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When the "ob" option is specified, the code generator will try to order the
blocks of code emitted such that the "expected" execution path (as
determined by a set of simple heuristics) will be straight through, with
other cases being handled by jumps to separate blocks of code "out of line".
 This will result in better cache utilization on the Pentium.  If the
heuristics do not apply to your code, it could result in a performance
decrease.