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[]
> One example of this type of optimization
>that I remember was when copying two X registers (the machine's
>accumulators, more or less; they're 60-bit registers) into two
>other registers.  The obvious sequence is
>
>        BX1     X2+X2   bitwise "or" of X2 with X2 into X1
>        BX3     X4+X4   likewise for X4 into X3
>
>Redundant operatorands could be elided, so that the X2+X2 could be
>abbreviated by just using X2.
>
>[Ed Gould]

Just as a point of information, "BX1 X2+X2" and "BX1 X2", are not the
same instruction -- they generate different opcodes.  They do have the
same effect, though.

--
The above viewpoints are mine.  They are unrelated to
those of anyone else, including my cat and my employer.

Kenneth J. Montgomery  "Shredder-of-hapless-smurfs"
[Charter?] Member, Heathen and Atheist SCUM Alliance, "Heathen" division

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