Re: loops

Preston Briggs asks whether we should treat


do {
do {
<A>
} while ()
} while ()


as one loop or a nested pair.


Though intuition suggests that it is a pair, there is at least one
reason to treat it as one loop. Something like


while () {
switch () {
case foo:
...; break;
case bar:
...; break;
case baz:
...; break;
}


is otherwise very easy to mislabel as a triply-nested loop, if we
have already optimized the breaks into jumps back to the header.


When you run into a 100-ply switch statement that your compiler
calls a 100-deep nested loop, it really sticks with you, believe
me. Your hair -never- grows back.


David W. Wall - - - - - - - - - - - - - - - - wall@decwrl.dec.com
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