINT TO FLOATING POINT / CPAGE 14 FLOAT, BLOCK 2 /FLOAT FUNCTION TAD FLOAT / CALL 1,FLOAT DCA FLO1 / ARG <INT. VARIABLE> FLO1, NOP TADI FLOAT# INC FLOAT# DCA FLO2 TADI FLOAT# INC FLOAT# DCA 7 TAD FLOAT DCA FLOT TAD FLOAT# DCA FLOT# FLO2, NOP /CDF TO FIELD OF ARGUMENT TADI 7 JMP FLOTX / / INTEGER TO FLOATING POINT CONVERSION / FLOT, BLOCK 2 / CALL 0,FLOT FLOTX, CLL /ASSUMES INTEGER VARIABLE IN AC SPA CIA CML DCA MAC DCA HAC DCA LAC RAR DCA ACS TAD (217 DCA ACX DCA RSW JMS NORMAC RETRN FLOT / INDIRECT FLOATING POINT ADD CPAGE 36 IFAD, BLOCK 2 / CALL 1,IFAD TAD IFAD / ARG <2WORD ADDRESS> DCA IFA1 IFA1, NOP TADI IFAD# INC IFAD# DCA IFA2 CLA CMA TADI IFAD# INC IFAD# DCA 10 IFA2, NOP TADI 10 DCA 7 CLA CMA TADI 10 DCA 10 TAD IFAD DCA FAD TAD IFAD# DCA FAD# JMP FADENT ARS, 0 /LOCAL AC SHIFT RIGHT SUBROUTINE TAD HAC CLL RAR DCA HAC TAD MAC RAR DCA MAC TAD LAC RAR DCA LAC CLA RAL DCA RSW JMPI ARS FPER, 5726 0614 /"OVFL" ERROR CHS, BLOCK 2 /FLOATING POINT NEGATION TAD ACH / CALL 0,CHS SZA TAD (4000 CHSRET, DCA ACH RETRN CHS / / ERROR ROUTINES / ER0, 0 /CONTAINS ADDRESS OF CURRENT ENTRY PT ERR, CLA TAD I ER0 /BANK CALL IS FROM DCA CHS ISZ ER0 /INDEX TO ADDRESS TAD I ER0 /ADDRESS DCA CHS# CALL 1,ERROR ARG FPER CLA CLL CMA RAR JMP CHSRET END