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Add macro IS_NIL
author
Kim Nguyễn
<kn@lri.fr>
Tue, 14 Feb 2012 10:00:45 +0000
(11:00 +0100)
committer
Kim Nguyễn
<kn@lri.fr>
Tue, 14 Feb 2012 10:00:45 +0000
(11:00 +0100)
Testing whether a node is NIL with < 0 rather than == -1 allows
the compiler to know that a node is >= in subsequent code, thus
opening the door to more aggressive optimizations.
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