strength reduction and other optimizations

[Bill McEnaney]

Good advice, Ian.  Thanks.  I'm fanatical about readability and
efficiency.  But I normally don't micro-optimize when micro-optimiations
would decrease my code's readability.

Ian Lance Taylor wrote:

Unless your code is performance critical, you should write whatever
code will be easier for people to read and understand.  In the
relatively rare case that the code is performance critical, then you
should certainly do whatever generates the faster assembly code, and
revisit the issue whenever you run the program on a new computer.
 
gcc is able to both optimizations you mention, and it will do them,
when optimizing, when it is beneficial.

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