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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | C Copyright 1981-2016 ECMWF.
C
C This software is licensed under the terms of the Apache Licence
C Version 2.0 which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
C
C In applying this licence, ECMWF does not waive the privileges and immunities
C granted to it by virtue of its status as an intergovernmental organisation
C nor does it submit to any jurisdiction.
C
C
C STATEMENT FUNCTIONS TO MANIPULATE BITS IN WORDS OF 64 BITS
C
C DATA ONES/7777777777777777B/
C DATA OOOS/0B/
C
C 1. SINGLE BIT MANIPULATIONS
C
C 1.1 SET BIT KBIT IN WORD PW
C
IBSET(KW,KBIT)=OR(KW,SHIFT(1B,KBIT))
C
C 2. WORD MANIPULATIONS, BIT BY BIT
C
C 2.1 ARE WORDS PW1 AND PW2 EQUAL?
C
C LOGICAL NLEQAL
C NLEQAL(PW1,PW2)=(PW1.XOR.PW2).EQ.0B
C
C 2.2 BITWISE AND AND OR
C
IAND(K1,K2)=AND(K1,K2)
IOR (K1,K2)= OR(K1,K2)
C
C 2.3 BITWISE NEGATION
C
NOT(K)=COMPL(K)
C
C 2.4 SHIFT (LEFT FOR KSH POSITIVE, RIGHT FOR KSH NEGATIVE)
C
ISHFT(K,KSH)=CVMGP(SHIFTL(K,KSH),SHIFTR(K,-KSH),KSH)
C
C 3. SPECIAL PURPOSE
C
C 3.1 TAKE 4 LAST BITS OF KW, PUT THEM IN PW AT POS K*4-1
C
C SETLEV(PW,KW,K)=OR(AND(PW,SHIFT(0B.EQV.17B,K*4-4)),
C +SHIFT(AND(17B,KW),K*4-4))
C
C 3.2 EXTRACT FIELD K*4-1:4 FROM PW
C
C MGTLEV(PW,K)=AND(17B,SHIFT(PW,68-K*4))
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