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decus_20tap1_198111
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decus/20-0013/irand.mac
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TITLE IRAND INTEGER RANDOM NUMBER
SUBTTL V.001 R.S.TOMLINSON 19 AUG 68
ENTRY IRAND
INTERN IRAND
EXTERN RAND
; GET RANDOM INTEGER UNIFORMLY DISTRIBUTED BETWEEN TWO LIMITS
; CALL: JSA 16,IRAND
; ARG 00,<LOWER LIMIT>
; ARG 00,<UPPER LIMIT>
; RESULT IN AC 0
; Modified to PUSHJ/POPJ calling convention 11 Oct 1980
; by Paul T. Robinson, Wesleyan Univ. for DECUS conversion to DEC-20
; call: movei 16,[exp <lower limit>
; exp <upper limit>]
; pushj 17,irand
; result in ac0
IRAND: pushj 17,rand
LSH 0,-1
MOVE 1,@1(16)
SUB 1,@0(16)
AOS 1
MUL 0,1
ADD 0,@0(16)
popj 17,
END