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Bit vectors are frequently used in compilers to represent sets of
integers, particularly for data flow analysis. The SUIF library
includes a bit_set class with an extensive collection of methods.
This class is implemented in the `bitset.h' and `bitset.cc'
files. When you create a new bit_set, you must specify the range
of integers which it may contain.
The bit_set_iter class provides an easy and efficient way to
iterate through the entries in a bit_set. This iterator is
slightly different than the SUIF list iterators. You must call the
is_empty method once before each call to the step method.
Other than that, it is straightforward.
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