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1 A(I)=B(I) is obviously parallel
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Fortran90 Array Notation
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A=B expresses this parallelism naturally in way compiler can easily detect in a deterministic way
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Do 1 I=1,N
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J=I
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K=I
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1 A(J)=B(K) is not so obviously parallel
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Needs a difficult to define (in general case) algorithm (especially if IF statements, i.e. conditionals, defining I,J) to decide on existence and implementation of parallelism
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Use of Fortran77 has "thrown away" natural parallelism at language level even though "run-time" restores as creates explicit values for variables such as J and K which are only known by analysis at compile time.
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