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425 lines
14 KiB
Fortran
425 lines
14 KiB
Fortran
C***********************************************************************
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C
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C SOMEWHERE.FOR
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C
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C D I S C L A I M E R N O T I C E
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C ------------------- -----------
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C
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C This document and/or portions of the material and data furnished
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C herewith, was developed under sponsorship of the U. S. Government.
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C Neither the U.S. nor the U.S.D.O.E., nor the Leland Stanford Junior
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C University, nor their employees, nor their respective contractors,
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C subcontractors, or their employees, makes any warranty, express or
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C implied, or assumes any liability or responsibility for accuracy,
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C completeness or usefulness of any information, apparatus, product
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C or process disclosed, or represents that its use will not infringe
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C privately-owned rights. Mention of any product, its manufacturer,
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C or suppliers shall not, nor is it intended to, imply approval, dis-
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C approval, or fitness for any particular use. The U. S. and the
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C University at all times retain the right to use and disseminate same
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C for any purpose whatsoever. Such distribution shall be made by the
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C National Energy Software Center at the Argonne National Laboratory
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C and only subject to the distributee furnishing satisfactory proof
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C that he has a valid license from the Intel Corporation in effect.
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C
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C
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C-----------------------------------------------------------------------
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C
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C This module of the PL/M-VAX compiler is the main workhorse for
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C code generation. It is invoked (recursively) to actually generate
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C code from a specified code tree, with the resulting value of the
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C code tree (if any) to be manifested in some desired place ('where').
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C
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C-----------------------------------------------------------------------
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C
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C R E V I S I O N H I S T O R Y
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C
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C 08SEP81 Alex Hunter 1. Temporarily disabled ref_count checking
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C for atoms. (V5.1)
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C 2. Fixed bug for procedure call when refct>1.
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C 15OCT81 Alex Hunter 1. Experimental version. (V5.4)
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C 23OCT81 Alex Hunter 1. Correct manifestation for OP_LOC. (V5.6)
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C 2. Improve choice of preferred register.
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C
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C***********************************************************************
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INTEGER*2 FUNCTION GET_SOMEWHERE(NODX,WHEREX)
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INCLUDE 'PLMCOM.FOR/NOLIST'
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CHARACTER*80 OPERAND,OPERAND1,OPERAND2
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C
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NOD=NODX
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WHERE=WHEREX
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IF (NOD.EQ.NULL) THEN
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GET_SOMEWHERE=NULL
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RETURN
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ENDIF
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IF (NODE_REG(NOD).NE.0) THEN
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REG=NODE_REG(NOD)
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NODE_TYPE(REG)=NODE_TYPE(NOD)
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GO TO 100
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ENDIF
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IF (LITERAL(NOD)) GO TO 50
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IF (CONSTANT(NOD)) GO TO 50
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IF (ATOM(NOD)) THEN
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CALL PUSH(NOD,1)
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CALL PUSH(WHERE,1)
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CALL MAKE_ADDRESSABLE(NOD)
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CALL POP(WHERE,1)
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CALL POP(NOD,1)
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CCCC IF (NODE_REFCT(NOD).GT.1) THEN ! (Temporarily disabled)
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CCCC REG=ALLOCATE_REG(NODE_TYPE(NOD))
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CCCC CALL EMIT_CODE(OP_ASSN,NOD,NULL,REG)
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CCCC NODE_REG(NOD)=REG
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CCCC NODE_TYPE(REG)=NODE_TYPE(NOD)
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CCCC GO TO 100
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CCCC ENDIF
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GO TO 50
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ENDIF
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C -- NODE MUST BE AN OPNODE.
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IF (OPNODE_OP(NOD).EQ.OP_MOV) THEN
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XX=GET_SOMEWHERE2(OPNODE_OPND1(NOD),OPNODE_OPND2(NOD))
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GET_SOMEWHERE=NULL
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RETURN
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ELSEIF (OPNODE_OP(NOD).EQ.OP_ASSN) THEN
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CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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IF (WHERE.GE.REG_MIN.AND.WHERE.LE.REG_MAX) THEN
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REG=GET_SOMEWHERE2(OPNODE_OPND1(NOD),WHERE)
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ELSE
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REG=GET_SOMEWHERE2(OPNODE_OPND1(NOD),ANY_REG)
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ENDIF
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NODE_TYPE(REG)=NODE_TYPE(NOD)
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CALL POP(NOD,1)
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CALL PUSH(NOD,1)
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CALL PUSH(REG,1)
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CALL MAKE_ADDRESSABLE(OPNODE_OPND2(NOD))
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CALL POP(REG,1)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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CALL EMIT_CODE(OP_ASSN,REG,NULL,OPNODE_OPND2(NOD))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_BASE(OPNODE_OPND2(NOD)))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_SUB(OPNODE_OPND2(NOD)))
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GO TO 100
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ELSEIF (OPNODE_OP(NOD).EQ.OP_CALL) THEN
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CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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NARGS=GET_SOMEWHERE2(OPNODE_OPND2(NOD),ON_STACK)
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CALL POP(NOD,1)
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CALL PUSH(NOD,1)
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CALL PUSH(NARGS,1)
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LOC1=GET_SOMEWHERE2(OPNODE_OPND1(NOD),ANY_WHERE)
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CALL POP(NARGS,1)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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OPERAND2=OPERAND(LOC1,N2)
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IF (OPERAND2(1:1).EQ.'(') THEN ! Indirect Call.
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OPERAND2='L^V.'//OPERAND2
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N2=N2+4
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ENDIF
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IF (MODEL.EQ.2 .OR. MODEL.EQ.4) THEN
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OPND1=MAKE_FIXED2(NARGS,S_LONG)
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OPERAND1=OPERAND(OPND1,N1)
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CALL EMIT('CALLS '//OPERAND1(:N1)//','//
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# OPERAND2(:N2))
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ELSEIF (NARGS.EQ.0) THEN
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CALL EMIT('CALLS #0,'//OPERAND2(:N2))
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ELSE
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CALL EMIT_CODE(OP_B2L,MAKE_FIXED2(NARGS,S_BYTE),NULL,
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# ON_STACK)
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CALL EMIT('CALLG (R10),'//OPERAND2(:N2))
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CALL EMIT_CODE(OP_ADD,MAKE_FIXED2((NARGS+1)*4,S_LONG),NULL,
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# 10)
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ENDIF
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NODE_TYPE(R0)=NODE_TYPE(NOD)
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IF (WHERE.EQ.ANY_WHERE .OR. WHERE.EQ.ANY_REG .OR.
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# NODE_REFCT(NOD).GT.1) THEN
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REG=ALLOCATE_REG(NODE_TYPE(NOD))
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CALL EMIT_CODE(OP_ASSN,R0,NULL,REG)
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NODE_REG(NOD)=REG
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NODE_TYPE(REG)=NODE_TYPE(NOD)
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GO TO 100
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ELSEIF (WHERE.EQ.ON_STACK) THEN
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CALL EMIT_CODE(OP_ASSN,R0,NULL,ON_STACK)
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CALL DECREMENT_VALUE_COUNTS(NOD)
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GET_SOMEWHERE=ON_STACK
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RETURN
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ELSEIF (WHERE.GE.REG_MIN .AND. WHERE.LE.REG_MAX) THEN
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IF (WHERE.NE.R0) THEN
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CALL EMIT_CODE(OP_ASSN,R0,NULL,WHERE)
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CALL DECREMENT_VALUE_COUNTS(NOD)
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ENDIF
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GET_SOMEWHERE=WHERE
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RETURN
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ELSE ! (WHERE IS ATOM)
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IF (ATOM_SUB(WHERE).EQ.NULL.AND.ATOM_BASE(WHERE).EQ.NULL)
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# THEN
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CALL EMIT_CODE(OP_ASSN,R0,NULL,WHERE)
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CALL DECREMENT_VALUE_COUNTS(NOD)
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GET_SOMEWHERE=WHERE
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RETURN
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ENDIF
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REG=ALLOCATE_REG(NODE_TYPE(NOD))
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CALL EMIT_CODE(OP_ASSN,R0,NULL,REG)
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NODE_REG(NOD)=REG
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NODE_TYPE(REG)=NODE_TYPE(NOD)
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GO TO 150
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ENDIF
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ELSEIF (OPNODE_OP(NOD).EQ.OP_ARG) THEN
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CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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XX=GET_SOMEWHERE2(OPNODE_OPND2(NOD),ON_STACK)
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CALL POP(NOD,1)
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CALL PUSH(NOD,1)
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NARGS=GET_SOMEWHERE2(OPNODE_OPND1(NOD),ON_STACK)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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GET_SOMEWHERE=NARGS+1
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RETURN
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ELSEIF ((OPNODE_OP(NOD).EQ.OP_ADWC.OR.OPNODE_OP(NOD).EQ.OP_SBWC)
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# .AND.OPNODE_OPND1(NOD).NE.WHERE) THEN
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CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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REG=GET_SOMEWHERE2(OPNODE_OPND1(NOD),ANY_REG)
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CALL POP(NOD,1)
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CALL PUSH(NOD,1)
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CALL PUSH(REG,1)
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LOC2=GET_SOMEWHERE2(OPNODE_OPND2(NOD),ANY_WHERE)
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CALL POP(REG,1)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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NODE_REG(OPNODE_OPND1(NOD))=0
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CALL EMIT_CODE(OPNODE_OP(NOD),LOC2,REG,REG)
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NODE_REG(NOD)=REG
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NODE_TYPE(REG)=NODE_TYPE(NOD)
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GO TO 100
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ENDIF
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IF (OPNODE_OP(NOD).EQ.OP_LOC) THEN
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LOC1=OPNODE_OPND1(NOD)
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LOC2=OPNODE_OPND2(NOD)
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CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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CALL PUSH(LOC1,1)
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CALL PUSH(LOC2,1)
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CALL MAKE_ADDRESSABLE(LOC1)
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CALL POP(LOC2,1)
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CALL PUSH(LOC2,1)
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CALL MAKE_ADDRESSABLE(LOC2)
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CALL POP(LOC2,1)
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CALL POP(LOC1,1)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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ELSE
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CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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LOC1=GET_SOMEWHERE2(OPNODE_OPND1(NOD),ANY_WHERE)
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CALL POP(NOD,1)
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CALL PUSH(NOD,1)
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CALL PUSH(LOC1,1)
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LOC2=GET_SOMEWHERE2(OPNODE_OPND2(NOD),ANY_WHERE)
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CALL POP(LOC1,1)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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ENDIF
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IF (OPNODE_OP(NOD).EQ.OP_THEN.OR.OPNODE_OP(NOD).EQ.OP_ALSO) THEN
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GET_SOMEWHERE=NULL
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RETURN
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ELSEIF (WHERE.EQ.ANY_WHERE .OR. WHERE.EQ.ANY_REG .OR.
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# NODE_REFCT(NOD).GT.1) THEN
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IF (OPNODE_OP(NOD).EQ.OP_LOC) THEN
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IF (ATOM(LOC1)) THEN
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_BASE(LOC1))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_SUB(LOC1))
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ENDIF
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ELSE
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CALL DECREMENT_VALUE_COUNTS(OPNODE_OPND1(NOD))
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CALL DECREMENT_VALUE_COUNTS(OPNODE_OPND2(NOD))
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ENDIF
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IF (REGISTER(LOC1)) THEN
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PREFERRED_REG=LOC1
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ELSE
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PREFERRED_REG=LOC2
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ENDIF
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REG=ALLOCATE_REG_WITH_PREFERENCE(NODE_TYPE(NOD),PREFERRED_REG)
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CALL EMIT_CODE(OPNODE_OP(NOD),LOC2,LOC1,REG)
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NODE_REG(NOD)=REG
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NODE_TYPE(REG)=NODE_TYPE(NOD)
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GO TO 100
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ELSEIF (WHERE.EQ.ON_STACK) THEN
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CALL EMIT_CODE(OPNODE_OP(NOD),LOC2,LOC1,ON_STACK)
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IF (OPNODE_OP(NOD).EQ.OP_LOC) THEN
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IF (ATOM(LOC1)) THEN
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_BASE(LOC1))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_SUB(LOC1))
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ENDIF
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ELSE
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CALL DECREMENT_VALUE_COUNTS(OPNODE_OPND1(NOD))
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CALL DECREMENT_VALUE_COUNTS(OPNODE_OPND2(NOD))
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ENDIF
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CALL DECREMENT_REFERENCE_COUNTS(NOD)
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GET_SOMEWHERE=ON_STACK
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RETURN
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ELSEIF (WHERE.GE.REG_MIN.AND.WHERE.LE.REG_MAX) THEN
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CALL EMIT_CODE(OPNODE_OP(NOD),LOC2,LOC1,WHERE)
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IF (OPNODE_OP(NOD).EQ.OP_LOC) THEN
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IF (ATOM(LOC1)) THEN
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_BASE(LOC1))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_SUB(LOC1))
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ENDIF
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ELSE
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CALL DECREMENT_VALUE_COUNTS(OPNODE_OPND1(NOD))
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CALL DECREMENT_VALUE_COUNTS(OPNODE_OPND2(NOD))
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ENDIF
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NODE_REG(NOD)=WHERE
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GET_SOMEWHERE=WHERE
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RETURN
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ELSE ! (WHERE IS ATOM)
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CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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CALL PUSH(LOC1,1)
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CALL PUSH(LOC2,1)
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CALL MAKE_ADDRESSABLE(WHERE)
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CALL POP(LOC2,1)
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CALL POP(LOC1,1)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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CALL EMIT_CODE(OPNODE_OP(NOD),LOC2,LOC1,WHERE)
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IF (OPNODE_OP(NOD).EQ.OP_LOC) THEN
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IF (ATOM(LOC1)) THEN
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_BASE(LOC1))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_SUB(LOC1))
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ENDIF
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ELSE
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CALL DECREMENT_VALUE_COUNTS(OPNODE_OPND1(NOD))
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CALL DECREMENT_VALUE_COUNTS(OPNODE_OPND2(NOD))
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ENDIF
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CALL DECREMENT_REFERENCE_COUNTS(NOD)
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_BASE(WHERE))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_SUB(WHERE))
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GET_SOMEWHERE=WHERE
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RETURN
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ENDIF
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C --- NODE IS ATOM OR LITERAL.
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50 IF (WHERE.EQ.ANY_WHERE) THEN
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GET_SOMEWHERE=NOD
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RETURN
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ELSEIF (WHERE.EQ.ANY_REG) THEN
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REG=ALLOCATE_REG(NODE_TYPE(NOD))
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CALL EMIT_CODE(OP_ASSN,NOD,NULL,REG)
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NODE_REG(NOD)=REG
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GET_SOMEWHERE=REG
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RETURN
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ELSEIF (WHERE.EQ.ON_STACK) THEN
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CALL EMIT_CODE(OP_ASSN,NOD,NULL,ON_STACK)
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CALL DECREMENT_VALUE_COUNTS(NOD)
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GET_SOMEWHERE=ON_STACK
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RETURN
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ELSEIF (WHERE.GE.REG_MIN.AND.WHERE.LE.REG_MAX) THEN
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CALL EMIT_CODE(OP_ASSN,NOD,NULL,WHERE)
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NODE_REG(NOD)=WHERE
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GET_SOMEWHERE=WHERE
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RETURN
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ELSE ! (WHERE IS ATOM)
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CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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CALL MAKE_ADDRESSABLE(WHERE)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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CALL EMIT_CODE(OP_ASSN,NOD,NULL,WHERE)
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CALL DECREMENT_VALUE_COUNTS(NOD)
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_BASE(WHERE))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_SUB(WHERE))
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GET_SOMEWHERE=WHERE
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RETURN
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ENDIF
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C --- VALUE OF NODE IS ALREADY IN REGISTER.
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100 IF (WHERE.EQ.ANY_WHERE .OR. WHERE.EQ.ANY_REG .OR.
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# WHERE.EQ.REG) THEN
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GET_SOMEWHERE=REG
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RETURN
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ELSEIF(WHERE.EQ.ON_STACK) THEN
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CALL EMIT_CODE(OP_ASSN,REG,NULL,ON_STACK)
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CALL DECREMENT_VALUE_COUNTS(NOD)
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GET_SOMEWHERE=ON_STACK
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RETURN
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ELSEIF (WHERE.GE.REG_MIN.AND.WHERE.LE.REG_MAX) THEN
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CALL EMIT_CODE(OP_ASSN,REG,NULL,WHERE)
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CALL DECREMENT_VALUE_COUNTS(NOD) ! ???
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GET_SOMEWHERE=WHERE
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RETURN
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ELSE ! (WHERE IS ATOM)
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150 CALL PUSH(WHERE,1)
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CALL PUSH(NOD,1)
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CALL PUSH(REG,1)
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CALL MAKE_ADDRESSABLE(WHERE)
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CALL POP(REG,1)
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CALL POP(NOD,1)
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CALL POP(WHERE,1)
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CALL EMIT_CODE(OP_ASSN,REG,NULL,WHERE)
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CALL DECREMENT_VALUE_COUNTS(NOD)
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_BASE(WHERE))
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CALL DECREMENT_REFERENCE_COUNTS(ATOM_SUB(WHERE))
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GET_SOMEWHERE=WHERE
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RETURN
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ENDIF
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END
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C--------------------------------------------------------------
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INTEGER*2 FUNCTION GET_SOMEWHERE2(NODX,WHEREX)
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IMPLICIT INTEGER*2 (A-Z)
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GET_SOMEWHERE2=GET_SOMEWHERE(NODX,WHEREX)
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RETURN
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END
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C--------------------------------------------------------------
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SUBROUTINE MAKE_ADDRESSABLE(ATMX)
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INCLUDE 'PLMCOM.FOR/NOLIST'
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ATM=ATMX
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IF (ATOM(ATM)) THEN
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CALL PUSH(ATM,1)
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BASEREG=GET_SOMEWHERE(ATOM_BASE(ATM),ANY_REG)
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CALL POP(ATM,1)
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XREG=GET_SOMEWHERE(ATOM_SUB(ATM),ANY_REG)
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ENDIF
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RETURN
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END
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